1. which of the following fault result in symmetrical fault
(a) single phase to earth.
(b) all phase to earth.
(c) Phase to Phase.
(d) two Phase to earth. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
2. Electrical Switchgear is consider as low voltage Switchgear if it is rated upto
(a) 400 V.
(b) 1 kV.
(c) 11 kV.
(d) 33kV. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
3. Under normal condition, the voltage across a lighting arrestor is
(a) zero.
(b) very small.
(c) equal to phase voltage.
(d) equal to line voltage. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
4. The most dangerous fault in an alternator is failure of
(a) prime mover.
(b) failure of field.
(c) stator winding fault.
(d) unbalanced loading. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
5. Generally, the circuit breakers are rated term of
(a) volt-ampere.
(b) current.
(c) voltage.
(d) VAR. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
6. Which device is used to protect the power system against traveling waves?
(a) capacitor.
(b) earth wire.
(c) surge diverter.
(d) earthing screen. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
7. In the electric system, Resonance may result in
(a) zero voltage.
(b) high voltage.
(c) low voltage.
(d) high current. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
8. A device which is used to protect an electric circuit from damage caused by over load or short circuit is
(a) Wave trapper.
(b) CVT.
(c) circuit breaker.
(d) lighting arrester. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
9. Main purpose of oil in oil circuit breaker is to
(a) provide insulation.
(b) provide cooling of contacts.
(c) quenching arc.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
10. A thermal protection switch provides protection against
(a) overload.
(b) temperature.
(c) short circuit.
(d) over-voltage. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
11. Which of the following relay is preferred for grounding fault?
(a) Differential relay.
(b) Impedance relay.
(c) IDMT relay.
(d) reactance relay. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
12. The best location for use a booster transformer in a transmission line is
(a) at the sending end.
(b) at the receiving end.
(c) at the intermediate point.
(d) anywhere in the line. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
13. In overhead system, the transmission voltage can be controlled by
(a) excitation control.
(b) using induction regulator.
(c) reactive VAR injection method.
(d) Any of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
14. Arcing voltage will be the least in case of
(a) carbon.
(b) silver.
(c) copper.
(d) tungsten. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
15. An lighting arrester behave like a
(a) non-linear resistance.
(b) linear resistance.
(c) variable resistance.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]