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Test: Operating Characteristics Of DC Motors - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Electrical Machines - Test: Operating Characteristics Of DC Motors

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

Mark the correct option which affects the terminal voltage of a dc shunt motor.

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 1

If the dc motor has compensating winding, flux will remain constant regardless of load.

Test: Operating Characteristics Of DC Motors - Question 2

 For a dc shunt motor of 5 kW, running at 1000 rpm, the induced torque will be

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 2

Torque = Power/(speed in rev/s)
= 5000/(2*pi*1000/60)
= 47.76 N.

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Test: Operating Characteristics Of DC Motors - Question 3

The flux and the internally generated voltage of a dc machine is a ________ function of its magneto-motive force.

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 3

The flux and induced emf are non linear function of its mmf.

Test: Operating Characteristics Of DC Motors - Question 4

It is advised not to run dc series motor with no load. Why?

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 4

If the torque is zero in dc series motor then the speed will be infinite causing the damage of the machine permanently.

Test: Operating Characteristics Of DC Motors - Question 5

Choose the best option which identifies about the below characteristics.​

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 5

Shunt machine has almost constant speed while the series varies as inverse relation with torque.

Test: Operating Characteristics Of DC Motors - Question 6

The speed torque of the differential compound dc motor is shown below. What conclusions can be made?​

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 6

This is basically an unstable scenario which makes the machine unable to be used.

Test: Operating Characteristics Of DC Motors - Question 7

It is impossible to start a differential compounded dc motor.

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 7

 It is so because of the unstable speed and torque characteristics. At starting, armature current and series field current are high. Since the series flux subtracts from shunt flux, series flux actually reverses the magnetic polarity.This motor will typically be still or turn slowly in wrong direction while burning up because of excessive current.

Test: Operating Characteristics Of DC Motors - Question 8

 A student is given a differential compound motor and he has been asked to make it start. How will he try?

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 8

At starting , the flux should be rated so that there is no abnormal situation arise.

Test: Operating Characteristics Of DC Motors - Question 9

For a 100 hp 250 V, compound dc motor with compensating winding has a field current of 5 A to produce a voltage of 250 V at 1200 rpm. What will be the shunt field current of this machine at no load?

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 9

At no load, armature current is zero, so the internal generated voltage is 250 V. So 5 A will be the shunt field current at no load.

Test: Operating Characteristics Of DC Motors - Question 10

A dc shunt motor is connected to the source through 3-point starter. Suddenly if we starter handle is moved fastly from off to on position, then

Detailed Solution for Test: Operating Characteristics Of DC Motors - Question 10

As the starter is placed very rapidly from off to on the resistance seen by the machine will be very less and it will draw a large starting current.

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