ISRO Scientist or Engineer Electrical 2013

Instructions

For the following questions answer them individually

Question 21

A transformer on no-load is switched on to a source of voltage. It will draw a current ---

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Question 22

On the twosidesof a star/delta transformer ----

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Question 23

In a Scott-connected transformer the number of primary and teaser turns respectively are ----

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Question 24

The use of higher flux density in the transformer design ---

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Question 25

The applied voltage of a certain transformer is increased by 50% while the frequency is reduced by 50%. The maximum coreflux density will become ---

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Question 26

Power input to a transformer on no-load at rated voltage comprises predominantly of

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Question 27

Distribution transformers have core loss

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Question 28

Non loading heat run test on transformers is performed by means of. -

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Question 29

In power lines, series capacitors are used to----

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Question 30

The starting torque of a slip ring induction motor can be increased by

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