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

Test: Permanent Magnet DC (PMDC) Motors for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) 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.
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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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