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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Electrical Machines  >  Test: Permanent Magnet DC (PMDC) Motors - Electrical Engineering (EE) MCQ

Test: Permanent Magnet DC (PMDC) Motors - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Electrical Machines - Test: Permanent Magnet DC (PMDC) Motors

Test: Permanent Magnet DC (PMDC) Motors for Electrical Engineering (EE) 2024 is part of Electrical Machines preparation. The Test: Permanent Magnet DC (PMDC) Motors questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Permanent Magnet DC (PMDC) Motors MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Permanent Magnet DC (PMDC) Motors below.
Solutions of Test: Permanent Magnet DC (PMDC) Motors questions in English are available as part of our Electrical Machines for Electrical Engineering (EE) & Test: Permanent Magnet DC (PMDC) Motors solutions in Hindi for Electrical Machines course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Permanent Magnet DC (PMDC) Motors | 10 questions in 10 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Electrical Machines for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Permanent Magnet DC (PMDC) Motors - Question 1
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The qualities aspired to obtain a good permanent magnet is/are

Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 1

Its both high residual flux as well as coercivity is desired for a good permanent magnet.

Test: Permanent Magnet DC (PMDC) Motors - Question 2
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The type of field winding required in PMMDC is

Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 2

There is no field winding used in PMMDC to create the flux.

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Test: Permanent Magnet DC (PMDC) Motors - Question 3
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PMMDC are smaller in size due to

Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 3

There is no field winding used in PMMDC to create the flux. So it is lighter.

Test: Permanent Magnet DC (PMDC) Motors - Question 4
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PMMDC offers ______ characteristics.
Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 4

As the field remains constant due to the constant field, it has shunt characteristic.

Test: Permanent Magnet DC (PMDC) Motors - Question 5
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Select the possible dc magnetization characteristics of permanent magnetic materials.
Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 5

The magnetic field has a positive value when the magnetic field intensity, H has negative value due to coercivity property. We use second quadrant of hysteresis loop.

Test: Permanent Magnet DC (PMDC) Motors - Question 6
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Mark the speed torque characteristic of the PMDC.
Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 6

 It is linear in nature and also analogous to shunt machine.

Test: Permanent Magnet DC (PMDC) Motors - Question 7
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PMDC had no ________ excited machine.
Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 7

It has no electrical excitation.

Test: Permanent Magnet DC (PMDC) Motors - Question 8
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How to manage run-away issue for dc shunt motor in industry?
Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 8

A PMDC motor can be used to replace the dc shunt motor in industries as they have quite identical characteristics.

Test: Permanent Magnet DC (PMDC) Motors - Question 9
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A PMMDC motor has as armature resistance of 4.2 ohms. When 6 V supply is applied to motor it runs at 1215 rpm drawing 14.5 mA on no-load. The rotational losses is
Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 9

Rotational losses = E*Ia = 5.939* 14.5/1000 = 86.1 mW.

Test: Permanent Magnet DC (PMDC) Motors - Question 10
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 PMMDC can only be armature controlled.
Detailed Solution for Test: Permanent Magnet DC (PMDC) Motors - Question 10

Due to absence of the field winding there is no option of field control.

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