Electrical Engineering MCQs

Page No. 312

Which of the following is usually not the generating voltage ?


a6.6 kV

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b8.8 kV

✓


c11 kV

✖


d13.2 kV

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View Answer 8.8 kV

As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?


a 31.25 percent of copper

✓


b33.3 percent of copper

✖


c66.7 percent of copper

✖


d125 percent of copper

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A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________?


a one-fourth

✓


bone-third

✖


cone-half

✖


d twice

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View Answer one-fourth

Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________?


a 25 percent

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b 50 percent

✓


c 75 percent

✖


d100 percent

✖


View Answer 50 percent

Large industrial consumers are supplied electrical energy at__________________?


a400 V

✖


b11 kV

✓


c66 kV

✖


d400 kV

✖


View Answer 11 kV

The spacing between phase conductors of a 220 kV line is approximately equal to________________?


a2 m

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b 3.5 m

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c 6 m

✓


d8.5 m

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View Answer 6 m

The minimum clearance between the ground and a 220 kV line is about_________________?


a4.3 m

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b5.5 m

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c7.0 m

✓


d10.5 m

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View Answer 7.0 m

The material commonly used for sheaths of underground cables is______________?


a lead

✓


b rubber

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ccopper

✖


d iron

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View Answer lead

The material generally used for armour of high voltage cables is_____________?


aaluminium

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bsteel

✓


c brass

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dcopper

✖


View Answer steel

In transmission lines the cross-arms are made of________________?


acopper

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bwood

✖


cR.C.C.

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dsteel

✓


View Answer steel

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