Question 1 of 15

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

Reed relay

Voltage relay

Current relay

Latching relay

Question 1 of 15

Question 2 of 15

2. What is the name of circuit breaker?

Air break circuit breaker

Air blast circuit breaker

Vacuum circuit breaker

Oil circuit breaker

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 defect in a oil circuit breaker if the oil heats up excessively?

Poor dielectric strength

Defective tripping mechanism

Line voltage is too high

Excessive load

Question 4 of 15

Question 5 of 15

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

Accurate operation

Emergency operation

Remote operation

Easy operation

Question 5 of 15

Question 6 of 15

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

Components failure

Fuse failure

Insulation failure

Human error

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

Impulse relay

Reed relay

Thermal relay

Question 7 of 15

Question 8 of 15

8. 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 8 of 15

Question 9 of 15

9. 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 9 of 15

Question 10 of 15

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

Line voltage is too high

Insufficient air pressure

Excessive heat

Incorrect setting of relay

Question 10 of 15

Question 11 of 15

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

Open circuit and earth fault protection

Over voltage and earth fault protection

Over load and short circuit protection

Open circuit and over voltage protection

Question 11 of 15

Question 12 of 15

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

Geysers

Ovens

Air conditioners

General lighting systems

Question 12 of 15

Question 13 of 15

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

ELCB

MCCB

OCB

MCB

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 switch off completely

Circuit will not trip on leakage

Circuit trips intermittently

Circuit functions normally

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?

Air circuit breaker

Moulded case circuit breaker

Earth Leakage circuit breaker

Miniature circuit breaker

Question 15 of 15