MCQ Hive - Changing Pathways to Wisdom

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

A. Reduces power factor
B. Corrodes the material
C. Gives odour
D. Transfer energy to the ground

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

A. 20-30 ohms
B. 70—80 ohms
C. 100—200 ohms
D. 500—1000 ohms

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Which of the following is usually not the generating voltage ?

A. 6.6 kv
B. 8.8 kv
C. 11 kv
D. 13.2 kv

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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
B. 33.3 percent of copper
C. 66.7 percent of copper
D. 125 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
B. One-third
C. One-half
D. Twice

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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
B. 50 percent
C. 75 percent
D. 100 percent

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

A. 2 m
B. 3.5 m
C. 6 m
D. 8.5 m

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

A. 4.3 m
B. 5.5 m
C. 7.0 m
D. 10.5 m

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The material commonly used for sheaths of underground cables is______________?

A. Lead
B. Rubber
C. Copper
D. Iron

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

A. Aluminium
B. Steel
C. Brass
D. Copper

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