Question 1 of 28

1. Why does megger's pointer not stabilize at zero when unused?

Deflecting torque proportional to current

Deflecting torque proportional to current²

Air friction damping

No controlling torque

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Question 2 of 28

2. Where are service connection supply leads connected in a consumer main board?

Energy meter

Distribution board

Main switch

IC cut out

Question 2 of 28

Question 3 of 28

3. What is the advantage of crimping?

Easy replacement

Neat appearance

Reduces load current

Avoids loose connections

Question 3 of 28

Question 4 of 28

4. Which principle does the earth resistance tester work on?

Self induction

Fleming's left hand rule

Mutual induction

Fall of potential method

Question 4 of 28

Question 5 of 28

5. Which instrument is used to test new domestic wiring installation?

Multimeter

Series-type ohmmeter

Megger

Shunt-type ohmmeter

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Question 6 of 28

6. Why is system earthing different from equipment earthing?

It's connected to non-current-carrying metal parts

It protects humans only

It's associated with current-carrying conductors

It protects from all circuit faults

Question 6 of 28

Question 7 of 28

7. What is the maximum permissible load for a power sub-circuit as per IE rules?

800 Watt

2000 Watt

3000 Watt

1500 Watt

Question 7 of 28

Question 8 of 28

8. What is the megger reading in a dead short wiring installation?

1 MΩ

500 MΩ

0 MΩ

Infinity

Question 8 of 28

Question 9 of 28

9. What is the minimum size of copper earth continuity conductor used in single-phase domestic wiring as per BIS?

3 Sq.mm

1.5 Sq.mm

3.5 Sq.mm

2.5 Sq.mm

Question 9 of 28

Question 10 of 28

10. For which electrical equipment are 'L' series type MCBs used?

Halogen lamps

Geysers

Air conditioners

Locomotives

Question 10 of 28

Question 11 of 28

11. Where is system earthing done?

Domestic wiring installation

Electroplating installation

Small industrial installation

Generating station

Question 11 of 28

Question 12 of 28

12. Which earth resistance measurement method is illustrated?

Potential dividing

Fall of potential

Fall of current

Current dividing

Question 12 of 28

Question 13 of 28

13. What happens when a person receives a 20mA shock current?

No sensation

Painful shock

Unconsciousness

Heart convulsions

Question 13 of 28

Question 14 of 28

14. What determines ohmmeter needle deflection in earth testers?

Ratio of currents in two coils

Current in current coil

Handle rotation speed

Current in potential coil

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Question 15 of 28

15. How can earth resistance be reduced?

Increasing electrode length

Reducing pit depth

Providing double earthing

Decreasing electrode length

Question 15 of 28

Question 16 of 28

16. Advantage of stranded conductor over solid conductor?

More flexible

Cost is less

Less voltage drop

More insulation resistance

Question 16 of 28

Question 17 of 28

17. Why is AC required to measure earth resistance using an earth resistance tester?

To decrease the voltage drop

To regulate the current

To increase the voltage drop

To avoid electrolytic emf interference

Question 17 of 28

Question 18 of 28

18. What type of test is performed in wiring installation?

Insulation resistance test between conductors

Polarity test

Open circuit test

Insulation resistance test between conductors and earth

Question 18 of 28

Question 19 of 28

19. What is the formula to find voltage drop in an AC single-phase wiring circuit?

Voltage drop = I²R volt

Voltage drop = IR volt

Voltage drop = IR/2 volt

Voltage drop = I/R volt

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Question 20 of 28

20. What causes lamps to glow dim and motors to run slow in domestic wiring?

High value series resistance fault

Short circuit between conductors

Open circuit in earth conductor

Open circuit in neutral line

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Question 21 of 28

21. What is the function of current reverser in earth resistance testers?

Converts AC to DC

Reverses DC polarity

Changes DC supply to AC

Reverses generator rotation direction

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Question 22 of 28

22. What test is carried out using a megger?

Polarity test

Insulation resistance test

Earth conductor continuity test

Earth electrode resistance test

Question 22 of 28

Question 23 of 28

23. What is the permissible leakage current in domestic wiring installation?

1/5000 × Full load current

1/5 × Full load current

1/50 × Full load current

1/500 × Full load current

Question 23 of 28

Question 24 of 28

24. What type of test is conducted in domestic wiring installation?

 

Continuity (or) open circuit test

Insulation resistance test between conductors and earth

Insulation resistance test between conductors

Polarity test

Question 24 of 28

Question 25 of 28

25. In which wiring installation is system earthing done?

Domestic wiring

Godown wiring

Commercial wiring

Substations

Question 25 of 28

Question 26 of 28

26. How to control harmonic distortions in neutral connections per IE rules?

Providing plate earthing

Earthing through impedance

Increasing conductor size

Providing parallel earthing

Question 26 of 28

Question 27 of 28

27. Why is AC supplied for earth resistance measurement?

Provide electrostatic shield

Protect meter coils

Avoid electrolytic emf interference

Reduce meter current

Question 27 of 28

Question 28 of 28

28. Which method is used to reduce earth resistance value in an existing earth pit?

Increasing the length of the electrode

Increasing the diameter of the earth electrode

Adding more sand and charcoal in earth pits

Keeping wet condition in earth pits always

Question 28 of 28