Single phase induction motors Archives

71.

smaller brush width

less number of field turns

series motor as compared to

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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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class="screen-reader-text">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

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

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Detailed SolutionHysteresis motor 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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following statements regarding two value capacitor motor 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 Solution

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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Detailed SolutionAfter the starting winding of

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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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Detailed SolutionStarting winding of a single phase motor

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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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132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 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 Solution

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

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89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube class="screen-reader-text">Which of the following single-phase motors has relatively poor starting torque ?