Semester 4, Module 7-Circuit breaker and Relay

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Electrician and wireman

NAME *

NAME OF THE ITI *

MOBILE NO *

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

3 points

A OCB

B MCB

C ELCB

D MCCB

2. Which relay hold their contacts in position after power is cutoff *

3 points

A Read relay

B Current relay

C Voltage relay

D Latching relay

3. What is the name of circuit breaker? *

3 points

A Oil circuit breaker

B Air blast circuit breaker

C Vacuum circuit breaker

D Air break circuit breaker

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

3 points

A KV

B KW

C MVA

D KVAR

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

3 points

A Working voltage of relay

B Maximum voltage rating of relay

C Minimum voltage rating of relay

D Minimum voltage to start the relay

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

3 points

A Over load and short circuit protection

B Over voltage and earth fault protection

C Open circuit and earth fault protection

D Open circuit and over voltage protection

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

3 points

A Ovens

B Geysers

C Air conditioners |

D General lighting systems

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

3 points

A Reed relay

B Impulse relay

C Thermal relay

D Clapper-type armature relay

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

3 points

A Air circuit breaker

B Miniature circuit breaker

C Moulded case circuit breaker

D Earth Leakage circuit breaker

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

3 points

Easy operation

B Remote operation

C Accurate operation

D Emergency operation

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

0 points

A Sensing the fault quantities

B Analysing the condition of breaker

C Controlling the Speed in case of fault

D Interpreting the fault situation to operate breaker

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

4 points

A Circuit trips intermittently

B Circuit functions normally

C Circuit switch off completely

D Circuit will not trip on leakage

13. What is the defect in an air circuit breaker, if trips intermittendely on loading? *

4 points

A Incorrect setting of relay

B Excessive heat

C Insufficient air pressure

D Line voltage is too high

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

4 points

A Line voltage is too high

B Excessive load

C Poor dielectric strength

D Defective tripping mechanism

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

4 points

A Components failure

B Insulation failure

C Human error

D Fuse failure

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