Single phase induction motors

71.

smaller brush width
less number of field turns
series motor as compared to

Detailed Solution

72. A capacitor-start single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will

start and then stop
start and run slowly
start and run at rated speed
not start at all

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replaced by an inductor of equivalent reactance value. It will" class="read-more button" href="https://exam.pscnotes.com/mcq/a-capacitor-start-single-phase-induction-motor-is-switched-on-to-supply-with-its-capa-citor-replaced-by-an-inductor-of-equivalent-reactance-value-it-will/#more-48160">Detailed SolutionA capacitor-start single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will

73. Hysteresis motor is particularly useful for high-quality record players and tape-recorders because

it revolves synchronously
it is not subject to any magnetic or mechanical vibrations
it can be easily manufactured in extremely small sizes of up to 1 W output
it develops hysteresis torque which is extremely steady both in amplitude and phase

Detailed SolutionHysteresis motor

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is particularly useful for high-quality record players and tape-recorders because

74. Which of the following statements regarding two value capacitor motor is incorrect ?

It is a reversing motor
It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
It has low starting as well as rushing currents
It has high starting torque

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is incorrect ?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-statements-regarding-two-value-capacitor-motor-is-incorrect/#more-47140">Detailed SolutionWhich of the following statements regarding two value capacitor motor is incorrect ?

75. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on

running winding
rotor winding
field winding
compensating winding

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button" href="https://exam.pscnotes.com/mcq/after-the-starting-winding-of-a-single-phase-induction-motor-is-disconnected-from-supply-it-continues-to-run-only-on/#more-46865">Detailed SolutionAfter the starting
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winding of a single phase induction motor is disconnected from supply, it continues to run only on

76. Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a

Magnetic relay
Thermal relay
Centrifugal switch
None of the above

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the circuit by means of a" class="read-more button" href="https://exam.pscnotes.com/mcq/starting-winding-of-a-single-phase-motor-of-a-refrigerator-is-disconnected-from-the-circuit-by-means-of-a/#more-46666">Detailed SolutionStarting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a

77. Burning out of winding is due to

short circuited capacitor
capacitor value hiving changed
open circuiting of capacitor
none of the above

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81.2-142.7 81.2z"/> Subscribe on YouTube due to" class="read-more button" href="https://exam.pscnotes.com/mcq/burning-out-of-winding-is-due-to/#more-46626">Detailed SolutionBurning out of winding is due to

78. Which of the following single-phase motors has relatively poor starting torque ?

Universal motor
Repulsion motor
Capacitor motor
All single phase motors have zero starting torque

Detailed SolutionWhich

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of the following single-phase motors has relatively poor starting torque ?

79. The rotor of a hysteresis motor is made of

aluminium
cast iron
chrome steel
copper

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81.2z"/> Subscribe on YouTube href="https://exam.pscnotes.com/mcq/the-rotor-of-a-hysteresis-motor-is-made-of/#more-46507">Detailed SolutionThe rotor of a hysteresis motor is made of

80. If a particular application needs high speed and high starting torque, then which of the following motor will bepreferred ?

Universal motor
Shaded pole type motor
Capacitor start motor
Capacitor start and run motor

Detailed SolutionIf a particular application

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needs high speed and high starting torque, then which of the following motor will bepreferred ?

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