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Electrical Machines Quiz UPPCL JE 2017

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Question 1

For producing an e.m.f. of given frequency, an alternator will run at greatest speed for ……………… poles.

Question 2

A d.c. shunt motor takes 5A at 100V when running light. Shunt field resistance is 50Ω and armature resistance is 0.2Ω, iron and friction losses are

Question 3

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

Question 4

An ideal transformer is one which…………..

Question 5

A single phase transformer has 400 primary and 1000 secondary turns. The net cross-sectional area of the core is

If the primary is connected to

source, what is the voltage induced in the secondary?

Question 6

At starting, the winding of a 220 V, 50 Hz split-phase induction motor has the following values:

What is the phase angle between

Question 7

If N_s and N are the speeds of rotating field and rotor respectively, then the ratio of rotor output/rotor input is equal to……………

Question 8

An iron-cored transformer working at a maximum flux density of

is replaced by silicon steel working at a maximum flux density of

It the total flux is to remain unchanged, what is the reduction in volume expressed as a percentage of the original volume? The frequency and voltage per turn are the same.

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ESE & GATE EE Electrical Machines

Dec 18ESE & GATE EE