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Transmission & Distribution of Power

1. The document discusses multiple choice questions about transmission and distribution of power. It includes questions about single phase and 3 phase power distribution systems, the location of power factor correction substations, the types of distribution substations, transmission line constants, voltage variation limits, uses of bundled conductors, differences between indoor and outdoor substations, locations of underground substations, the effect of power factor on line losses, classifications of transmission line lengths, uses of 3 phase 4 wire distribution systems, the purpose of transmission line transposition, the effect of supply frequency on skin effect, the relationship between conductor spacing and line inductance, the relationship between line length and capacitance, the distribution of transmission line constants, whether capacitance is a series or

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Gargi Roy
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58 views2 pages

Transmission & Distribution of Power

1. The document discusses multiple choice questions about transmission and distribution of power. It includes questions about single phase and 3 phase power distribution systems, the location of power factor correction substations, the types of distribution substations, transmission line constants, voltage variation limits, uses of bundled conductors, differences between indoor and outdoor substations, locations of underground substations, the effect of power factor on line losses, classifications of transmission line lengths, uses of 3 phase 4 wire distribution systems, the purpose of transmission line transposition, the effect of supply frequency on skin effect, the relationship between conductor spacing and line inductance, the relationship between line length and capacitance, the distribution of transmission line constants, whether capacitance is a series or

Uploaded by

Gargi Roy
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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TRANSMISSION & DISTRIBUTION OF POWER

Multiple Choice Questions:

1.For purely domestic loads, this a.c system is employed for distribution a) single phase 2 wire
b) 3 phase 3 wire c) 3 phase 4 wire d) none of these.
Ans: a)
2. Power factor correction substations are located generally in a) receiving end b) sending end c)
both end d) none of these.
Ans : a)
3. Majority of distribution sub-stations are of a) indoor type b) outdoor type c) pole mounted type
d) none of these.
Ans: c)
4. In any transmission line AD – BC =? a) 0 b) 1 c) infinity d) none of these.
Ans: b)
5.The charging current in a transmission line a) lags voltage by 90° b) leads voltage by 90° c) leads
voltage by 45° d) lags behind by 45°
Ans: b)
6. The statuary limit for voltage variation at the consumer’s terminals is a) − ¿ ¿6 % of declared voltage
+¿ ¿

b)− ¿ ¿10 % of declared voltage c) − ¿ ¿2 % of declared voltage d) none of these.


+¿ ¿ +¿ ¿

Ans: a)
7. Bundled conductors are used to a) reduce inductance of the line b) reduce both inductance &
capacitance c) reduce corona loss d) reduce corona loss & line inductance.
Ans: d)
8.Fault location is a) easier b) harder c) complex d) none of these in an outdoor substation than in
indoor sub station.
Ans: a)
9.Underground substation are generally located in a) thickly populated areas b) hilly areas c) coastal
areas d) none of these.
Ans: a)
10.If the power factor of load decreases, the line losses a) increases b) decreases c) remains same d)
none of these.
Ans: a)increases
11.The length of short transmission line is upto about a)100 km b) 200 km c) 50 km d)120 km.
Ans: 50 km
12.3 phase 4 wire a.c system of distribution is used for a) balanced load b)unbalanced load c) critical
load d) all of the above.
Ans: b)
13.Transposition is done in transmission line to a) reduce line loss b) reduce skin effect c) balance line
voltage drop d) reduce corona.
Ans: c)
14.If the supply frequency increases, then skin effect is a) increases b) decreases c) both a) & b) d)
none of these.
Ans: a)
15.If the spacing between the conductors is increased , the inductance of the line a) decreases b)
increases c) remain same d) none of these.
Ans: b)
16.If the length of the line is decreased its capacitance isa) decreases b) increases c) remain same d)
none of these.
Ans: a)
17.The line constants of the transmission line are a) uniformly distributed b) lumped c) both a) & b)
d) none of these.
Ans: a)
TRANSMISSION & DISTRIBUTION OF POWER

18.The capacitance of a transmission line is a a) series element b) shunt element c) both a) & b) d)
none of these.
Ans: b)
19.In single core cable, armouring is not done in order to avoid a)excessive core losses b) excessive
sheath losses c) both a) & b) d) none of these.
Ans: b)
20.If the length of a cable increases, insulation resistance a) decreases b) increases c) remain same d)
none of these.
Ans: a)

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