### Module 3: Basic Electrical Practice

**56 : Which is conductor?**

A : Wood

B : Zinc

C : Rubber

D : Mica

**57 : What is the property of good conductor?**

A : Must have low specific resistance

B : Must have high dielectric strength

C : Must have low tensile strength

D : Must have low melting point

**58 : What is the advantage of stranded conductor compared to solid conductor?**

A : More rigidity

B : Flexibility

C : High melting point

D : High mechanical strength

**59 : What is the main property of an insulator?**

A : Low resistance

B : Low melting point

C : High temperature co-efficient

D : High dielectric strength

**60 : What is the voltage grading range of high voltage?**

A : 0V – 250V

B : 650V – 33000V

C : Above 33000V

D : 250V – 650V

**61 : Which voltage grading 1100 volt belongs?**

A : Low Voltage (L.V)

B : Medium Voltage (M.V)

C : High Voltage (H.V)

D : Extra High Voltage (E.H.V)

**62 : What is the voltage grade range of medium voltage?**

A : 250V-415V

B : 250-650V

C : 1.1KV-11KV

D : Above 33000V

**63 : Which law states the relation between the voltage current and resistance in a closed circuit at constant temperature?**

A : Ohms law

B : Kirchoffs current law

C : Kirchoffs voltage law

D : Laws of resistance

**64 : Which electrical quantity is inversely proportional to the current as per ohms law?**

A : Resistance

B : Voltage

C : Power

D : Energy

**65 : Which bulb will have lowest resistance?**

A : 240V, 60W

B : 240V, 100W

C : 240V, 200W

D : 240V,500W

**66 : Calculate the value of resistance connected to the supply voltage of 100V and current through 4 A?**

A : 0.4 ohm

B : 0.04 ohm

C : 25 ohm

D : 400 ohm

**67 : What is the S.I unit of specific resistance?**

A : Ohm/cm

B : Ohm/metre2

C : Ohm-metre

D : Micro ohm/cm²

**68 : What is the specific resistance value of copper conductor?**

A : 1.72 micro ohm/cm²

B : 1.72 micro ohm

C : 1.72 ohm /cm²

D : 1.72 micro ohmmeter

**69 : What is the effect in resistance of the conductor, if its diameter is doubled?**

A : Increase to two times

B : Increase to four times

C : Decrease to half the value

D : Decrease to ¼ th value

**70 : Which is directly proportional to the resistance?**

A : Area of cross section

B : Length

C : Resistivity

D : Temperature

**71 : What is the total resistance (RT) if R1, R2, R3 are connected in series?**

A : RT=R1+R2+R3

B :

C : RT = R1 R2 R3

D :

**72 : What is formula to calculate electric power (P)?**

A : P=I²xR

B : P=R/V²

C : P = IR

D : P =I/V

**73 : What is the change in total resistance value, if additional resistor is connected in a parallel circuit?**

A : Decrease

B : Remains same

C : Increase 2 times

D : Increase to 1.5 times

**74 : Calculate the value of series resistor?**

A : 1380Ω

B : 1390Ω

C : 1400Ω

D : 1492Ω

**75 : Which law states that in each closed circuit the sum of all voltage drops are equal to zero?**

A : Krichoffs current Law

B : Krichoffs voltage Law

C : Law of Resistance

D : Ohm´s law

**76 : Which law is used to determine the equivalent resistance of the network and the current?**

A : Ohm´s law

B : Krichoffs Law

C : Laws of Resistance

D : Lenz´s law

**77 : Which is the correct equation based on Kirchhoff´s first law?**

A : I1 + I3 = I2 + I4 + I5

B : I1 + I2 + I3 = I4 + I5

C : I1 + I2 = I3 + I4 + I5

D : I1 + I2 = I3 + I4 + I5 = 0

**78 : Which is the simplest method used to measure low resistance?**

A : Voltmeter ammeter method

B : Slide wire, bridge method

C : Post office base method

D : Kelvin bridge method

**79 : What is the value of voltmeter resistance (Rv) compared to resistance (Rm) to be measured?**

A : Equal

B : Low

C : Very low

D : Very large

**80 : Which defines that the changes in resistance in ohm per 1°C rise in temperature?**

A : Thermal expansion

B : Thermal conductivity

C : Temperature coefficient

D : Thermo dynamics

**81 : Which material have negative temperature coefficient?**

A : Carbon

B : Tungsten

C : Nichrome

D : Mangnin

**82 : Which resistor has negative temperature co-efficient?**

A : Sensistor

B : Thermistor

C : Varistor

D : LDR resistor