Question 1 of 15

1. What is the name of circuit breaker?

Oil circuit breaker

Air blast circuit breaker

Vacuum circuit breaker

Air break circuit breaker

Question 1 of 15

Question 2 of 15

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

Insufficient air pressure

Excessive heat

Line voltage is too high

Incorrect setting of relay

Question 2 of 15

Question 3 of 15

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

OCB

ELCB

MCCB

MCB

Question 3 of 15

Question 4 of 15

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

Working voltage of relay

Maximum voltage rating of relay

Minimum voltage to start the relay

Minimum voltage rating of relay

Question 4 of 15

Question 5 of 15

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

Moulded case circuit breaker

Earth Leakage circuit breaker

Air circuit breaker

Miniature circuit breaker

Question 5 of 15

Question 6 of 15

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

Defective tripping mechanism

Poor dielectric strength

Line voltage is too high

Excessive load

Question 6 of 15

Question 7 of 15

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

Analyzing the condition of breaker

Interpreting the fault situation to operate breaker

Controlling the Speed in case of fault

Sensing the fault quantities

Question 7 of 15

Question 8 of 15

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

Accurate operation

Easy operation

Emergency operation

Remote operation

Question 8 of 15

Question 9 of 15

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

MVA

KW

KVAR

KV

Question 9 of 15

Question 10 of 15

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

Circuit will not trip on leakage

Circuit trips intermittently

Circuit functions normally

Circuit switch off completely

Question 10 of 15

Question 11 of 15

11. 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 11 of 15

Question 12 of 15

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

Open circuit and over voltage protection

Over voltage and earth fault protection

Over load and short circuit protection

Open circuit and earth fault protection

Question 12 of 15

Question 13 of 15

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

Ovens

General lighting systems

Air conditioners

Geysers

Question 13 of 15

Question 14 of 15

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

Latching relay

Current relay

Voltage relay

Reed relay

Question 14 of 15

Question 15 of 15

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

Clapper-type armature relay

Thermal relay

Impulse relay

Reed relay

Question 15 of 15