Single Phase Induction Motor Quiz | Single Phase Induction Motor Multiple Choice Questions with Answers

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Questions
61 Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a
A magnetic relay
B thermal relay
C centrifugal switch
D none of the above

Answer: magnetic relay
62 Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed
A 30 to 40
B 70 to 80
C 80 to 90
D 100

Answer: 70 to 80
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63 In repulsion motor, zero torque is developed when
A brush axis is 45° electrical to field axis
B brush axis coincides with the field axis
C brush axis is 90° electrical to field axis
D both (b) and (c)

Answer: both (b) and (c)
64 Which of the following motors is used in a situation where load increases with speed ?
A Induction motor
B Three-phase series motor
C Schrage motor
D Hysteresis motor

Answer: Three-phase series motor
65 The motor used for the compressors is
A d.c. series motor
B shaded pole motor
C capacitor-start capacitor-run motor
D reluctance motor

Answer: capacitor-start capacitor-run motor
66 Which of the following motors is used for unity power factor ?
A Hysteresis motor
B Schrage motor
C Universal motor
D Reluctance motor

Answer: Schrage motor
67 The purpose of stator winding in the compensated repulsion motor is to
A provide mechanical balance
B improve power factor and provide better speed regulation
C prevent hunting in the motor
D eliminate armature reaction

Answer: provide mechanical balance
68 The speed/load characteristics of a universal motor is same as that of
A A.C. motor
B D.C. shunt motor
C D.C. series motor
D none of the above

Answer: D.C. series motor
69 The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
A improves the efficiency
B helps the rotor teeth to remain under the stator teeth
C helps in reducing the tendency of the rotor teeth to remain under the stator teeth
D improves the power factor

Answer: helps in reducing the tendency of the rotor teeth to remain under the stator teeth
70 The shaded pole motor is used for
A high starting torque
B low starting torque
C medium starting torque
D very high starting torque

Answer: low starting torque
71 In a ceilingfan employing capacitor run motor
A secondary winding surrounds the primary winding
B primary winding surrounds the secondary winding
C both are usual arrangements
D none of the above

Answer: secondary winding surrounds the primary winding
72 Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.
A shunt motor
B series motor
C compound motor
D separately excited motor

Answer: compound motor
73 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

Answer: damage to the starting winding
74 In repulsion motor, maximum torque is developed when
A brush axis is at 45° electrical to the field axis
B brush axis coincides with the field axis
C brush axis is at 90° electrical to the field axis
D none of the above

Answer: brush axis is at 45° electrical to the field axis
75 In split phase motor main winding is of
A thin wire placed at the top of the slots
B thin wire placed at the bottom of the slots
C thick wire placed at the bottom of the slots
D thick wire placed at the top of the” slots

Answer: thick wire placed at the bottom of the slots
76 Torque developed by a single phase induction motor at starting is
A pulsating
B uniform
C none of the above
D nil

Answer: nil
77 The speed control of universal motor used for sewing machines is by
A friction
B varying the resistance
C tapping the field
D centrifugal mechanism

Answer: varying the resistance
78 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

Answer: Pistol drills
79 The electric motor used in portable drills is
A capacitor run motor
B hysteresis motor
C universal motor
D repulsion motor

Answer: universal motor
80 The rotor of a hysteresis motor is made of
A aluminium
B cast iron
C chrome steel
D copper

Answer: chrome steel

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