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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: EMF Generated in The Armature - Electrical Engineering (EE) MCQ

Test: EMF Generated in The Armature - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: EMF Generated in The Armature

Test: EMF Generated in The Armature for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: EMF Generated in The Armature questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: EMF Generated in The Armature MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: EMF Generated in The Armature below.
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Test: EMF Generated in The Armature - Question 1
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If the speed of rotation of a separately excited dc machine is halved and the filed strength is also reduced to half of the original. Then the emf induced in the armature

Detailed Solution for Test: EMF Generated in The Armature - Question 1

Emf is proportional to speed of rotation and flux.

Test: EMF Generated in The Armature - Question 2
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If the speed of rotation for a four pole, 220V dc machine is 1 m/s, flux density as 2T having length of bore as 0.1m and radius of 0.5m.The emf induced under pole faces will be

Detailed Solution for Test: EMF Generated in The Armature - Question 2

E = B*l*v
= 2*0.1*1
= 0.2 Volts.

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Test: EMF Generated in The Armature - Question 3
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The induced emf in the armature of a 4-pole dc machine is

Detailed Solution for Test: EMF Generated in The Armature - Question 3

Emf is proportional to speed of rotation and flux.

Test: EMF Generated in The Armature - Question 4
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If the armature current is by mistake increased to 50% for the dc machine,
Detailed Solution for Test: EMF Generated in The Armature - Question 4

Emf is proportional to speed of rotation and flux.

Test: EMF Generated in The Armature - Question 5
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For a four pole, 16 slot armature with two coil-side/slot having lap connected progressive winding has single turn coils. The same machine is then wave wound, the emf induced in the lap wound dc machine to that of wave wound will be
Detailed Solution for Test: EMF Generated in The Armature - Question 5

E=1/(P/2)
=1/(4/2) = 1/2 V.

Test: EMF Generated in The Armature - Question 6
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A duplex lap wound armature is used in six pole dc machine with six brush set. The number of current paths in this machine is
Detailed Solution for Test: EMF Generated in The Armature - Question 6

The number of parallel paths for a lap wound machine is number of parallel paths. As it is a duplex winding, it will have 6*2 = 12 parallel paths.

Test: EMF Generated in The Armature - Question 7
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 For a four pole, 16 slot armature with two coil-side/slot having wave connected progressive winding has single turn coils has simplex winding.The number of current paths
Detailed Solution for Test: EMF Generated in The Armature - Question 7

 The number of parallel path for a wave wound machine is equal to two.

Test: EMF Generated in The Armature - Question 8
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For a four pole, 200 V dc shunt generator having armature resistance of 1 ohms. The current flowing in the armature is 10 A. What is the back emf generated if the terminal voltage of 220 V supply is fed?
Detailed Solution for Test: EMF Generated in The Armature - Question 8

E=V+I*ra
= 220+10*1
=230 Volts.

Test: EMF Generated in The Armature - Question 9
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Emf produced by DC machine, for zero armature current (E1) and non-zero armature current (E2) can be related as__________
Detailed Solution for Test: EMF Generated in The Armature - Question 9

In a DC machine flux density wave in the air gap is flat topped with quarter wave symmetry as long as armature current is equal to 0. For non-zero value of armature current, this quarter wave symmetry is disturbed because of armature reaction. Emf produced is independent of B-wave shape, thus we will get same value for both cases.

Test: EMF Generated in The Armature - Question 10
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Which of the following cannot reduce the terminal voltage of a dc shunt generator?
Detailed Solution for Test: EMF Generated in The Armature - Question 10

Commutation ideally does not reduce the terminal voltage of a dc machine. If it takes place properly at desired timings, the losses can be avoided. Armature reaction, ohmic losses contribute to the losses in the terminal voltage.

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