Single phase induction motors

button" href="https://exam.pscnotes.com/mcq/in-which-single-phase-motor-the-rotor-has-no-teeth-or-winding/#more-43791">Detailed SolutionIn which single-phase motor, the rotor has no teeth or winding ?

94. A centrifugal switch is used to disconnect starting winding when motor has

run for about 1 minute
run for about 5 minutes
picked up about 50 to 70 per cent of rated speed
picked up about 10 to 25 per cent of rated speed

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95. In repulsion motor direction of rotation of motor

Is opposite to that of brush shift
Is the same as that of brush shift
Is independent of brush shift
nan

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title="In repulsion motor direction of rotation of motor" class="read-more button" href="https://exam.pscnotes.com/mcq/in-repulsion-motor-direction-of-rotation-of-motor/#more-43481">Detailed SolutionIn repulsion motor direction of rotation of motor

96. Which of the following statements regarding repulsion-start induction motor is incorrect ?

It requires more maintenance of commutator and other mechanical devices
It makes quite a bit of noise on starting
In fractional horse power motors, it has replaced the capacitor motors
It is not easily reversed

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motor is incorrect ?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-statements-regarding-repulsion-start-induction-motor-is-incorrect/#more-43421">Detailed SolutionWhich of the following statements regarding repulsion-start induction motor is incorrect ?

97. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will

Become unstable
Draw excessive armature current and may burn out
Fall out of synchronism and come to stand still
Run as induction motor

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64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 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 when the load is increased so that it cannot maintain synchronous speed the motor will" class="read-more button" href="https://exam.pscnotes.com/mcq/in-case-of-a-reluctance-motor-when-the-load-is-increased-so-that-it-cannot-maintain-synchronous-speed-the-motor-will/#more-43417">Detailed SolutionIn case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will

98. In a

through resistance
through reactances
series motor armature coils are usually connected to commutator A. through resistance B. through reactances C. through capacitors
solidly

Detailed SolutionIn a

99. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in

Damage to the starting winding
Damage to the centrifugal switch
Overloading of running winding
None of the above

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80 percent of synchronous speed of motor, it would result in" class="read-more button" href="https://exam.pscnotes.com/mcq/if-the-centrifugal-switch-does-not-open-at-70-to-80-percent-of-synchronous-speed-of-motor-it-would-result-in/#more-43081">Detailed SolutionIf the
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centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in
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