SSC JE Electrical Engineering 3rd March 2017 Shift-1

Instructions

For the following questions answer them individually

Question 21

$$\alpha$$-cut off frequency of a bipolar junction transistor increases __________.

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Question 22

A class - A transformer coupled, transistor power amplifier is required to deliver a power output of 10 watts. The maximum power rating of the transistor should not be less than __________.

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Question 23

A switched mode power supply operating at 20kHz to 100kHz range uses as the main switching element is __________.

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Question 24

The diffusion potential across a p-n junction __________.

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Question 25

As compared to a full-wave rectifier using two diodes, the four diode bridge rectifier has the dominant advantage of __________.

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Question 26

In DC shunt motor, if the terminal voltage is reduced to half and torque remains the same then __________.

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Question 27

The exciting coils of any DC machine are wound __________.

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Question 28

Which of the following DC motors has the least drop in speed between no load to nominal load?

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Question 29

Which of the following motors is used to derive the constant speed line shafting lathes, blowers and fans?

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Question 30

If the field of a DC shunt motor is opened ______.

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