Switchgear free Model online Quiz Test2

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Test your caliber

1. Bus coupler is very essential in arrangement _______.
single bus	double bus, double breaker
main and transfer bus	all of the above

2. For cost and safety, the outdoor substa tions are installed for voltages above _______.
11 kV	33 kV
60kV	110kV

3. The short circuit in any winding of the transformer is the result of _______.
mechanical vibration	insulation failure
loose connection	impulse voltage

4. relays are used for phase faults on long line.
Impedance	Reactance
Either of the above	None of the above

5. For which of the following protection from negative sequence currents is provided ?
Generators	Motors
Transmission line	Transformers

6. relay is preferred for phase fault on short transmission line.
Induction type	Reactance
Impedance	None of the above

7. Distance relays are generally _______.
split-phase relays	reactance relays
impedance relays	none of the above

8. For which of the following ratings of the transformer differential protection is recommended ?
above 30 kVA.	equal to and above 5 MVA
equal to and above 25 MVA	none of the above

9. A _______ is used to measure the stator % winding temperature of the generator.
thermocouple	pyrometer
resistance thermometer	thermometer

10. The under voltage relay can be used for ______.
generators	busbars
transformers	all of the above

11. The relay with inverse time characteristic will operate within ______.
1.5 sec	5 to 10 sec
5 to 20 sec	20 to 30 sec

12. The single phasing relays are used for the protection of _______.
single phase motors only	two phase motors only
two single phase motors running in parallel	three phase motors

13. Which of the following devices will receive voltage surge first travelling on the transmission line ?
Lightning arresters	Relays
Step-down transformer	Switchgear

14. Which of the following parameter can be neglected for a short line ?
Inductance	Capacitance
Resistance	Reactance

15. Series reactors should have _______.
low resistance	high resistance
low impedance	high impedance

16. Which of the following circuit breakers has high reliability and minimum maintenance ?
Air blast circuit breakers	Circuit breaker with SF6 gas
Vacuum circuit breakers	Oil circuit breakers

17. Arc in a circuit breaker is interrupted at ______.
zero current	maximum current
minimum voltage	maximum voltage

18. transmission line has reflection coefficient as one.
Open circuit	Short-circuit
Long	None of the above

19. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
Zero	Unity
Infinity	None of the above

20. The inverse definite mean time relays are used for over current and earth fault protection of transformer against ______.
heavy loads	internal short-circuits
external short-circuits	all of the above