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Name of the Trade – Electronic Mechanic 4th Semester – Module 1 : Fiber Optical Communication
# Question OPT A OPT B OPT C OPT D Ans Level Topic of syllabus Week No of the Syllabus
1 What is the standard range of optical fiber cable diameter in mm? 0.01 mm to 0.1 mm 0.1 mm to 0.2 mm 0.25 mm to 0.5 mm 0.5 mm to 1.5 mm C 1 Optical fiber 79
2 What is the full form of PPM? Push Pull Modulation Post Phase Modulation Para Phase Modulation Pulse Position Modulation D 1 Fiber optic communication 79
3 What is the wavelength of visible light spectrum? 200 to 250 nano meter 250 to 380 nano meter 380 to 750 nano meter 750 to 980 nano meter C 1 Fiber optic communication 79
4 What is the core diameter size of single mode optical fiber? 3.25 X 10³ inches 3.5 X 10-4 inches 3.5 X 10-6 inches 3.8 X 10-3 inches B 1 Losses in optical fiber 79
5 What is the name of part marked ‘X’ in the multi mode optical fiber cable?
Core Cladding Buffer jacket Strength member A 1 Encoding and decoding of light 79
6 What is the full form of OTDR? Optical Time Domain Resolves Optical Time Domain Reflectometer Optical Time Domain Reflector Optical Time Domain Refractor B 1 Fiber optic communication 79
7 Which colour is coated on the outer jacket of fiber optic cable to identify the single mode application? Red Orange Yellow Dark brown C 2 Encoding and decoding of light 79
8 What is the frequency of sine wave signal taken from function generator to use OFC trainer kit? 1 KHz 10 KHz 100 KHz 1 MHz A 2 Encoding and decoding of light 79
9 What is the name of the bouncing back effect of light rays from a shiny surface? Converging Diverging Reflection Refraction C 2 Encoding and decoding of light 79
10 Which parameter makes the fiber optic communication is the perfect choice for transmitting broad band signals? Lower line loss Wider bandwidth Low maintenance Environment immunity B 2 Pulse modulation techniques 79
11 What is the refractive index of vacuum? 1 Less than 1 Greater than 1 Infinity A 2 Optical fiber 79
12 What is the basis for the selection of LED or LASER diode as the light source in optical fiber communication? Amplitude Frequency Application Operating temperature C 2 Fiber optic communication 79
13 Which electronic device is used to convert the signal at receiving terminal of fiber optic communication channel? Opto coupler Opto isolator Photo detector Light emitting diode C 2 Fiber optic communication 79
14 Which light source is used to convert the electrical signal in the fiber optic communication? Opto coupler Photo diode Photo transistor Light emitting diode D 2 Encoding and decoding of light 79
15 Which method is used to transmit information by means of light pulses? Radio wave communication Copper wire communication Microwave communication Fiber optic communication D 2 Encoding and decoding of light 79
16 What is the name of optical fiber cable part marked ‘X’?
Core Cladding Buffer jacket Strength member C 2 Optical fiber 79
17 Which type of optical fiber is used to carry telephone and television signals? Single mode fiber Multi mode fiber Step index fiber Graded index fiber A 2 Optical fiber 79
18 Which equipment is necessary for the optical fiber cable servicing? Connectors OFC couplers Fusion splicer Multiplexing circuits C 2 Fiber optical splicing 79
19 Which mode the signal wave travels through the optical fiber? Transverse mode Length wise mode Straight on mode Unrestricted mode A 2 Fiber optical splicing 79
20 Which optical fibre is best suited for local area network applications? Single mode fiber Multi mode fiber Step index fiber Graded index fiber D 2 Fiber optical splicing 79
21 What type of joining technique is used for fiber optic cables? Fusion techniques Epoxy techniques Welding techniques Soldering techniques A 2 Fiber optical splicing 79
22 Which circuit is used for the wave guide dispersion? Sweep circuit Oscillator circuit Optical fiber circuit Demodulator circuit C 2 Fiber optical splicing 79
23 Which device is used as the light source for long distance and high data rate applications in fiber optic communication? PIN diode Photo diode Laser diode Light emitting diode C 2 Fiber optical splicing 79
24 Which device is used as the light source for short distance and low data rate applications in fiber optic communication? Tunnel diode Photo diode Schottky diode Light emitting diode D 2 Encoding and decoding of light 79
25 Which technology has replaced the copper wire in the core communication networks? Satellite communication Radio wave communication Micro wave communication Optical fiber communication D 2 Encoding and decoding of light 79
26 What is the effect on the angle of incidence of light is made greater than the critical angle? Light stops Reflection occurs Refraction occurs Light passes directly B 3 Pulse modulation techniques 79
27 What is the name of the loss occurring due to the bend of finite radius in the optical fiber cable? Luminance loss Dispersion loss Hysteresis loss Radiative loss D 3 Losses in optical fiber 79
28 Which loss is related to the fiber material used for optical communication? Absorption Dispersion Hysteresis loss Radiative loss A 3 Losses in optical fiber 79
Name of the Trade – Electronic Mechanic 4th Semester – Module 2 : Digital Panel Meter
# Question OPT A OPT B OPT C OPT D   Ans Level Topic of syllabus Week No of the Syllabus
1 What is the count range of 3 digit DPM? 0 – 100 0 – 999 0 – 1999 0 – 9999   B 1 Introduction of DPM 80-81
2 What is the name of digital electronic device marked ‘x’?
 
Amplifier Oscillator Modulator Multiplexer   D 1 Multiplexing IC 7106/7107 80-81
3 How many input lines are available in BCD to 7 segment decoder IC? Six Four Three Eight   B 1 Scrolling displays 80-81
4 Which type of seven segment display all the 8 anodes are left free? Common base type Common anode type Common emitter type Common cathode type   D 1 Scrolling displays 80-81
5 How the scaling down of the input is arranged in Voltage divider used Regulator circuit used Low pass filter circuit Frequency selective   A 2 Voltage 80-81
the Digital Panel Meter? used filter circuit used measurement
 
6 What is the function of the block marked ‘X’ in data selector circuit?
Amplifier Modulator Multiplexer Demultiplexer   D 2 Multiplexing IC 7106/7107 80-81
7 Which signal format is used in Digital Panel Meter to display the input information? Alpha format Analog format Numeric format Alphanumeric format   D 2 Display decoder/driver 80-81
 
 
8 What is the function of the 7 segment LED display system part marked ‘X’?

Driver Counter Flip flop Oscillator   A 2 Liquid crystal displays 80-81
9 Which IC is used on the BCD to 7 segment decoder in the display circuit? IC 7404 IC 7448 IC 7106 IC 7107   B 2 Scrolling displays 80-81
10 What is the function of transistor in the seven segment display circuit?

Regulate the voltage Decode input signal Amplify input current Convert binary into decimal format   C 2 Scrolling displays 80-81
11 Which device converts one type of digital format into another digital format? Display decoder Display driver Driver transistor Seven segment display   A 2 Display decoder/driver 80-81
12 How the sliding of the text is moved vertically on the desktop computer monitor display? By computer instructions Connecting potentiometer Scrolling wheel in the mouse Microprocessor based system   C 2 Liquid crystal displays 80-81
13 Which stage provides the required current to display the LED type seven segment display device? Driver Decoder Multiplexer Demultiplexer   A 2 Current measurement 80-81
14 How the pin number of seven segment display device is marked? Numbers Alphabets ASCII codes Alpha numeric codes   B 2 Liquid crystal displays 80-81
15 Which combination of segments are switched ON to display the digit 6 by the seven segment display? a, b, c, d and g a, b, d, e and g a, c, d, f and g a, c, d, e, f and g   D 2 Scrolling displays 80-81
16 How the seven segment display glows to display Forward biasing of Reverse biasing of Switch ON anode Switch ON cathode   A 2 Scrolling 80-81
the decimal numbers 0 to 9? segments segments supply supply   displays
 
 
17 What is the function of the resistor connected in the Digital Panel Meter circuit?
 
Shunt resistor Multiplier resistor Voltage divider resistor Current limiting resistor   C 2 Voltage measurement 80-81
18 What is the battery voltage rating of Digital Panel Meter marked ‘X’?

3 VDC 6 VDC 9 VDC 12 VDC   C 2 Voltage measurement 80-81
19 Which IC is used in the LCD digital panel meter? LM 2576 LM 2621 ICL 7106 MC 34063A   C 2 Multiplexing IC 7106/7107 80-81
20 Which type of seven segment display anodes of all the segments are connected together? Common Base type Common Anode type Common Cathode type Common Emitter type   B 2 Alpha numeric LED displays 80-81
21 What is the voltage drop across the shunt resistor for full scale range in 0 to -1A Digital Panel Meter? 50 millivolt 100 millivolt 200 millivolt 500 millivolt   C 2 Voltage measurement 80-81
22 What is the required current to glow the LED in each segment of seven segment display device? 10 mA 20 mA 50 mA 80 mA   B 2 Current measurement 80-81
23 Which IC is used to convert 4 bit binary coded decimal into 8 bit seven segment data? IC 7400 IC 7404 IC 7448 IC 7408   C 2 Display decoder/driver 80-81
24 Which mode is selected for operation to enable the read/write pin of LCD module kept at high level? Read mode Write mode Store mode Display mode   A 2 Liquid crystal displays 80-81
25 Which connection makes the individual segment Connect +5 VDC Connect +12 VDC Connect -12 VDC Connect to logic zero   D 2 Liquid crystal 80-81
in a common anode type 7 segment display displays
illuminated?
26 Which meter measures all input voltages scaled down in discrete steps to match the full count range? Analog multimeter Digital panel meter Moving iron meter Thermocouple meter   B 2 Scrolling displays 80-81
27 How many output lines are available in BCD to 7 segment decoder IC? Six Four Three Eight   D 2 Display decoder/driver 80-81
28 What causes the change in light angle passing through the molecules of liquid crystal display? Ambient light Electric current Change in temperature Acoustic pressure variations   B 3 Liquid crystal displays 80-81
 
 
Name of the Trade – Electronic Mechanic 4th Semester – Module 3 : SMPS and Inverter
# Question OPT A OPT B OPT C OPT D   Ans Level Topic of syllabus Week No of the Syllabus
1 What is the working principle of constant voltage transformer (CVT)? Ferro resonance Ferro magnetism Servo mechanism Electro mechanism   A 1 Switch mode power supply 82-84
2 Which type of circuit function is used in the SMPS?
Flyback converter Forward converter DC to AC converter AC to DC converter   D 1 DC to DC converter 82-84
3 Which mode of operation, the transformer is connected?
Low cut off mode High cut off mode Buck operation mode Boost operation mode   D 1 Inverter and principle of operation 82-84
4 Which part of the computer is connected by the 20/24 ATX connector from the SMPS unit? Mother board Hard disc drive CPU cooler fan DVD ROM / writer   A 1 SMPS used in PC 82-84
5 Which type of voltage stabilizer is in the block diagram?
Servo type Manual type Constant voltage type Automatic control type   D 1 Stabilizers 82-84
6 What is the name of the forward converter type SMPS? Boost converter Flyback converter Isolation converter DC to DC buck converter   D 1 SMPS & Inverter 82-84
7 Which electric component maintains constant output voltage in the power supply section marked ‘X’?
Rheostat Transistor Zener diode Potentiometer   C 1 SMPS & Inverter 82-84
8 What is the name of the static device that converts fixed DC input voltage into variable DC output? DC chopper Buck converter Boost converter AC link chopper   A 1 DC to DC converter 82-84
9 What is the output pin number of switching regulator IC LM 2576? Pin No.2 Pin No.3 Pin No.4 Pin No.5   A 1 Switch mode power supply 82-84
10 What is the operating frequency of linear power supply? 20 Hz to 25 Hz 50 Hz to 60 Hz 5 KHz to 10 KHz 15 KHz to 1 MHz   B 1 Switch mode power supply 82-84
11 What is the working voltage range of input AC supply specified for SMPS? 110 VAC to 150 VAC 170 VAC to 240 VAC 90 VAC to 270 VAC 220 VAC to 440 VAC   C 1 Switch mode power supply 82-84
12 What is the full form of CVT? Complex Virtual Technology Constant Voltage Transformer Composite Video Transmission Complementary Voltage Terminal   B 1 Switch mode power supply 82-84
13 Which type of transformer is used in the DC to AC converter? Auto transformer Step up transformer Isolation transformer Step down transformer   D 1 DC to DC converter 82-84
14 What is the type of converter?
Fly back converter DC to AC converter AC to DC converter Forward type converter   A 1 SMPS & Inverter 82-84
15 What is the frequency range of switching circuit in SMPS? 10 Hz to 15 KHz 15 KHz to 1 MHz 1 MHz to 3 MHz 3 MHz to 30 MHz   B 1 SMPS & Inverter 82-84
16 Which IC is used in the Pulse Width Modulation circuit of computer SMPS? TL 494 NE 555 UA 741 LM 2576   A 2 SMPS & Inverter 82-84
17 What is the efficiency of linear power supply? 30% – 40% 40% – 50% 50% – 60% 60% – 75%   A 2 SMPS & Inverter 82-84
18 Which power device is used for switching purpose in computer SMPS? SCR IGBT MOSFET Transistor   C 2 SMPS & Inverter 82-84
19 What is the name of servo voltage stabilizer Servo motor Motor power control Isolation transformer Toroidal auto   D 2 Stabilizers 82-84
part marked ‘X’?
transformer  
20 Which type of operation is performed by the circuit?
Linear regulation Boost operation Fly wheel operation Buck boost operation   C 2 DC to DC converter 82-84
21 Which mode of operation the transformer is connected?
Buck operation Boost operation Low cut off mode High cut off mode   A 2 DC to DC converter 82-84
22 What is the function of the transistor marked ‘X’ in the buck converter circuit?
Clipping Clamping Chopping Switching   D 2 DC to DC converter 82-84
23 What is the function of electronic circuit part marked ‘X’?
Sensor Comparator Servo amplifier Buck boost transformer   D 2 Switch mode power supply 82-84
24 What type of transformer is used in automatic Auto transformer Step up transformer Isolation transformer Step down transformer   A 2 Stabilizers 82-84
voltage stabilizer?
25 What is the function of series regulator IC 2576 pin No4?
Control AC input Feed back Frequency output   C 2 SMPS used in PC 82-84
26 What is the function of the circuit?
Sine wave inverter Servo voltage stabilizer Grid tied charge system Switched mode power supply   B 2 Switch mode power supply 82-84
27 Which type of connector is used to supply SATA connector Peripheral connector 20/24 Molex connector PCI express connector   C 2 SMPS used in PC 82-84
power from SMPS to the computer mother
board?
28 Which circuit is used in SMPS for voltage regulation? Clipping Clamping Switching Amplification   C 2 SMPS used in PC 82-84
29 What is the switching frequency of SMPS used in computer? 5 KHz 10 KHz 15 KHz 20 KHz   D 2 SMPS used in PC 82-84
30 What is the resultant output voltage of the circuit?
Inverted output Regulated output Adjustable output Unregulated output   B 2 SMPS & Inverter 82-84
31 Which circuit is provided in control section of Input filter circuit Opto isolator circuit Rectifier and filter Pulse width modulator   D 2 DC to DC converter 82-84
SMPS to drive the power switching transistor? circuit circuit  
32 Which type of core is used in the SMPS transformer? Air core Solid iron core Ferrite ceramic core Laminated magnetic core   C 2 Inverter and principle of operation 82-84
33 What is the function of opto-coupler in SMPS Controls the pulse Isolate the output Generates switching Stops RF interference   B 2 SMPS & Inverter 82-84
circuit? width section pulses signals  
34 Which transformer has common winding for both primary and secondary? Auto transformer Step up transformer Step down transformer Tapped primary transformer   A 2 Switch mode power supply 82-84
35 What is the continuous speed adjustment of output voltage correction in servo voltage stabilizers? 5 to 10V per second 10 to 15V per second 15 to 20V per second 20 to 40V per second   D 3 Stabilizers 82-84
36 Which section in SMPS adjust the duty cycle of switching to keep the output voltage constant? Power section Output section Protection circuit Pulse width modulator controller   D 3 Switch mode power supply 82-84
37 What is the purpose of the Metal Oxide Varistor connected across the AC supply terminals of SMPS? Regulates output Prevent overload Prevent surge voltage Prevent low input voltage   C 3 SMPS & Inverter 82-84
Name of the Trade – Electronic Mechanic 4th Semester – Module 4: UPS
# Question OPT A OPT B OPT C OPT D   Ans Level Topic of syllabus Week No of the Syllabus
1 What is the full form of UPS? Unlimited Power Supply Uninterrupted Power Supply Uprooted Power Supply Utility Power Supply   B 1 UPS 85-87
2 What is the name of the OFF line UPS section marked ’X’ ?
Digital Controller Battery Charger Load relay Voltage regulator   B 1 UPS working 85-87
3 Which type of mounting method is used in battery installation?
Tier mounting Rack mounting Shaft mounting Cabinet mounting   A 1 Installation of UPS 85-87
4 What is the type of UPS?
ON line UPS OFF line UPS Industrial type UPS Line interactive UPS   D 1 Installation of UPS 85-87
5 What is the name of the electronic circuit?
Amplifier Battery charger Multiplexer Full adder   B 1 UPS working 85-87
6 What is the range of specific gravity of lead acid battery, under discharged condition? 1.11 to 1.14 1.14 to 1.17 1.17 to 1.26 1.26 to 1.28   A 1 UPS working 85-87
7 What is the name of the instrument used for electrical insulation measurements? Megger Ammeter Voltmeter Energy meter   A 2 UPS 85-87
8 Which IC is used in the battery charging circuit of ON-Line UPS? LM 317 TL 494 NE 555 UA 741   A 2 UPS working 85-87
9 Which method of earth resistance measurement is experimented?
Two point method Four point method Three point method Single point method   C 2 UPS working 85-87
10 What is the ambient temperature maintained to extend the life of UPS? 10º C to 15º C 15º C to 25º C 25ºC to 30º C 30ºC to 35º C   B 2 UPS working 85-87
11 How batteries are rated? Volt Efficiency Ampere hour Wattage hour   C 2 UPS 85-87
12 Which technique is achieved by switching of the choppers in battery charging circuit? Constant voltage Constant current Constant frequency Constant power   B 2 UPS 85-87
13 What is the function of the circuit?
Skin effect Overload protection Alarm circuit Low voltage cut off   B 2 UPS 85-87
14 Which is equal to the ratio of the real power to the apparent power? Load factor Power factor Utility factor Optimize factor   B 2 UPS working 85-87
15 Which type of battery mounting method is used for battery installation? Tier mounting Shelf mounting Cabinet mounting Table mounting   B 2 Installation of UPS 85-87
16 Which type of operation is done by the battery charger circuit?
Fast charging Flash charging Trickle charging WiFi charging   C 2 Maintenance of batteries in inverter 85-87
17 What is the function of preset R5  in the Prevents power Provides correct Provides correct Reduces the battery   C 2 UPS working 85-87
circuit?
disturbances charging current for charging voltage for voltage
battery battery
18 Which test is conducted through the experiment?
Measure soil ratio Measure soil resistivity Measure earth vibration Measure earth resistance   D 3 UPS earthing 85-87
19 Which action causes damage to the battery? Over charging Trickle charging Electrolyte level higher Constant voltage charging   A 3 Maintenance of batteries in inverter 85-87
Name of the Trade – Electronic Mechanic 4th Semester – Module 5 : Solar Power (Renewable Energy System)
# Question OPT A OPT B OPT C OPT D Question   Level Topic of syllabus Week No of the Syllabus
1 Which type of conversion process takes place through the circuit?
Chemical energy into electrical energy Solar energy into electrical energy Wind energy into electrical energy Tidal energy into electrical energy सͩक[ ट के माÚयम से ͩकस Ĥकार कȧ
Ǿपांतरण ĤͩĐया कȧ गई है?
  1 Energy sources 88-90
2 Which material converts the light energy into electricity? LED Converter Solar cells Photo diode कौन सी सामĒी Ĥकाश ऊजा[ को ǒबजलȣ मɅ
ǐरवǓतत[  करती है?
  1 Solar cells 88-90
3 Which type of energy generation produces air pollution? Wind energy Hydel power Conventional energy Non- conventional energy ͩकस Ĥकार के ऊजा[ उ×पादन से वायु Ĥदषण
पैदा होता है?
  1 Energy sources 88-90
4 What is the full form of TFSC? Thin Film Solar Cell Thick Film Solar Cell Thermal Fast Switching Cell Twisted Film Silicon Cell TFSC ा पूण Ǿप Èया है?   1 Solar electric system 88-90
5 Which PV cells are the most common in use for solar electric system? Indium PV cells Germanium PV cells Phosphorus PV cells Crystalline silicon PV cells सौर ͪवɮयुत Ĥणालȣ के ͧलए कौन सी PV
सैãस सबसे आम हɇ?
  1 Solar electric system 88-90
6 What is the name of the block marked ‘X’ in the grid tied system?
Silicon Geothermal Amorphous Utility supply ͬĒड टाईड ͧसèटम मɅ ’X’ के Ǿप मɅ ͬचिéनत
Þलॉक का नाम Èया है?
  1 Solar electric system 88-90
7 What is the name of the SPV system?
Hybrid system Standalone system Interactive system Grid connected system SPV Ĥणालȣ का नाम Èया है?   1 SPV system and solar charge controller 88-90
8 Which formula is used to find the size of PV module in Watt-peak (WP)? DailyenergyConsumptni EfficiencyInsulation o  Daily energyConsumption Insulation´ Efficiency     Insulation´ Efficiency      Daily energy Consumption DailyenergyConsumption Efficiency+Insulation वाटपीक (WP) मɅ PV मॉɬयूल के आकार
को खोजने के ͧलए ͩकस सूğ का उपयोग
ͩकया जाता है?
  1 SPV system and solar charge controller 88-90
9 What is the name of the device marked ‘X’?
Loads Battery Inverter Charge controller ’X’ ͬचिéनत ͫडवाइस का नाम Èया है?   1 SPV system and solar charge controller 88-90
10 What is the full form of MPPT? Maximum Power Point Tracking Maximum Pulse Point Tracking Maximum Proper Polarity Tracking Maximum Power Protection Tracking MPPT ा फु ल फॉम[ Èया है?   1 SPV system and solar charge controller 88-90
11 What is the type of Solar Photo Voltaic (SPV) electric system?
Hybrid system Biohybrid system Standalone system Grid connected system सौर फोटो वोिãटक (SPV) ͪवɮयुत Ĥणालȣ
ा Ĥकार Èया है?
  1 Solar electric system 88-90
12 What is the name of the solar electric system block marked ’X’?
Cell Array Board Module X’ ͬचिéनत सौर ͪवɮयुत Ĥणालȣ Þलॉक का
ाम Èया है?
  1 Solar electric system 88-90
13 Which energy is converted from sunlight by the photovoltaic material? Kinetic energy Thermal energy Electrical energy Mechanical energy फोटोवोिãटक सामĒी ɮवारा ͩकस ऊजा[ को
ूय[ के Ĥकाश से पǐरवǓतत[  ͩकया जाता है?
  2 Solar electric system 88-90
14 What is the advantage of solar electric system? Uses lot of space Simple circuit design Renewable energy source Produces harmonic distortions सौर ͪवɮयुत Ĥणालȣ का लाभ Èया है?   2 Solar electric system 88-90
15 What is the purpose of making hybrid solar Withstand heat Long life Produce more Generate maximum अमोफȾस और मोनो ͩĐèटलȣय कोͧशकाओं   2 Solar cells 88-90
panels from a mix of amorphous and mono voltage efficiency के ͧमĮण से हाइǒĦड सौर पैनल बनाने का
crystalline cells? Ƨेæय Èया है?
16 Which material is coated as a thin layer on the Silicon dioxide Silicon monoxide Gallium phosphide Gallium Indium कौन सा सामĒी PV कोͧशकाओं पर एक   2 Solar cells 88-90
PV cells to reduce surface reflection? Nitride पतलȣ परत सतह ĤǓतǒबबं  को कम करने के
Ǿप मɅ लेͪपत है?
17 What is the standard test conditions for the sizing of PV module? 500 watts per square meter 1000 watts per square meter 2000 watts per square meter 4000 watts per square meter PV मॉɬयूल के आकार के ͧलए मानक
परȣ¢ण कȧ िèथǓत Èया है?
  2 Solar cells 88-90
18 Which type of voltage is available across the output terminals of the circuit?
Inverted output Rectified output Regulated output Converted output सͩक[ ट के आउटपुट टͧमन[ लɉ मɅ ͩकस Ĥकार
ा वोãटेज उपलÞध है?
  2 Solar cells 88-90
19 What is the drawback of off-gird system in solar Uses a lot of space System to work Lack of storage unit Various losses सौर ͪवɮयुत शिÈत मɅ ऑफͬĒड Ĥणालȣ कȧ   2 Solar electric 88-90
electric power? optimally associated ामी Èया है? system
20 Which system is designed to operate in parallel Off- grid system Grid tied system Specific load system Higher capacity ͪवɮयुत उपयोͬगता ͬĒड के समानांतर और   2 Solar electric 88-90
and interconnected with the electric utility grid? utility system आपस मɅ संचाͧलत होने के ͧलए कौन सी system
Ĥणालȣ तैयार कȧ गई है?
21 Which device limits the voltage and charging of battery in solar electric system? Inverter Regulator Multiplexer Charge controller सौर ͪवɮयुत Ĥणालȣ मɅ कौन सा उपकरण
ोãटेज और बैटरȣ कȧ चािजगɍ  को सीͧमत करता है?
  2 SPV system and solar charge controller 88-90
22 What is the function of the block marked ‘X’ in the grid connected system?
MPPT Battery DC Load AC Load ͬĒड से जुड़ ͧसèटम मɅ ’X’ के Ǿप मɅ
ͬचिéनत Þलॉक का काय[ Èया है?
  2 SPV system and solar charge controller 88-90
23 What is the type of solar photovoltaic (SPV) electric system?
Hybrid system Biohybrid system Standalone system Grid connected system सौर फोटोवोिãटक (SPV) ͪवɮयुत Ĥणालȣ
ा Ĥकार Èया है?
  2 SPV system and solar charge controller 88-90
24 What is the purpose of photovoltaic cell? Generate voltage Generate voltage Generate voltage Generate voltage ोटोवोिãटक सेल का उƧेæय Èया है?   2 Solar cells 88-90
from tidal power from sunlight from dynamo from wind power
 
25 What is the function of the part marked ‘X’ in the electric system?
Battery Solar panels Charge controller Comparator ͪवɮयुत Ĥणालȣ मɅ ’X’ के Ǿप मɅ ͬचिéनत
भाग का काय[ Èया है?
  2 Solar electric system 88-90
26 What is the efficiency of monocrystalline? Low High 100% Medium मोनोͩĐèटलाइन कȧ द¢ता Èया है?   2 Solar electric system 88-90
Name of the Trade – Electronic Mechanic 4th Semester – Module 6 : Cell Phones
# Question OPT A OPT B OPT C OPT D Question   Level Topic of syllabus Week No of the Syllabus
1 What is the full form of IMEI? International Mobile Enhanced Identity Integrated Mobile Equipment Identity International Mobile Equipment Identity International Message Enhanced Identity IMEI ा फु ल फॉम[ Èया है?   1 Mobile communication 91-92
2 What is the full form of FDD? Frequency Data Duplexing Frequency Division Duplexing Frequency Digital Duplexing Frequency Delay Duplexing FDD ा पूण Ǿप Èया है?   1 Cellular network 91-92
3 What is the full form of EMS? Enhanced Message Service Enhanced Mobile Service Enhanced Modular Service Enhanced Multimedia Service EMS ा पूण Ǿप Èया है?   1 Cellular network 91-92
4 What is the full form of NSS used in GSM architecture? Network Station Subsystem Network Switching Subsystem Network Support Subsystem Network Service Subsystem GSM आͩक[ टेÈचर मɅ Ĥयोग जाने वाले NSS का
ु ल फॉम[ Èया है?
  1 Cellular network 91-92
5 Which video format is used in Multimedia? MP3 WAV JPEG MPEG-1 मãटȣमीͫडया मɅ ͩकस वीͫडयो ĤाǾप का उपयोग
ͩकया जाता है?
  2 Data transfer 91-92
6 What is the advantage of CDMA communication system? Less secrecy Most accessible Improved call quality Multiple frequency band CDMA संचार Ĥणालȣ का लाभ Èया है?   2 Current technology 91-92
7 Which section converts the narrowband signal into wideband signal in CDMA mobile communication? Antenna Spreader Code generator Vocoder CDMA मोबाइल संचार मɅ कौन सा खडं  संके तन
संके त को वाइडबडɇ  संके त मɅ पǐरवǓतत[  करता है?
  2 Current technology 91-92
8 Which method is used to reduce the effects of burst error in CDMA system? Interleaving method Interlacing method Interconnecting method Inter looping method CDMA Ĥणालȣ मɅ Ħèट ğǑु ट के Ĥभावɉ को कम
करने के ͧलए ͩकस पƨǓत का उपयोग ͩकया जाता है?
  2 Current technology 91-92
9 Which feature supports audio messages from callers in cell phone communication? Voice record Voice mail Voice dial Caller id सेल फोन संचार मɅ कॉलस[ से ऑͫडयो संदेश ͩकस
ुͪवधा को सपोट[ करता है?
  2 Mobile communication 91-92
10 Which circuit uses frequency hopping technique? Satellite Military Aeronautical Oceanography कौन सी सͩक[ ट आविृ ×त होͪपगं  तकनीक का
पयोग करती है?
  2 Current technology 91-92
11 What is the purpose of encoder in CDMA To reduce bandwidth To manage RF To build redundancy To manage the CDMA Ĥणालȣ मɅ एनकोडर का उƧेæय Èया है?   2 Advanced features 91-92
system? transmission into the signal switching function
12 Which system supports the maintenance of GSM network? Base station subsystem Network switching system Operational support system Mobile telephone switching system कौन सी Ĥणालȣ GSM नेटवक[ के रखरखाव को
सपोट[ करती है?
  2 Advanced features 91-92
13 How the geographical area under one base station with a single transmitter and receiver is referred? Cell Cluster Cell site Honey comb एक Ěांसमीटर और ǐरसीवर के साथ एक बेस
èटेशन के तहत भौगोͧलक ¢ेğ को कै से संदͧभत[
ͩकया जाता है?
  2 Mobile communication 91-92
14 What is represented by the third group of codes in the IMEI number GG-000033-792410- 8 used in cell phones? Counter code Serial number Model number Network code सेल फोन मɅ इèतेमाल होने वाले IMEI नंबर GG-
000033-792410-8 Ʌ कोड के  तीसरे समूह ɮवारा Èया दशा[या गया है?
  2 Data transfer 91-92
15 What is the full form of LTE used in mobile communication? Long Term Evolution Level Test Equipment Low Transmission Equipment Layer Terminology Enhancement मोबाइल संचार मɅ ĤयुÈत LTE ा पूण Ǿप Èया है?   2 Data transfer 91-92
16 What is the temperature setting in soldering station to service the water damaged mobile phone? 150° C 250° C 350° C 450° C पानी से ¢ǓतĒèत मोबाइल फोन कȧ मुरमत के
ͧलए टांका लगाने वाले èटेशन मɅ तापमान सेǑटगं Èया है?
  2 Data transfer 91-92
17 Which lock prevents the operation of mobile phone by the user? SIM lock IMEI lock Keypad lock Software lock कौन सा लॉक उपयोगकता[ ɮवारा मोबाइल फोन का
संचालन रोकता है?
  2 Mobile communication 91-92
18 Which code is marked by the first two digit in the IMEI number of cell phone? Serial code Model code Country code Network code सेल फोन के IMEI नंबर मɅ पहले दो अकं ɉ से कौन
सा कोड अͩं कत होता है?
  2 Data transfer 91-92
19 Which device is used to correct the corrupted Universal file storage Utility function Universal flash Unlocking flash सेल फोन मɅ दͪू षत/कर[Üटेड  सॉÝटवेयर को ठȤक   2 Cellular network 91-92
software in cell phone? storage storage storage करने के ͧलए ͩकस उपकरण का उपयोग ͩकया
ाता है?
20 What is the purpose of IMEI number in cell Access network Protect data security Recognize the Identify the specific सेल फोन मɅ IMEI नंबर का उƧेæय Èया है?   2 Advanced features 91-92
phone? memory device
21 Which technology allows compatible devices to access data from the computer network? IR Technology Wireless fidelity Global positioning PowerPoint tracking कौन सी तकनीक कं Üयूटर नेटवक[ से संगत
पकरणɉ को डटे ा एÈसेस करने कȧ अनुमǓत देती है?
  2 Advanced features 91-92
22 Which frequency band is licence free for bluetooth and Wi-Fi users? 1.2 GHz 2.4 GHz 4.3 GHz 5.1 GHz Þलूटू थ और वाईफाई उपयोगकता[ओं के ͧलए कौन
सा ĥȧÈवɅसी बडɇ  लाइसɅस मुÈत है?
  2 Advanced features 91-92
23 What is the name of one or more solar panels put together on a rack facing the sun in solar electric system? Cells Module Arrays Photovoltaic module सौर ͪवɮयुत Ĥणालȣ मɅ सूरज का सामना कर रहे
एक रैक पर एक या एक से अͬधक सौर पैनलɉ का नाम Èया है?
  2 Cellular network 91-92
24 Which wireless technology link is used for Barcode Bluetooth Infrared rays Mobile virtual network मोबाइल फोन डटे ा Ěांसफर के ͧलए ͩकस वायरलेस   3 Mobile 91-92
mobile phone data transfer? ेÈनोलॉजी ͧलकं   का उपयोग ͩकया जाता है? communication
25 Which device safeguards from electrical shock in the event of short circuit? Pre amplifier Surge protector Solar resistant Charge controller शॉट[ सͩक[ ट कȧ िèथǓत मɅ कौन सा उपकरण ǒबजलȣ
े झटके से बचाता है?
  3 Mobile communication 91-92
Name of the Trade – Electronic Mechanic 4th Semester – Module 7 : LED Lights
# Question OPT A OPT B OPT C OPT D   Level Topic of the syllabus Week No of the Syllabus
1 Which bulb changes the colour due to age and ambient temperature? LED Bulb Fluorescent lamp Incandescent lamp Sodium vapour lamp   1 Types of LED 93-94
2 What is the range of power density of LED? 200 W /cm2 300 W /cm2 400 W /cm2 500 W /cm2   1 LED efficiencies 93-94
3 What is the rate of light transmission of acrylic diffuser plate? 82% 88% 92% 98%   1 Types of LED lights 93-94
4 Which IC is marked ‘x’ in LED driver circuit?
IC 741 IC 555 LM 723 LM 317   1 LED drives 93-94
5 Which factor increase the performance of LED light? Ferroresonance Customization Utility factor Thermal management   1 LED efficiencies 93-94
6 What is the full form of COB? Chip on Board Circuit on Board Connection on Board Capacitor on Board   1 Introduction of LED lights 93-94
7 What is the name of the component marked ‘x’ in the LED circuit?
SMD stack PTC component Non polar capacitor Electrolytic capacitor   1 LED stocks 93-94
8 What is the range of current rating for LED? 1mA to 2mA 2mA to 20mA 20mA to 30mA 30mA to 40mA   1 LED efficiencies 93-94
9 What is the range of rated voltage for LED? 0.5 to 1.6 VDC 1.6 to 4.2 VDC 4.2 to 5.6 VDC 5.6 to 6.8 VDC   1 LED efficiencies 93-94
10 Which semiconductor material is used to produce the blue colour LED? Gallium nitride Silicon carbide Gallium phosphide Gallium Arsenide   1 LED stocks 93-94
11 What is the specification of LED light? S/N ratio Amplification factor Power rating Resonance frequency   1 Types of LED lights 93-94
12 Which function is performed by the transistor in the LED light circuit? Mixer Driver Inverter Chopper   2 Types of LED lights 93-94
13 What is the function of the non-polar capacitor in the LED circuit?
Stops RF interference Smoothens DC supply Couples DC supply Couples AC supply   2 Types of LED 93-94
14 Which circuit is used to supply rated low Rectifier circuit Regulator circuit Driver circuit Over load protection   2 LED stocks 93-94
voltage DC and protect the LED light from circuit
fluctuations?
15 What is the advantage of LED? Short life spans Flickering effect High voltage operation Low power consumption   2 LED stocks 93-94
16 What is the purpose of 82 Ω, resistors in the
circuit?
Provide efficiency Reverse current flow Increase light intensity Limiting the load current   2 LED efficiencies 93-94
17 How to improve the lifespan of high power LEDs? Reduce the conduction time Remove excess heat from light Dissipate some amount of energy Increase the size and shape of light   2 LED efficiencies 93-94
18 What is termed as group of LEDs connected in circuits? Driving Stacking Combination Multiplexing   2 LED efficiencies 93-94
19 Which component operates at low temperature? LED Light Incandescent lamp Fluorescent lamp Sodium vapour lamp   2 LED efficiencies 93-94
20 What is the meaning of directional light source? Emit light to long distance Emit light in a specific direction Emit light in a reverse direction Emit light to all the direction   2 Types of LED 93-94
21 Which colour light is emitted by the LED using gallium indium nitride with wavelength of 450 nanometer? Red Blue Green White   2 Types of LED lights 93-94
22 Which colour is produced by the semiconductor material Aluminium Gallium Phosphide (AlGaP) in LED? Red Blue Green Yellow   2 Types of LED lights 93-94
23 What is the value of series resistor (Rs) connected to limit the load current to 10mA?
120 Ω 130 Ω 140 Ω 150 Ω   2 LED stocks 93-94
24 What is the switching speed of LED light to reach full brightness, compared to other light sources? 10 times faster 50 times faster 100 times faster 150 times faster   2 LED drives 93-94
25 What is the condition for glowing LED? Forward biased Reverse biased Zener breakdown Avalanche breakdown   2 Types of LED 93-94
26 What is the efficiency level of incandescent lamp? 5% 9% 12% 15%   2 LED efficiencies 93-94
27 What is the function of the NTC component used in the LED light control? Reduce noise Decreases voltage Limits surge current Controls temperature   3 Types of LED lights 93-94
28 How much power is consumed by a high power LED? 100 milliwatt 150 milliwatt 250 milliwatt 350 milliwatt   3 LED drives 93-94
29 Which electronic component is used to convert current into light, with forward biased condition? FET LED CFT UJT   3 Types of LED lights 93-94
30 What is the name of the diode used in emergency light to prevent the reverse flow of battery charge? Tunnel diode Zener diode Varactor indicator Free wheeling diode   3 Introduction of LED lights 93-94
Name of the Trade – Electronic Mechanic 4th Semester – Module 8 : LCD TV
# Question OPT A OPT B OPT C OPT D   Ans Level Topic of syllabus Week No of the Syllabus
1 What is the characteristic of transmitting Minimise distortion Detect video signal Converts picture into Radiates   D 1 TV transmitter 95-97
antenna in TV broadcasting? image electromagnetic waves receiver
 
2 What is the full form of PAL? Peak Alternating Line Pulse Alternating Line Phase Alternating Line Primary Alternating Line   C 1 TV transmitter receiver 95-97
3 Which parameter is related to power loss in electronic circuit? Modulation Attenuation Decoupling Amplification   B 1 TV transmitter receiver 95-97
4 What is the full form of NTSC? National Television Selection Committee National Television Service Committee National Television System Committee National Television Section Committee   C 1 Scanning, band width 95-97
5 What is the name of LED monitor part marked ‘X’?
Colour filter Horizontal filter Vertical filter Crystal molecule   D 1 Colour TV system 95-97
6 What is the full form of HPT? High Power Transformer High Power Terminal High Power Transmitter High Power Transistor   C 1 Colour TV system 95-97
7 Which term is related to the information about hue and saturation of a colour? Luminance Chrominance Resonance Ferroresonance   B 2 Colour TV system 95-97
8 What is the function of the block diagram?
Satellite link system FM transmission system B/W TV broadcasting system Colour TV broadcasting system   C 2 Working of LCD 95-97
9 What is the disadvantage of TN display? Ghosting effects Wide viewing angle Faster battery drain Low quality colour reproduction   D 2 Types of LCD 95-97
10 What is the bandwidth used for TV transmission in India? 5 MHz 6 MHz 7 MHz 8 MHz   C 2 Working of LCD 95-97
11 What is the range of frequencies covered under S-Band used for TV signal transmission? 41 MHz to 68 MHz 88 MHz to 104 MHz 104 MHz to 174 MHz 174 MHz to 230 MHz   C 2 Scanning, band width 95-97
12 Which signal is processed from R-Y and B-Y signals in colour TV receiver? Luminance signal Chrominance signal Equalising pulse signal Composite video signal   B 2 Working of LCD 95-97
13 Which function is performed by the section marked ‘X’ in the TV receiver?
RF amplifier VIF section FM detector Sync and scanning   D 2 TV transmitter receiver 95-97
14 What is the inter carrier signal in PAL system for TV transmission? 2.5 MHz 3.5 MHz 4.5 MHz 5.5 MHz   D 2 TV transmitter receiver 95-97
15 What is the function of tuner in TV receiver? Allows ghost image Allows adjacent Select the desired Modulated RF signal   C 2 TV transmitter 95-97
signal channel signal channel signal with audio signal receiver
16 What is the name of the dismantled LCD monitor display part marked ‘X’?
Fresnel lens Light filter plates Colour filter plates Polarised glass plates   D 2 Block diagram of LCD TV 95-97
17 What is the sub carrier frequency used in PAL standard for modulating colour difference signals? 2.30 MHz 3.58 MHz 4.43 MHz 5.50 MHz   C 2 Colour TV system 95-97
18 Which is represented by saturation in colour TV signal characteristics? Purity of a colour Amount of light intensity Seven colours of rainbow Frequency and amplitude   A 2 Colour TV system 95-97
19 What is the function of the block marked ‘X’ in the TV receiver?
Video section Sound section Filter section Tuner section   B 2 Working of LCD 95-97
20 How many odd fields are scanned in one second by the vertical sweep circuit in TV receiver? 25 50 625 15625   A 2 TV transmitter receiver 95-97
21 Which transmission technique produces the SSB transmission DSB transmission Vestigial side band Frequency shift keying   C 2 Scanning, band 95-97
waveform with lower side band suppressed for transmission transmission width
the carrier of TV signal?
22 Which scanning method is used in TV receiver with 625 lines? Interlaced scanning Document scanning Ultrasound scanning Progressive scanning   A 2 Block diagram of LCD TV 95-97
23 What is included in chrominance signal? Inter carrier signal Luminance signal Colour information Composite video signal   C 2 Colour TV system 95-97
24 Which In- plane switching technology is used in LCD panels for improved contrast ratio? Super TFT Super IPS Enhanced IPS Horizontal IPS   D 2 Types of LCD 95-97
25 What is the ratio of primary colours mixing to produce luminance (Y) signal? 15% Red + 25% Green
+ 60% Blue
20% Red + 30% Green
+ 50% Blue
30% Red + 59% Green
+ 11% Blue
40% Red + 45% Green
+ 15% Blue
  C 2 Colour TV system 95-97
26 What is the bandwidth for SECAM system based on 625 lines? 7 MHz 9 MHz 10 MHz 12 MHz   B 2 Colour TV system 95-97
27 What is the full form of LPT? Low Process Transmission Low Power Transmission Low Power Television Low Profile Telecasting   B 2 Block diagram of LCD TV 95-97
28 What is the bandwidth of PAL- D system of TV transmission? 5 MHz 6 MHz 7 MHz 8 MHz   C 2 Scanning, band width 95-97
29 Which colour is produced by the additive
mixing process of Red with Green in colour TV?
Cyan White Yellow Magenta   C 2 Colour TV system 95-97
30 How much service area is covered by a low power TV signal transmitter? 10 Km radius 20 Km radius 25 Km radius 50 Km radius   B 3 TV transmitter receiver 95-97
Name of the Trade – Electronic Mechanic 4th Semester – Module 9: LED TV
# Question OPT A OPT B OPT C OPT D Question   Ans Level Topic of syllabus Week No of the Syllabus
1 What is the input frequency range of the set-top box used for cable TV application? 47 MHz to 86 MHz 88 MHz to108 MHz 110 MHz to 862
MHz
880 MHz to 2150
MHz
के बल TV एिÜलके शन के ͧलए उपयोग ͩकए जाने
वाले सेट-ॉप बॉÈस कȧ इनपुट आविृ ×त रɅज Èया है?
  C 1 Satellite transmitter and receiver 98-99
2 Which material is used as cathode in OLED? Calcium Zinc oxide Selenium sulphide Indium tin oxide OLED मɅ कै थोड के  Ǿप मɅ ͩकस सामĒी का
उपयोग ͩकया जाता है?
  A 1 OLED TV 98-99
3 What is the limitation of OLED used in TV display? Short life span Slow response time Narrow viewing angle High power consumption TV ͫडèÜले मɅ उपयोग कȧ जाने वालȣ OLED कȧ
सीमा Èया है?
  A 1 OLED TV 98-99
4 Which material is used as anode in OLED TV display? Aluminium oxide Indium tin oxide Calcium oxide Zinc oxide OLED TV ͫडèÜले मɅ एनोड के Ǿप मɅ ͩकस
सामĒी का उपयोग ͩकया जाता है?
  B 1 OLED TV 98-99
5 Which layer is negatively charged in OLED TV display? Thermal layer Control layer Emissive layer Conductive layer OLED TV ͫडèÜले मɅ ͩकस परत को
नकारा×मक Ǿप से चाज[ ͩकया जाता है?
  C 1 OLED TV 98-99
6 Which layer is positively charged in OLED TV display? Thermal layer Control layer Emissive layer Conductive layer OLED TV ͫडèÜले मɅ ͩकस लेयर को
पॉिजǑटवलȣ चाज[ ͩकया जाता है?
  D 1 OLED TV 98-99
7 What is the full form of HDMI? High Digital Media Interface High Definition Multimedia Interface High Display Multimedia Interface Horizontal Display Multimedia Interface HDMI ा फु ल फॉम[ Èया है?   B 1 Working of LED TV 98-99
8 Which cable is used to connect LED TV and media device?
USB Cable RCA Cable HDMI Cable Optical Cable LED TV और मीͫडया ͫडवाइस को जोड़ने के
ͧलए ͩकस के बल का उपयोग ͩकया जाता है?
  C 1 Cables used in LED TV 98-99
9 What is the name of the connector part marked ‘X’?

DVI connector DB9 connector HDMI connector 15 pin VGA male connector X’ ͬचिéनत कनेÈटर के भाग का Èया नाम है?   D 1 Cables used in LED TV 98-99
 
10 What is the name of the adapter used to interconnect a computer system? VGA adapter DVI to RCA adapter DVI to HDMI adapter DVI to VGA/D-sub adapter कं Üयूटर ͧसèटम को इंटरकनेÈट करने के ͧलए
उपयोग ͩकए जाने वाले एडाÜटर का नाम Èया है?
  C 2 Cables used in LED TV 98-99
11 How many bits are used for coding to generate 64 functions in the IR remote control system? 4 bits 6 bits 8 bits 16 bits IR ǐरमोट कं Ěोल ͧसèटम मɅ 64 फ़ं Èशन उ×पÛन
रने के ͧलए कोͫडगं  के ͧलए ͩकतने ǒबɪस का उपयोग ͩकया जाता है?
  B 2 Working of LED TV 98-99
12 Why aluminium is used as lamp body? Block AC Produces heat Dissipate heat Eliminate loss एãयुͧमǓनयम का उपयोग लपɇ   बॉडी के Ǿप मɅ
Èयɉ ͩकया जाता है?
  C 2 Cables used in LED TV 98-99
13 Which microwave repeater station consists of large number of transponders and repeaters? Satellite Telephone exchange Transmitter Earth station ͩकस माइĐोवेव ǐरपीटर èटेशन मɅ बड़ी संÉया मɅ
Ěांसपɉडर और ǐरपीटस[ हɇ?
  A 2 Cables used in LED TV 98-99
14 What is the wavelength of Infra Red light rays produced by the IR LED? 450 to 500 nanometer 550 to 570 nanometer 585 to 595
nanometer
850 to 940
nanometer
IR LED ɮवारा Ǔनͧमत[   इंʼnा रेड लाइट रेज़ कȧ
वेव लɅथ Èया है?
  D 2 Satellite transmitter and receiver 98-99
15 What is the full form of OLED? Organic Light Emitting Diode Organic Layer Enabled Diode Organic Level Enhanced Diode Organic layer Enhanced Diode OLED ा फु ल फॉम[ Èया है?   A 2 OLED TV 98-99
16 What is the function of the circuit?
FM receiver AM transmitter Infrared receiver Infrared transmitter ͩक[ ट का काय[ Èया है?   D 2 Satellite transmitter and receiver 98-99
17 What is the name of the block marked ‘X’ in the infrared remote control receiver?
Sensor Inverter Microchip Regulator इÛĥारेड ǐरमोट कं Ěोल ǐरसीवर मɅ Þलॉक ‘X’ का
ाम Èया है?
  D 2 Working of LED TV 98-99
18 Which principle is used in IR remote control? RF waves Blue tooth signals Photoelectric effect Magnetic flux linkage IR ǐरमोट कं Ěोल मɅ ͩकस ͧसƨांत का उपयोग
ͩकया जाता है?
  C 2 Satellite transmitter and receiver 98-99
 
19 What is the name of the block diagram?
DVD player Set top box Colour transmitter LCD television receiver Þलॉक डायĒाम का नाम Èया है?   B 2 Working of LED TV 98-99
20 Which type of flip flop is used in the Infrared remote control receiver circuit block marked ‘X’?
T flip flop D flip flop JK flip flop Bistable flip flop ͩकस Ĥकार के िÝलप Ýलॉप का उपयोग इंĥारेड
ǐरमोट कं Ěोल ǐरसीवर सͩक[ ट Þलॉक जो X   Ǿप मɅ ͬचिÛहत ͩकया है ’मɅ ͩकया जाता है?
  D 2 Working of LED TV 98-99
21 Which type of connector is used for PCI express audio- video card in the computer? 4 pin connector 6 pin connector 12 pin connector 15 pin connector पीसीआई एÈसĤेस ऑͫडयोवीͫडयो काड[ कं Üयूटर
मɅ ͩकस Ĥकार के  कनेÈटर का उपयोग ͩकया जाता है?
  B 2 Cables used in LED TV 98-99
22 What is the function of the block marked ‘X’ in the remote control transmitter?
Filter Detector Amplifier Oscillator ǐरमोट कं Ěोल Ěांसमीटर मɅ Þलॉक, ‘X’ ͬचिéनत
भाग का काय[ Èया है?
  D 2 Satellite transmitter and receiver 98-99
23 Which fault frequently occurs in the IR type remote control unit? Defective IR LED Broken circuit board Corroded battery contact Wrong positioning of device IR टाइप ǐरमोट कं Ěोल यूǓनट मɅ अÈसर कौन सा
ोष पाया जाता है?
  C 3 Satellite transmitter and receiver 98-99
24 Which section receives the signal from the dish antenna? Encoder Modulator Multiplexer Low Noise Block ͫडश एंटȣना से कौन सा अनुभाग ͧसÊनल ĤाÜत
करता है?
  D 3 Satellite transmitter and receiver 98-99

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