1. Voltage regulation of a generator at low power factor will be
(A) higher.
(B) lower.
(C) unchanged.
(D) none of these.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
2. The rated voltage of a 3 phase power system is given as
(A) rms phase voltage.
(B) peak phase voltage.
(C) peak line to line voltage.
(D) rms line to line voltage.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] D [/accordion-item][/accordion]
3. Ferranti effect takes place at
(A) light load.
(B) no load.
(C) full load.
(D) light load or no load.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] D [/accordion-item][/accordion]
4. The designed of feeder is mainly depend on
(A) its current carrying capacity.
(B) voltage drop in it.
(C) operating voltage.
(D) operating frequency.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
5. The designed of distributors are generally depend on
(A) its current carrying capacity.
(B) operating voltage.
(C) voltage drop in it.
(D) operating frequency.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
6. Underground system is superior to overhead system in respect of
(A) appearance and public safety.
(B) maintenance cost.
(C) frequency of faults, power failure and accidents.
(D) all of the above.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] D [/accordion-item][/accordion]
7. The main disadvantage of underground system over overhead system is
(A) exposure to lighting.
(B) heavy initial cost.
(C) high losses.
(D) more maintenance.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
8. The main drawback of overhead system over underground system is
(A) more flexible.
(B) higher charging current.
(C) surge problem.
(D) high initial cost.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
9. The mostly used circuit breaker for short line fault without switching resistor is
(A) oil circuit breaker.
(B) air blast circuit breaker.
(C) SF6 breaker.
(D) vacuum circuit breaker
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
10. In a three-phase system, the voltages are separated by
(A) 45°.
(B) 90°.
(C) 120°.
(D) 180°.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
11. In a three-phase system, when the loads are perfectly balanced, the neutral current is
(A) zero.
(B) one-third of maximum.
(C) two-thirds of maximum.
(D) at maximum.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
12. The circuit breakers produce least arc energy is
(A) air blast CB.
(B) air break CB.
(C) minimum oil CB.
(D) plane oil CB.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
13. The designed of insulation of the modern EHV lines is based on
(A) corona.
(B) voltage drop.
(C) switch voltage.
(D) lighting voltage.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
14. A constant load power means a uniform conversion of
(A) mechanical to electrical energy.
(B) electrical to mechanical energy.
(C) current to voltage.
(D) voltage to current.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
15. Air blast circuit breaker is most suitably used upto
(A) 132 kV.
(B) 260 kV.
(C) 400 kV.
(D) none of the above.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]