Electrical Engineering MCQs

Page No. 318

For aluminium, as compared to copper, all the following factors have higher values except:


aspecific volume

✖


b electrical conductivity

✓


cco-efficient of linear expansion

✖


d resistance per unit length for same cross-section

✖



For transmission of power over a distance of 200 km, the transmission voltage should be_________kv?


a132 kV

✓


b66 kV

✖


c33 kV

✖


d11 kV

✖


View Answer 132 kV

Aluminium has a specific gravity of___________?


a1.5

✖


b2.7

✓


c4.2

✖


d7.8

✖


View Answer 2.7

Pin type insulators are generally not used for voltages beyond_________?


a1 kV

✖


b 11 kV

✖


c22 kV

✖


d33 kV

✓


View Answer 33 kV

The current drawn by the line due to corona losses is___________?


anon-sinusoidal

✓


b sinusoidal

✖


ctriangular

✖


dsquare

✖


View Answer non-sinusoidal

The use of strain type insulators is made where the conductors are__________?


adead ended

✖


bat intermediate anchor towers

✖


cany of the above

✓


done of the above

✖


View Answer any of the above

The voltage drop, for constant voltage transmission is compensated by installing__________?


ainductors

✖


bcapacitors

✖


c synchronous motors

✓


dall of above

✖


View Answer synchronous motors

jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?


a6.6 kV (r.m.s. value)/cm

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b 11 kV (r.m.s. value)/cm

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c22 kV (maximum value)/cm

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d30 kV (maximum value)/cm

✓



In a substation the following equipment is not installed?


aexciters

✓


bseries capacitors

✖


c shunt reactors

✖


dvoltatre transformers

✖


View Answer exciters

For which of the following equipment current rating is not necessary?


a Circuit breakers

✖


bIsolators

✓


cLoad break switch

✖


dCircuit breakers and load break switches

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View Answer Isolators

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