Single Phase Induction Motor Quiz | Single Phase Induction Motor MCQs and Answers

81 If a single phase induction motor runs slower than normal, the most likely defect is

[A] worn bearings

[B] short-circuit in the winding

[C] open-circuit in the winding

[D] none of the above

Answer: worn bearings

82 Which of the following motors is used in tape-recorders ?

[A] Hysteresis motor

[B] Reluctance motor

[C] Capacitor-run motor

[D] Universal motor

Answer: Hysteresis motor

83 Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because

[A] it is comparatively cheaper

[B] it has almost non-destructible capacitor

[C] it has low starting as well as running currents at relatively high power factor

[D] it is quiet in operation

Answer: it has low starting as well as running currents at relatively high power factor

84 If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then

[A] motor will not come up to speed

[B] motor will not carry the load

[C] current drawn by the motor will be excessively high

[D] electrolytic capacitor will, in all probability, suffer break down

Answer: electrolytic capacitor will, in all probability, suffer break down

85 If starting winding of a single-phase induction motor is left in the circuit, it will

[A] run faster

[B] spark at light loads

[C] draw excessive current and overheat

[D] run slower

Answer: draw excessive current and overheat