Wireman – Semester 1, Module 3: Basic Electrical Practice

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Common for Wireman Trade 1st Year

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

1 : Which is conductor? *

2 points

A : Wood

B : Zinc

C : Rubber

D : Mica

2 : What is the property of good conductor? *

2 points

A : Must have low specific resistance

B : Must have high dielectric strength

C : Must have low tensile strength

D : Must have low melting point

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

2 points

A : More rigidity

B : Flexibility

C : High melting point

D : High mechanical strength

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

2 points

A : Low resistance

B : Low melting point

C : High temperature co-efficient

D : High dielectric strength

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

2 points

A : 0V - 250V

B : 650V - 33000V

C : Above 33000V

D : 250V - 650V

6 : Which voltage grading 1100 volt belongs? *

2 points

A : Low Voltage (L.V)

B : Medium Voltage (M.V)

C : High Voltage (H.V)

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

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

2 points

A : 250V-415V

B : 250-650V

C : 1.1KV-11KV

D : Above 33000V

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

3 points

A : Ohms law

B : Kirchoffs current law

C : Kirchoffs voltage law

D : Laws of resistance

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

2 points

A : Resistance

B : Voltage

C : Power

D : Energy

10: Which bulb will have lowest resistance? *

2 points

A : 240V, 60W

B : 240V, 100W

C : 240V, 200W

D : 240V,500W

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

2 points

A : 0.4 ohm

B : 0.04 ohm

C : 25 ohm

D : 400 ohm

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

2 points

A : Ohm/cm

B : Ohm/metre2

C : Ohm-metre

D : Micro ohm/cm²

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

2 points

A : 1.72 micro ohm/cm²

B : 1.72 micro ohm

C : 1.72 ohm /cm²

D : 1.72 micro ohmmeter

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

2 points

A : Increase to two times

B : Increase to four times

C : Decrease to half the value

D : Decrease to ¼ th value

15 : Which is directly proportional to the resistance? *

2 points

A : Area of cross section

B : Length

C : Resistivity

D : Temperature

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

2 points

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

2 points

A : P=I²xR

B : P=R/V²

C : P = IR

D : P =I/V

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

2 points

A : Decrease

B : Remains same

C : Increase 2 times

D : Increase to 1.5 times

19: Calculate the value of series resistor? *

2 points

A : 1380Ω

B : 1390Ω

C : 1400Ω

D : 1492Ω

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

2 points

A : Krichoffs current Law

B : Krichoffs voltage Law

C : Law of Resistance

D : Ohm´s law

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

2 points

A : Ohm´s law

B : Krichoffs Law

C : Laws of Resistance

D : Lenz´s law

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

2 points

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

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

2 points

A : Voltmeter ammeter method

B : Slide wire, bridge method

C : Post office base method

D : Kelvin bridge method

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

2 points

A : Equal

B : Low

C : Very low

D : Very large

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

2 points

A : Thermal expansion

B : Thermal conductivity

C : Temperature coefficient

D : Thermo dynamics

26 : Which material have negative temperature coefficient? *

2 points

A : Carbon

B : Tungsten

C : Nichrome

D : Mangnin

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

2 points

A : Sensistor

B : Thermistor

C : Varistor

D : LDR resistor

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