Question 1 of 15

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

MCCB

ELCB

MCB

OCB

Question 1 of 15

Question 2 of 15

2. What is the name of circuit breaker?

Vacuum circuit breaker

Air blast circuit breaker

Oil circuit breaker

Air break circuit breaker

Question 2 of 15

Question 3 of 15

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

Impulse relay

Thermal relay

Reed relay

Clapper-type armature relay

Question 3 of 15

Question 4 of 15

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

Fuse failure

Components failure

Insulation failure

Human error

Question 4 of 15

Question 5 of 15

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

Minimum voltage rating of relay

Working voltage of relay

Minimum voltage to start the relay

Maximum voltage rating of relay

Question 5 of 15

Question 6 of 15

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

KW

KV

KVAR

MVA

Question 6 of 15

Question 7 of 15

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

General lighting systems

Air conditioners

Ovens

Geysers

Question 7 of 15

Question 8 of 15

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

Poor dielectric strength

Excessive load

Line voltage is too high

Defective tripping mechanism

Question 8 of 15

Question 9 of 15

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

Incorrect setting of relay

Excessive heat

Line voltage is too high

Insufficient air pressure

Question 9 of 15

Question 10 of 15

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

Over voltage and earth fault protection

Open circuit and over voltage protection

Over load and short circuit protection

Open circuit and earth fault protection

Question 10 of 15

Question 11 of 15

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

Reed relay

Voltage relay

Latching relay

Current relay

Question 11 of 15

Question 12 of 15

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

Circuit trips intermittently

Circuit switch off completely

Circuit will not trip on leakage

Circuit functions normally

Question 12 of 15

Question 13 of 15

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

Earth Leakage circuit breaker

Air circuit breaker

Miniature circuit breaker

Moulded case circuit breaker

Question 13 of 15

Question 14 of 15

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

Controlling the Speed in case of fault

Sensing the fault quantities

Interpreting the fault situation to operate breaker

Analyzing the condition of breaker

Question 14 of 15

Question 15 of 15

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

Remote operation

Accurate operation

Easy operation

Emergency operation

Question 15 of 15