Question 1 of 15

1. What is the cause for the defect if phase to ground fault on the transmission line?

Fuse failure

Insulation failure

Human error

Components failure

Question 1 of 15

Question 2 of 15

2. What is the name of circuit breaker?

Oil circuit breaker

Air blast circuit breaker

Air break circuit breaker

Vacuum circuit breaker

Question 2 of 15

Question 3 of 15

3. How the rupturing capacity of circuit breaker is rated?

KV

KVAR

MVA

KW

Question 3 of 15

Question 4 of 15

4. What is the defect in an air circuit breaker, if trips intermittently on loading?

Excessive heat

Insufficient air pressure

Incorrect setting of relay

Line voltage is too high

Question 4 of 15

Question 5 of 15

5. Which circuit breaker is installed along with wiring circuit against leakage current protection?

MCCB

OCB

MCB

ELCB

Question 5 of 15

Question 6 of 15

6. What is the defect in a oil circuit breaker if the oil heats up excessively?

Line voltage is too high

Poor dielectric strength

Defective tripping mechanism

Excessive load

Question 6 of 15

Question 7 of 15

7. Which type of relay is used in both A.C and D.C supply?

Clapper-type armature relay

Reed relay

Impulse relay

Thermal relay

Question 7 of 15

Question 8 of 15

8. Which relay hold their contacts in position after power is cutoff?

Reed relay

Latching relay

Current relay

Voltage relay

Question 8 of 15

Question 9 of 15

9. What is the function of Buchholz relay in power transformer?

Over voltage and earth fault protection

Over load and short circuit protection

Open circuit and earth fault protection

Open circuit and over voltage protection

Question 9 of 15

Question 10 of 15

10. Which type of load is protected by 'G' series MCB?

Air conditioners

Ovens

Geysers

General lighting systems

Question 10 of 15

Question 11 of 15

11. What is the purpose of trip coil used in circuit breakers?

Remote operation

Easy operation

Emergency operation

Accurate operation

Question 11 of 15

Question 12 of 15

12. What is the function of relay to the breaking operation of circuit breaker in control circuit?

Analyzing the condition of breaker

Sensing the fault quantities

Interpreting the fault situation to operate breaker

Controlling the Speed in case of fault

Question 12 of 15

Question 13 of 15

13. What is the pick-up voltage in a over voltage relay indicated?

Minimum voltage rating of relay

Working voltage of relay

Maximum voltage rating of relay

Minimum voltage to start the relay

Question 13 of 15

Question 14 of 15

14. What is the effect, if the test button marked as 'X' is closed permanently in ELCB?

Circuit trips intermittently

Circuit functions normally

Circuit switch off completely

Circuit will not trip on leakage

Question 14 of 15

Question 15 of 15

15. Which circuit breaker is used as a switch and protective device in the domestic wiring circuit?

Moulded case circuit breaker

Miniature circuit breaker

Earth Leakage circuit breaker

Air circuit breaker

Question 15 of 15