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JE 2019 || Day 15 || DC Machines Quiz 3

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Question 1

A d.c. motor is still used in industrial applications because it………………….

Question 2

In a d.c. machine, the number of commutator segments is equal to…………

Question 3

The armature of a d.c. machine is made of……………….

Question 4

Commutation conditions at full load for large DC machines can be efficiently checked by the

Question 5

For a 6-pole d.c. machine with wave wound armature, the number of brushes required is

Question 6

The purpose of using dummy coil in d.c. machines is to

Question 7

The rated speed of a given d.c. shunt motor is 1050 r.p.m. To run this machine at 1200 r.p.m. the following speed control scheme will be used:

Question 8

The commutator of a d.c. machine acts as a ____.

Question 9

If the current in the armature of DC series motor is reduced by 5%, the torque of the motor will become __________.

Question 10

If $Description: Description: E:\Gate\SSC-JE Electrical - Part 1\17_DC-Generators-final-2_files\image039.png$ is the constant loss and $Description: Description: E:\Gate\SSC-JE Electrical - Part 1\17_DC-Generators-final-2_files\image040.png$ is the armature resistance of a d.c. generator, then load current $Description: Description: E:\Gate\SSC-JE Electrical - Part 1\17_DC-Generators-final-2_files\image041.png$ corresponding to maximum efficiency is

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ESE & GATE EE General

Apr 15ESE & GATE EE