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
View Answer
Explanation: All the mentioned are used in protecting a cable and used around the conductor.
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
View Answer
Explanation: Insulation is always function of the voltage applied to it.
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
View Answer
Explanation: An insulator should not have high water retention capability.
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
View Answer
Explanation: An insulator should not have high water retention capability.
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
View Answer
Explanation: Both the statements are correct. DC transmission is economical while its installation is difficult and expensive.
6. We can improve the string efficiency by using long cross arms.
a) True
b) False
View Answer
Explanation: It reduces the ratio of capacity to earth to capacity per insulator.
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
View Answer
Explanation: Due to the charge dissipation, corona is advantageous in reducing the voltages.
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
View Answer
Explanation: Lesser tendency of drainage of the SL-type and H-type cables make them more in demand.
9. Control of the reactive power flow in the circuit is essential for maintaining the good voltage regulation.
a) True
b) False
View Answer
Explanation: Reactive power controls the voltage profile of the transmission line.
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
View Answer
Explanation: Because metal sheathed core has greater core to core thickness for a given diameter.
Sanfoundry Global Education & Learning Series – Power Systems.
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