ELECTRICIAN 2nd YEAR MODULE – Circuit Breakers and Relays ONLINE TEST

Question 1 of 15

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

Sensing the fault quantities

Analyzing the condition of breaker

Controlling the Speed in case of fault

Interpreting the fault situation to operate breaker

Question 1 of 15

Question 2 of 15

2. 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 2 of 15

Question 3 of 15

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

Reed relay

Clapper-type armature relay

Thermal relay

Impulse relay

Question 3 of 15

Question 4 of 15

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

Excessive heat

Insufficient air pressure

Incorrect setting of relay

Line voltage is too high

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

Air circuit breaker

Earth Leakage circuit breaker

Miniature circuit breaker

Question 5 of 15

Question 6 of 15

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

OCB

MCB

MCCB

ELCB

Question 6 of 15

Question 7 of 15

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

Geysers

General lighting systems

Ovens

Air conditioners

Question 7 of 15

Question 8 of 15

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

KW

MVA

KV

KVAR

Question 8 of 15

Question 9 of 15

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

Accurate operation

Emergency operation

Easy operation

Remote operation

Question 9 of 15

Question 10 of 15

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

Working voltage of relay

Minimum voltage to start the relay

Maximum voltage rating of relay

Minimum voltage rating of relay

Question 10 of 15

Question 11 of 15

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

Over load and short circuit protection

Open circuit and over voltage protection

Open circuit and earth fault protection

Over voltage and earth fault protection

Question 11 of 15

Question 12 of 15

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

Excessive load

Defective tripping mechanism

Line voltage is too high

Poor dielectric strength

Question 12 of 15

Question 13 of 15

13. What is the name of circuit breaker?

Air break circuit breaker

Air blast circuit breaker

Oil circuit breaker

Vacuum circuit breaker

Question 13 of 15

Question 14 of 15

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

Reed relay

Current relay

Latching relay

Voltage relay

Question 14 of 15

Question 15 of 15

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

Human error

Insulation failure

Fuse failure

Components failure

Question 15 of 15