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Transmission and Distribution

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

August 11, 2021June 29, 2018 by admin

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

A. primary transmission
B. secondary transmission
C. primary distribution
D. secondary distribution

Categories Transmission and Distribution Leave a comment

There is a greater possibility of occurence of corona during______________?

August 11, 2021June 29, 2018 by admin

There is a greater possibility of occurence of corona during______________?

A. dry weather
B. winter
C. summer heat
D. humid weather
E. none of the above

Categories Transmission and Distribution Leave a comment

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

August 11, 2021June 29, 2018 by admin

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

A. Quartz
B. Kaolin
C. Felspar
D. Silica

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

August 11, 2021June 29, 2018 by admin

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

A. Steel cored aluminium
B. Galvanised steel
C. Cadmium copper
D. Any of the above

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The power transmitted will be maximum when____________?

August 11, 2021June 29, 2018 by admin

The power transmitted will be maximum when____________?

A. corona losses are minimum
B. reactance is high
C. sending end voltage is more
D. receiving end voltage is more

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

August 11, 2021June 29, 2018 by admin

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

A. distributors
B. generating stations
C. service mains
D. all of the above

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

August 11, 2021June 29, 2018 by admin

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
E. none of the above

Categories Transmission and Distribution Leave a comment

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

August 11, 2021June 29, 2018 by admin

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
E. none of the above

Categories Transmission and Distribution Leave a comment

Which of the following is usually not the generating voltage ?

August 11, 2021June 29, 2018 by admin

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

Categories Transmission and Distribution Leave a comment

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

August 11, 2021June 29, 2018 by admin

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

Categories Transmission and Distribution Leave a comment
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