Power Systems Questions and Answers – Effect of Earth on the Three Phase Transmission Line Capacitance – 2

This set of Power Systems test focuses on “Effect of Earth on the Three Phase Transmission Line Capacitance – 2”.

1. The bedding on a cable will consist of _____
a) jute strands
b) hessian tapes
c) paper tape compounded
d) all of the mentioned
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2. A designer wanted to design the insulator for the underground cable, then the estimation of thickness of the insulator will depend on ______________
a) Operating voltage
b) Current to be carried
c) Power factor
d) Operating Voltage and current to be carried
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3. While choosing the insulating materials for the UG cables, it must not possess which of the following characteristics?
a) High water absorption, high dielectric strength
b) Low thermal coefficient
c) Low permittivity
d) Cannot be determined
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4. While choosing the insulating materials for the UG cables, it should possess which of the following characteristics?
a) High water absorption, high dielectric strength
b) Low thermal coefficient
c) Low permittivity, high voltage rupturing ability
d) Low thermal coefficient, Low permittivity, high voltage rupturing ability
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5. Consider the two statements and choose the options.
(i) Transmission of electrical power by dc is economical than with the ac
(ii) In case of dc transmission, there is no charging current which contributes to continuous load.
a) (i) and (ii) are true
b) (i) is only true
c) (ii) is only true
d) (i) and (ii) are false
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6. We can improve the string efficiency by using long cross arms.
a) True
b) False
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7. Corona reduces the transient surges due to _________
a) it dissipates the stored charges
b) it absorbs the charges
c) it raises the electric gradient
d) all of the mentioned
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8. SL type cables, over H-type cables have advantage of mostly ____________
a) possibility of bending of cables
b) less tendency of oil drainage
c) easy transportation
d) reduced possibility of core faults
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9. Control of the reactive power flow in the circuit is essential for maintaining the good voltage regulation.
a) True
b) False
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10. Screened type cables have _____ possibilities of core to core faults when compared to belted type cables.
a) lesser
b) more
c) same
d) cannot be decided
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Sanfoundry Global Education & Learning Series – Power Systems.

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