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

Question 1 of 15

1. What is the name of circuit breaker?

Air blast circuit breaker

Air break circuit breaker

Vacuum circuit breaker

Oil circuit breaker

Question 1 of 15

Question 2 of 15

2. 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 2 of 15

Question 3 of 15

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

Circuit trips intermittently

Circuit functions normally

Circuit switch off completely

Circuit will not trip on leakage

Question 3 of 15

Question 4 of 15

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

KW

MVA

KV

KVAR

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

Reed relay

Clapper-type armature relay

Question 5 of 15

Question 6 of 15

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

Line voltage is too high

Incorrect setting of relay

Insufficient air pressure

Excessive heat

Question 6 of 15

Question 7 of 15

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

MCCB

MCB

ELCB

OCB

Question 7 of 15

Question 8 of 15

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

Reed relay

Voltage relay

Current relay

Latching relay

Question 8 of 15

Question 9 of 15

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

Minimum voltage rating of relay

Minimum voltage to start the relay

Maximum voltage rating of relay

Working voltage of relay

Question 9 of 15

Question 10 of 15

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

Emergency operation

Accurate operation

Remote operation

Easy operation

Question 10 of 15

Question 11 of 15

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

Open circuit and over voltage protection

Over voltage and earth fault protection

Open circuit and earth fault protection

Over load and short circuit protection

Question 11 of 15

Question 12 of 15

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

Ovens

General lighting systems

Air conditioners

Geysers

Question 12 of 15

Question 13 of 15

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

Excessive load

Poor dielectric strength

Defective tripping mechanism

Line voltage is too high

Question 13 of 15

Question 14 of 15

14. 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 14 of 15

Question 15 of 15

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

Miniature circuit breaker

Earth Leakage circuit breaker

Air circuit breaker

Moulded case circuit breaker

Question 15 of 15