Single phase induction motors

21.

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

Detailed Solution

22. 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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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
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single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will

23. 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

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

24. 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 high starting torque

Detailed SolutionWhich of the following statements regarding two value capacitor motor is incorrect ?

25. 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 winding of a single phase induction motor is disconnected from supply, it continues to run only on

26. 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

Detailed SolutionStarting

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

27. 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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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 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

28. 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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relatively poor starting torque ?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-single-phase-motors-has-relatively-poor-starting-torque/#more-46524">Detailed SolutionWhich of the following single-phase motors has relatively poor starting torque ?

29. The rotor of a hysteresis motor is made of

aluminium
cast iron
chrome steel
copper

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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

30. 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

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which of the following motor will bepreferred ?" class="read-more button" href="https://exam.pscnotes.com/mcq/if-a-particular-application-needs-high-speed-and-high-starting-torque-then-which-of-the-following-motor-will-bepreferred/#more-46192">Detailed SolutionIf a particular application needs high speed and high starting torque, then which of the following motor will bepreferred ?

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