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Single Phase Induction Motors - Interview Questions and Answers

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76. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in
A. damage to the starting winding
B. damage to the centrifugal switch
C. overloading of running winding
D. none of the above
Explanation:
77. Which of the following applications always have some load whenever switched on ?
A. Vacuum cleaners
B. Fan motors
C. Pistol drills
D. All of the above
Explanation:
78. Most of the fractional horsepower motors have either
A. hard and annealed bearings
B. ball or roller bearings
C. soft and porous bearings
D. plain or sleeve bearings
Explanation:
79. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on
A. running winding
B. rotor winding
C. field winding
D. compensating winding
Explanation:
80. In a universal motor, the most common cause of brush sparking is
A. open armature winding
B. shorted armature winding
C. shorted field winding"
D. high commutator mica
Explanation:
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