Question 1 of 15

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

MVA

KW

KV

KVAR

Question 1 of 15

Question 2 of 15

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

MCB

ELCB

OCB

MCCB

Question 2 of 15

Question 3 of 15

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

Insulation failure

Components failure

Human error

Fuse failure

Question 3 of 15

Question 4 of 15

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

Circuit trips intermittently

Circuit switch off completely

Circuit functions normally

Circuit will not trip on leakage

Question 4 of 15

Question 5 of 15

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

General lighting systems

Geysers

Ovens

Air conditioners

Question 5 of 15

Question 6 of 15

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

Emergency operation

Easy operation

Accurate operation

Remote operation

Question 6 of 15

Question 7 of 15

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

Air circuit breaker

Earth Leakage circuit breaker

Moulded case circuit breaker

Miniature circuit breaker

Question 7 of 15

Question 8 of 15

8. What is the name of circuit breaker?

Oil circuit breaker

Vacuum circuit breaker

Air blast circuit breaker

Air break circuit breaker

Question 8 of 15

Question 9 of 15

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

Line voltage is too high

Incorrect setting of relay

Excessive heat

Insufficient air pressure

Question 9 of 15

Question 10 of 15

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

Current relay

Voltage relay

Latching relay

Reed relay

Question 10 of 15

Question 11 of 15

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

Open circuit and over voltage protection

Open circuit and earth fault protection

Over load and short circuit protection

Over voltage and earth fault protection

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

Controlling the Speed in case of fault

Interpreting the fault situation to operate breaker

Question 12 of 15

Question 13 of 15

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

Line voltage is too high

Defective tripping mechanism

Poor dielectric strength

Excessive load

Question 13 of 15

Question 14 of 15

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

Impulse relay

Thermal relay

Clapper-type armature relay

Reed relay

Question 14 of 15

Question 15 of 15

15. 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 15 of 15