SSC JE Electrical Engineering 2011

Instructions

For the following questions answer them individually

Question 131

If the speed of a universal motor in AC operation is $$N_{AC}$$ and in DC operation is $$N_{DC}$$, (and I = current, V = supply voltage, r = resistance, X = reactance, $$\cos \phi$$ = power factor) then the speed ratio

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Question 132

Sheaths are used in underground cables to

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Question 133

If the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency

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Question 134

The power station where coal is used as a fuel is called

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Question 135

Making capacity of a circuit breaker is equal to

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Question 136

A power insulator has 4 units. The voltage across the bottom-most unit is 33.33% of the total voltage. Its string efficiency is

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Question 137

Load factor for the load duration curve shown below is

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Question 138

Resistance switching is normally employed in

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Question 139

Which one is the disadvantage of oil when used as an arc extinguishing medium in the oil circuit breaker

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Question 140

If the discharge voltage of a thyrite arrester is 373 kV rms and the rated voltage is 211kV rms, the discharge factor of the arrester is

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