Single Phase Induction Motor Quiz | Single Phase Induction Motor Short Questions and Answers

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Questions
41 A reluctance motor
A is self-starting
B is constant speed motor
C needs no D.C. excitation
D all of the above

Answer: all of the above
42 As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for
A fans
B blowers
C sound equipment
D mixer grinders

Answer: sound equipment
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43 Which motor is normally free from mechanical and magnetic vibrations ?
A Split phase motor
B Universal motor
C Hysteresis motor
D Shaded pole motor

Answer: Hysteresis motor
44 In which single-phase motor, the rotor has no teeth or winding ?
A Split phase motor
B Reluctance motor
C Hysteresis motor
D Universal motor

Answer: Hysteresis motor
45 The direction of rotation of universal motor can be reversed the by reversing the flow of current through
A armature winding
B field winding
C either armature winding or field winding
D none of the above

Answer: either armature winding or field winding
46 When a D.C. series motor is connected to A.C. supply, the power factor will be low because of
A high inductance of field and armature circuits
B induced current in rotor due to variations of flux
C fine copper wire winding
D none of the above

Answer: high inductance of field and armature circuits
47 Which of the following motors can be used for unity power factor ?
A Capacitor run motor
B Shaded pole motor
C Hysteresis motor
D Schrage motor

Answer: Schrage motor
48 The speed of a universal motor is generally reduced by using
A gear trains
B V-belts
C brakes
D chains

Answer: gear trains
49 Which type of load is offered by cranes and hoists ?
A Gradually varying load
B Non-reversing, no-load start
C Reversing, light start
D Reversing, heavy start

Answer: Reversing, heavy start
50 Which of the following single-phase motors has relatively poor starting torque ?
A Universal motor
B Repulsion motor
C Capacitor motor
D All single phase motors have zero starting torque

Answer: Capacitor motor
51 The wattage of motor for driving domestic sewing machine will be around
A 100 to 150 W
B 40 to 75 W
C 10 to 30 W
D 5 to 10 W

Answer: 100 to 150 W
52 The wattage rating for a ceiling fan motor will be in the range
A 200 to 250 W
B 250 to 500 W
C 50 to 150 W
D 10 to 20 W

Answer: 50 to 150 W
53 In case of high speed universal motor which of the following needs more attention ?
A End play
B Air gap
C Insulation in rotor
D Balancing of rotor

Answer: Balancing of rotor
54 In case of a shaded pole motor the direction of rotation of the motor is
A from main pole to shaded pole
B from shaded pole to main pole
C either of the above depending on voltage
D either of the above depending on power factor

Answer: from main pole to shaded pole
55 The repulsion-start induction-run motor is used because of
A good power factor
B high efficiency
C minimum cost
D high starting torque

Answer: high starting torque
56 Which of the following motors has highest starting torque ?
A Repulsion motor
B Shaped pole motor
C Capacitor-start motor
D Split-phase motor

Answer: Capacitor-start motor
57 Which of the following single-phase induction motors is generally used in time phonographs ?
A Resistance start
B Capacitor start capacitor run
C Shaded pole
D Universal

Answer: Shaded pole
58 In A.C. series motor compensating winding is employed to
A reduce the effects of armature reaction
B increase the torque
C reduce sparking at the brushes
D none of the above

Answer: reduce sparking at the brushes
59 Which of the following motors can be run on AC. as well as D.C. supply ?
A Universal motor
B Repulsion motor
C Synchronous motor
D Reluctance motor

Answer: Universal motor
60 In a hysteresis motor, the rotor must have
A retentivity
B resistivity
C susceptibility
D none of the above

Answer: retentivity
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