SSC JE Electrical Engineering 2013

Instructions

For the following questions answer them individually

Question 181

The average value of the voltage wave $$v = 110 + 175 \sin(314t - 25^\circ)$$ volts is

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Question 182

A current from an AC source divides into two branches A and B in parallel. Branch A is an inductor with 30 $$\mu H$$ inductance and 1 Ω resistance. Branch B is another inductor with inductance L and 1.5 Ω resistance. For the ratio of currents in the branches to be independent of supply frequency, value of L should be

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Question 183

A universal motor is one which

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Question 184

If the centrifugal switch of a single phase resistance split induction motor does not open after starting of motor, the motor

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Question 185

Alternators are usually designated to generate which type of AC voltage ?

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Question 186

Three inductors each of 60 mH are connected in delta. The value of inductance of each arm of the equivalent star connection is

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Question 187

The magnetic field energy in an inductor changes from maximum value to minimum value in 5 msec when connected to an AC source. The frequency of the source in Hz is

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Question 188

A voltage source having an open-circuit voltage of 150 V and internal resistance of 75Ω is equivalent to a current source of

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Question 189

A 300 kW alternator is driven by a prime mover of speed regulation 4% while the prime mover of another 200 kW alternator has a speed regulation of 3%. When operating in parallel; the total load they can take without any of them being overloaded is

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Question 190

The commutator in DC machine acts as

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