Question 1 of 15

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

MCCB

ELCB

OCB

MCB

Question 1 of 15

Question 2 of 15

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

Ovens

Air conditioners

Geysers

General lighting systems

Question 2 of 15

Question 3 of 15

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

KVAR

MVA

KV

KW

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 functions normally

Circuit will not trip on leakage

Circuit trips intermittently

Circuit switch off completely

Question 4 of 15

Question 5 of 15

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

Thermal relay

Impulse relay

Clapper-type armature relay

Reed relay

Question 5 of 15

Question 6 of 15

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

Moulded case circuit breaker

Air circuit breaker

Earth Leakage circuit breaker

Miniature circuit breaker

Question 6 of 15

Question 7 of 15

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

Maximum voltage rating of relay

Minimum voltage rating of relay

Working voltage of relay

Minimum voltage to start the relay

Question 7 of 15

Question 8 of 15

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

Human error

Components failure

Fuse failure

Insulation failure

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

Open circuit and over voltage protection

Over load and short circuit protection

Open circuit and earth fault protection

Question 9 of 15

Question 10 of 15

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

Reed relay

Voltage relay

Current relay

Latching relay

Question 10 of 15

Question 11 of 15

11. What is the name of circuit breaker?

Vacuum circuit breaker

Air break circuit breaker

Air blast circuit breaker

Oil circuit breaker

Question 11 of 15

Question 12 of 15

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

Poor dielectric strength

Line voltage is too high

Excessive load

Defective tripping mechanism

Question 12 of 15

Question 13 of 15

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

Easy operation

Accurate operation

Emergency operation

Remote operation

Question 13 of 15

Question 14 of 15

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

Excessive heat

Insufficient air pressure

Line voltage is too high

Incorrect setting of relay

Question 14 of 15

Question 15 of 15

15. 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

Sensing the fault quantities

Controlling the Speed in case of fault

Question 15 of 15