Single Phase Induction Motors — Part 2 MCQs with Explanations

varying the resistance is the correct answer to “The speed control of universal motor used for sewing machines is by”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

At the slot edge where coil enters or comes out of the slot is the correct answer to “The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

Capacitor start motor is the correct answer to “Which of the following motor will give relatively high starting torque”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

5% to 35% is the correct answer to “The range of efficiency for shaded pole motors is”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

Capacitor run motor is the correct answer to “Which of the following motor will have relatively higher power factor”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

thin wire placed at the top of the slots is the correct answer to “In split-phase motor auxiliary winding is of”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

improve power factor is the correct answer to “In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

90° is the correct answer to “In a capacitor start motor, the phase displacement between starting and running winding can be nearly”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

running winding is the correct answer to “After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

lagging is the correct answer to “The power factor of a single-phase induction motor is usually”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding is the correct answer to “To reverse the direction of rotation of acapacitor start motor while it is running we should”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

can be operated either on D.C. or A.C. supply at approximately the same speed and output is the correct answer to “A universal motor is one which”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

a single turn of heavy copper wire which is short-circuited and carries only induced current is the correct answer to “In a shaded pole motor, the shading coil usually consist of”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

low starting torque is the correct answer to “The shaded pole motor is used for”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

high inductance of field and armature circuits is the correct answer to “When a D.C. series motor is connected to A.C. supply, the power factor will be low because of”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

single-phase capacitor run motor is the correct answer to “The motor used on small lathes is usually”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

gear trains is the correct answer to “The speed of a universal motor is generally reduced by using”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

gearing is the correct answer to “The speed of a universal motor is usually reduced by using”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

zero is the correct answer to “The rotor developed by a single-phase motor at starting is”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

nil is the correct answer to “Torque developed by a single phase induction motor at starting is”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

All of the above methods is the correct answer to “Speed control of a universal motor is achieved by”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

It is preferred to permanent-split single-value capacitor motor where frequent reversals are required is the correct answer to “Which of the following statements regarding two value capacitor motor is incorrect”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

It is similar to reluctance motor is the correct answer to “Which of the following statements regarding reluctance-start motor is incorrect”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

Signalling and timing devices is the correct answer to “For which of the applications a reluctance motor is preferred”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

universal motor is the correct answer to “The electric motor used in portable drills is”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

picked up about 50 to 70 per cent of rated speed is the correct answer to “A centrifugal switch is used to disconnect starting winding when motor has”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

either (A) or (B) is the correct answer to “Direction of rotation of a split phase motor can be reversed by reversing the connection of”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

Shaded-pole motor is the correct answer to “Which of the following motors is inherently self starting”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

Hysteresis motor is the correct answer to “In which single-phase motor, the rotor has no teeth or winding”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

shading coils is the correct answer to “In a shaded pole single-phase motor, the revolving field is produced by the use of”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

It cannot be reversed, ordinarily is the correct answer to “Which of the following statements regarding a reluctance motor is incorrect”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

In fractional horse power motors, it has replaced the capacitor motors is the correct answer to “Which of the following statements regarding repulsion-start induction motor is incorrect”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

all of the above is the correct answer to “In a universal motor, the most common cause of brush sparking is”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

Is the same as that of brush shift is the correct answer to “In repulsion motor direction of rotation of motor”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

70 to 80 is the correct answer to “Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

short circuited capacitor is the correct answer to “Burning out of winding is due to”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

It is not self-starting is the correct answer to “Which of the following statements regarding single-phase induction motoris correct”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

It is extremely sensitive to fluctuations in supply voltage is the correct answer to “Which of the following statements regarding hysteresis motor is in incorrect”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

Capacitor motor is the correct answer to “Which of the following single-phase motors has relatively poor starting torque”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.

worn bearings is the correct answer to “If a single phase induction motor runs slower than normal, the most likely defect is”. This question is standard in competitive examination syllabi for Single Phase Induction Motors.