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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Test  >  Electrical Machines  >  Test: DC Motor Starting - Electrical Engineering (EE) MCQ

DC Motor Starting - Free MCQ Practice Test with solutions, GATE EE Electrical


MCQ Practice Test & Solutions: Test: DC Motor Starting (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: DC Motor Starting". 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: DC Motor Starting - Question 1
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A starting resistance is inserted at the starting in an induction motor as well as dc motor.

Detailed Solution: Question 1

For both the machines the purpose is different.

Test: DC Motor Starting - Question 2
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Considering a human handed control system for the dc motor speed control, if the resistance wire cut out too slowly, then

Detailed Solution: Question 2

Due to the slow cut off the resistance the current will be high for a large amount of time and it will cause the machine to burn.

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Test: DC Motor Starting - Question 3
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A 100 hp, 250 V, 350 A shunt dc motor with an armature resistance of 0.05 ohms. To limit maximum starting current to twice the rated of its value, what will be the number of stages of starting resistances?

Detailed Solution: Question 3

n= log(Ra/Rt)/log(Imin/Imax) ; Rt = Vt/Imax= 250/700 = 0.357 ohms
= log(0.05/0.357)/log(350/700)
= 2.84
= 3 (approx).

Test: DC Motor Starting - Question 4
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Following are the observations due to large starting current in dc motor.
(i) Sparking at brushes
(ii) Mechanical shock at shaft
(iii) Source current fluctuations
(iv) Burning of the field winding

Detailed Solution: Question 4

All the observations can be seen due to large starting current in dc motor.

Test: DC Motor Starting - Question 5
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The shunt motor starters that can be used is/are

Detailed Solution: Question 5

Both 3-point and 4-point starters can be used.

Test: DC Motor Starting - Question 6
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The direct-on-line starter is used to start a small dc motor because it limits initial current drawn by armature circuit. 

Detailed Solution: Question 6

The direct-on-line starter can not limit the speed by limiting the current.

Test: DC Motor Starting - Question 7
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Thyristor controlled starter is preferred over DOL starter due to

Detailed Solution: Question 7

A thyristor controlled method is more efficient as it has lesser resistance and losses while operating.

Test: DC Motor Starting - Question 8
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For a 7.46 kW, 200 V dc shunt motor with full load efficiency of 85% has armature resistance of 0.25 ohms. Calculate the value of starting resistance in ohms for a current 1.5 times of the full load current.

Detailed Solution: Question 8

Full load current = 7460/(200*0.85) = 43.88 A
Starting current = 1.5*43.88 = 65.883 A
R = V/I = 200/65.883
= 3.038 ohms
Starting resistance = 3.038 – 0.25 = 2.788 ohms.

Test: DC Motor Starting - Question 9
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The effect of fringing increases as we

Detailed Solution: Question 9

Fringing is the effect in which the magnetic flux lines bulge out of the the flux. and it is introduced at the air gaps.

Test: DC Motor Starting - Question 10
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The post effects of the armature reaction is

Detailed Solution: Question 10

There is no such post effect of armature reaction . The armature reaction phenomena affects the working condition only.

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About this Electrical Engineering (EE) Practice Test

This test contains 10 MCQs on DC Motor Starting 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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