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

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 pick-up voltage in a over voltage relay indicated?

Minimum voltage to start the relay

Working voltage of relay

Maximum voltage rating of relay

Minimum voltage rating of relay

Question 2 of 15

Question 3 of 15

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

Moulded case circuit breaker

Air circuit breaker

Miniature circuit breaker

Earth Leakage circuit breaker

Question 3 of 15

Question 4 of 15

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

General lighting systems

Ovens

Geysers

Air conditioners

Question 4 of 15

Question 5 of 15

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

KV

KVAR

KW

MVA

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

Excessive load

Line voltage is too high

Poor dielectric strength

Defective tripping mechanism

Question 7 of 15

Question 8 of 15

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

Emergency operation

Easy operation

Remote operation

Accurate operation

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?

Controlling the Speed in case of fault

Analyzing the condition of breaker

Sensing the fault quantities

Interpreting the fault situation to operate breaker

Question 9 of 15

Question 10 of 15

10. 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 10 of 15

Question 11 of 15

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

Reed relay

Impulse relay

Clapper-type armature relay

Thermal relay

Question 11 of 15

Question 12 of 15

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

Circuit functions normally

Circuit trips intermittently

Circuit will not trip on leakage

Circuit switch off completely

Question 12 of 15

Question 13 of 15

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

Insulation failure

Human error

Fuse failure

Components failure

Question 13 of 15

Question 14 of 15

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

Line voltage is too high

Insufficient air pressure

Incorrect setting of relay

Excessive heat

Question 14 of 15

Question 15 of 15

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

Latching relay

Reed relay

Voltage relay

Current relay

Question 15 of 15