Transmission and Distribution MCQS

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on “Transmission and Distribution”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Electrical engineering Transmission and Distribution comprehensively.

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1.
A 3-phase 4 wire system is commonly used on________________?

Primary transmission

Secondary transmission

Primary distribution

Secondary distribution

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2.
There is a greater possibility of occurence of corona during______________?

Dry weather

Winter

Summer heat

Humid weather

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3.
Which of the following is not a constituent for making porcelain insulators ?

Quartz

Kaolin

Felspar

Silica

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4.
Which of the following materials is used for overhead transmission lines ?

Steel cored aluminium

Galvanised steel

Cadmium copper

Any of the above

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5.
The power transmitted will be maximum when____________?

Corona losses are minimum

Reactance is high

Sending end voltage is more

Receiving end voltage is more

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6.
A feeder, in a transmission system, feeds power to________________?

Distributors

Generating stations

Service mains

All of the above

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7.
The presence of ozone due to corona is harmful because it________________?

Reduces power factor

Corrodes the material

Gives odour

Transfer energy to the ground

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8.
For an overhead line, the surge impedance is taken as________________?

20-30 ohms

70—80 ohms

100—200 ohms

500—1000 ohms

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10.
As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?

31.25 percent of copper

33.3 percent of copper

66.7 percent of copper

125 percent of copper

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11.
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______________?

One-fourth

One-third

One-half

Twice

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12.
Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________?

25 percent

50 percent

75 percent

100 percent

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13.
Large industrial consumers are supplied electrical energy at__________________?

400 V

11 kV

66 kV

400 kV

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14.
The spacing between phase conductors of a 220 kV line is approximately equal to________________?

2 m

3.5 m

6 m

8.5 m

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15.
The minimum clearance between the ground and a 220 kV line is about_________________?

4.3 m

5.5 m

7.0 m

10.5 m

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