1. The dielectric strength of air under normal condition is
(a) 30 kV/cm.
(b) 100 kV/cm.
(c) 150 kV/cm.
(d) 200 kV/cm. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
2. Peterson coil is used in
(a) DC transmission line.
(b) AC transmission line.
(c) DC generator.
(d) Alternator. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
3. Bundled conductors in EHV transmission lines
(a) increase inductance.
(b) increase capacitance.
(c) decrease inductance.
(d) decrease capacitance. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
4. The most commonly used lighting arrester in substations is
(a) horn gap.
(b) god gap.
(c) thyrite.
(d) multi gap. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
5. The reflection coefficient for a open circuit line is
(a) 1.
(b) zero.
(c) 0.5.
(d) – 1. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
6. The reflection coefficient for a short circuit line is
(a) 1.
(b) Zero.
(c) 0.5.
(d) – 1. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
7. The voltage regulation of a transmission line is greatest for
(a) lagging power factor.
(b) leading power factor.
(c) zero power factor.
(d) none of these. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
8. The function of booster in the circuit is to
(a) reduce current.
(b) increase current.
(c) reduce voltage drop.
(d) compensate for voltage drop. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
9. The rated voltage of a 3-phase power system is given as
(a) rms line to line voltage.
(b) peak line to line voltage.
(c) rms phase voltage.
(d) peak phase voltage. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
10. The number of strands of ACSR conductor for 3 layer transmission line are
(a) 3.
(b) 11.
(c) 19.
(d) 23. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]