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Test: Methods Of Excitation - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Electrical Machines - Test: Methods Of Excitation

Test: Methods Of Excitation for Electrical Engineering (EE) 2024 is part of Electrical Machines preparation. The Test: Methods Of Excitation questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Methods Of Excitation MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Methods Of Excitation below.
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Test: Methods Of Excitation - Question 1

Consider a DC generator running at the rated speed of 2000 rpm, suddenly there is an insulator falls on the field circuit and breaks it. Then

Detailed Solution for Test: Methods Of Excitation - Question 1

As the field circuit gets broken there is interruption in the flux to the dc machine, and as a result the motor stops in few seconds.

Test: Methods Of Excitation - Question 2

 If a self excited DC generator is failed to run, this refers to

Detailed Solution for Test: Methods Of Excitation - Question 2

Any of the reasons are valid for no build up of an emf.

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Test: Methods Of Excitation - Question 3

The self-excited dc generator with gradual build up of residual voltage and EMF corresponds to

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It responds to a positive feedback because the gain is always more than one in the linear region.

Test: Methods Of Excitation - Question 4

The critical resistance refers to

Detailed Solution for Test: Methods Of Excitation - Question 4

After taking a glance at the magnetization curve, it can be concluded that the emf will not build up if the resistance is greater than critical resistance.

Test: Methods Of Excitation - Question 5

 If a DC shunt generator fails to start, the most primitive action would be

Detailed Solution for Test: Methods Of Excitation - Question 5

The first measure is to check if the field winding as properly connected with additive polarity so that the flux is aiding in nature.

Test: Methods Of Excitation - Question 6

Flashing is used to

Detailed Solution for Test: Methods Of Excitation - Question 6

It is a method to give a kick start to dc machine when its residual magnetism is vanished.

Test: Methods Of Excitation - Question 7

A series generator, having external characteristics which is a straight line through 0 to 50 V at 200 A is connected as a booster, between a station bus-bar and feeders of 0.5 ohm resistors. The voltage at the far end of feeder at current of 50 A is

Detailed Solution for Test: Methods Of Excitation - Question 7

V = voltage drop-voltage added up by boosters
= (0.3*50 – 50*50/200)
= 15-12.50
= 2.5 V

Test: Methods Of Excitation - Question 8

 The number of parallel paths in the armature is increased by

Detailed Solution for Test: Methods Of Excitation - Question 8

 It is increased by increasing magnetic poles which give parallel path to the magnetic circuit.

Test: Methods Of Excitation - Question 9

 A dc series generator as armature and field connections are reversed, the generator

Detailed Solution for Test: Methods Of Excitation - Question 9

It happens due to non build up voltage.

Test: Methods Of Excitation - Question 10

 ____ is responsible for mechanical power output of a DC motor

Detailed Solution for Test: Methods Of Excitation - Question 10

Primarily it is the electrical input power which starts the motoring action.

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