1. An isolator is a device design to operates on
(a) no load.
(b) normal condition.
(c) full load.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
2. A circuit breaker is a device used to
(a) limit the current.
(b) interrupt the circuit.
(c) detect the fault current.
(d) control the fault current. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
3. In power system, the function of relay is to
(a) limit the current.
(b) control the fault current.
(c) detect the fault current.
(d) interrupt the circuit. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
4. The rating of a fuse is expressed in terms of
(a) Ampere.
(b) Volt.
(c) VAR.
(d) Watt. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
5. Which material is used in liquid fuses ?
(a) SF6.
(b) distilled water.
(c) carbon tetra chloride.
(d) transformer oil. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
6. The capacitor switching is easily done with
(a) oil circuit breaker.
(b) air blast circuit breaker.
(c) vacuum circuit breaker.
(d) any one of these. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
7. Which of the following relay is used for phase fault protection of short transmission lines ?
(a) Reactance relay.
(b) Impedance relay.
(c) mho relay.
(d) IDMT relay. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
8. Which of the following relay is used for phase fault protection of medium transmission lines ?
(a) Reactance relay.
(b) Impedance relay.
(c) mho relay.
(d) IDMT relay. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
9. Which of the following relay is used for phase fault protection of long transmission lines ?
(a) Reactance relay.
(b) Impedance relay.
(c) mho relay.
(d) IDMT relay. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
10. Directional relays work on the bases of flow of
(a) frequency.
(b) power.
(c) current.
(d) voltage wave. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
11. H.R.C. fuses provide best protection against
(a) overload.
(b) reverse current.
(c) open-circuits.
(d) short-circuits. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
12. Which of the following circuit breaker produce least arc energy?
(a) Air blast CB
(b) Air break CB.
(c) Minimum oil CB.
(d) Plain oil CB. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
13. In HRC Fuse, the fuse element is mainly made up of
(a) copper.
(b) aluminium.
(c) silver.
(d) lead tin alloy. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
14. A material best suited for manufacturing of fuse wire is
(a) Aluminium.
(b) Silver.
(c) Lead.
(d) Copper. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
15. The end caps used in HRC fuses are made by
(a) porcelain.
(b) brass.
(c) manganin.
(d) nichrome. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]