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
Question 133
If the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency
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
Question 139
Which one is the disadvantage of oil when used as an arc extinguishing medium in the oil circuit breaker
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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