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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Test  >  Electrical Machines  >  Test: Torque in DC Machines - Electrical Engineering (EE) MCQ

Torque in DC Machines - GATE EE Electrical Free MCQ Test with solutions


MCQ Practice Test & Solutions: Test: Torque in DC Machines (10 Questions)

You can prepare effectively for Electrical Engineering (EE) Electrical Machines with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Torque in DC Machines ". These 10 questions have been designed by the experts with the latest curriculum of Electrical Engineering (EE) 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Torque in DC Machines - Question 1
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 What is the principle of torque production in a dc machine?

Detailed Solution: Question 1

Though all the mentioned laws contribute towards the torque generation, but primarily its the Lorentz’s forces which initiate and define the torque direction.

Test: Torque in DC Machines - Question 2
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 The torque induced beyond the pole shoes in the DC machine is

Detailed Solution: Question 2

The magnetic field vanishes at the pole terminals and thus the cross product with the magnetic field yields zero.

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Test: Torque in DC Machines - Question 3
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The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. Suddenly the switch is closed at t=0, what is observed in the circuit?

Detailed Solution: Question 3

 Initially the induced emf in the armature is zero. But the current will flow as there is terminal source voltage.

Test: Torque in DC Machines - Question 4
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The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What will be the magnitude of the following current at t=0+?

Detailed Solution: Question 4

 I=(V-E)/r
=(120-0)/0.3
=400 A.

Test: Torque in DC Machines - Question 5
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If the torque induced is zero in the dc machine, it can be said that

Detailed Solution: Question 5

The torque at steady state of operation is zero as the emf induced is equal to the source voltage. Also the the very much starting the current will be zero which will not let the emf to get induced.

Test: Torque in DC Machines - Question 6
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The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What is the steady state angular velocity at no-load?

Detailed Solution: Question 6

 v = V/(2*r*l*B)
= 120/(2*0.0005*1*0.25)
= 480 rad/s.

Test: Torque in DC Machines - Question 7
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 If the torque is in the direction of rotation, the DC machine acts as

Detailed Solution: Question 7

The electromagnetic torque generated in the dc generator is in the direction in which the prime mover is rotated.It is produced due to the action of armature current and stator field.

Test: Torque in DC Machines - Question 8
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The cogging torque is absent in the permanent magnet dc machine is due to

Detailed Solution: Question 8

 It is due to the fact that no field poles are induced in PMDC to create magnetic flux leading to harmonics.

Test: Torque in DC Machines - Question 9
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DC Motor torque depends on

Detailed Solution: Question 9

The torque will indeed depend on the geometry as well the magnetic materials used in the construction of the dc machine. Though this remains constant with the machine.

Test: Torque in DC Machines - Question 10
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For a universal motor, the rated supply current is 10A giving a rated torque of 100 N-m. If a current of 5A is applied, what will be generated torque vary to?

Detailed Solution: Question 10

The torque is proportional to the square of the current.
So the new torque will be 100*(2^2)= 400 N-m.

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About this Electrical Engineering (EE) Practice Test

This test contains 10 MCQs on Torque in DC Machines with detailed solutions for each question. It is part of the Electrical Machines course on EduRev, designed to align with the current Electrical Engineering (EE) syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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