Single phase induction motors

92. In a split phase motor, the running winding should have

high resistance and low inductance
low resistance and high inductance
high resistance as well as high inductance
low resistance as well as low inductiance

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class="read-more button" href="https://exam.pscnotes.com/mcq/in-a-split-phase-motor-the-running-winding-should-have/#more-44167">Detailed SolutionIn a split phase motor, the running winding should have

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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button" href="https://exam.pscnotes.com/mcq/a-centrifugal-switch-is-used-to-disconnect-starting-winding-when-motor-has/#more-43780">Detailed SolutionA centrifugal switch is used to disconnect starting winding when motor has

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

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

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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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

Detailed SolutionIf the

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

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