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UP polytechnic Lecturer (EE) Quiz 9

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Question 1

A 3-ph induction motor under dc dynamic braking work as:-

Question 2

If the current drawn by a DC series motor is increased from 10 A to 12 A (neglect saturation), what is the increase in torque expressed as percentage of initial torque?

Question 3

A 3-phase induction motor is run in counter-clockwise direction as motor with reverse phase sequence of supply. The range of slip variation for this mode is

Question 4

Zero power factor method of an alternator is used to find its.

Question 5

If static voltage of a squirrel case induction motor reduced to 75% of its rated value, the developed torque is reduced by how many % of its full load value?

Question 6

What is the condition of retrogressive winding in dc machines?

Question 7

The full load output current when the maximum efficiency for a transformer having core loss of 200 W occurs at 80% loading and equivalent resistance referred to secondary of 2.5 Ω is:

Question 8

Buchholz’s relay is used in:

Question 9

The full load copper loss of a transformer working at unity power factor is W_c watts. The copper loss at full load 0.8 Pf will be?

Question 10

When starting a differentially connected compound motors, it is desirable to short circuit the series field winding to .......

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AE & JE Exams

Nov 23AE & JE Exams