SSC JE Electrical Engineering 24th Jan 2018 Shift-2

Instructions

For the following questions answer them individually

Question 191

The reverse bias characteristics of a semiconductor diode is shown in

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Question 192

The peak inverse voltage, in case of a bridge rectifier, for each, diode is: (where, Ej, = Peak value of input voltage)

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Question 193

In an electroniccircuit transistor is used for switching ON and OFFa relay, when the transistor switches OFFthe relay, a higher voltage appears across the transistor. How can a transistor be protected from this voltage?

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Question 194

The efficiency of the class B amplifier is approximately:

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Question 195

The oscillations in a synchronous motor can be damped out by

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Question 196

An over excited synchronous motor is used for .........

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Question 197

Synchronous motors are ..........

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Question 198

When any one-phase of a 3-phase synchronous motor is short-circuited, the motor .......

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Question 199

Which of the following can be measured by conducting insulation resistance test on a synchronous motor ?

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Question 200

The under-excited synchronous motor takes ..........

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