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The motor used on small lathes is usually single-phase capacitor run motor.

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The repulsion-start induction-run motor is used because of high starting torque.

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In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.

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A shaded pole motor can be used for toys, hair dryers, circulators etc.

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A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

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Why is it necessary to keep air gaps in magnetic circuits as small as possible?

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Single phase induction motor usually operates on 0.6 power factor lagging.

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State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

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The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

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State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor 

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Name the starters used for following motors : i) 3 H.P. 3-Ph squirrel cage I.M: i) DOL starter OR ii) Star-Delta Starter OR ii) Auto transformer starter OR iii) Soft start starter.  ii) D.C Shunt Motor : 1) Armature resistance starter (Three Point Starter) OR 2) Four Point Starter 

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The motor used for electric traction is  (1) D.C. shunt motor (3) D.C. series motor  (2) D.C. compound motor (4) Synchronous motor

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The motor used for electric traction is D.C. series motor

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The type of D.C. motor used for shears and punches is cumulative compound D.C. motor.

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The motor used for the compressors is capacitor-start capacitor-run motor.

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The shaded pole motor is used for low starting torque.

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The speed control of universal motor used for sewing machines is by varying the resistance.

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The electric motor used in portable drills is universal motor.

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The damping winding in synchronous motor is generally used to?

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The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

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Which type of starter is used to start the DC motor?

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Which type of motor is used in lift?

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Synchronous motor

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Why DC motor is used for traction?

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Which motor is used in traction system?

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The power factor of a single-phase induction motor is usually lagging.

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In a shaded pole motor, the shading coil usually consist of a single turn of heavy copper wire which is short-circuited and carries only induced current.

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A universal motor can run on either A.C. or D.C.

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A schrage motor can run on zero slip, negative slip, positive slip.

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A hysteresis motor works on the principle of hysteresis loss.

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A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

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A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

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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?

Answer :

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 at the slot edge where coil enters or comes out of the slot.

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The duration of sudden short-circuit test on a synchronous motor is usually about one second.

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Short-circuiter is used in repulsion start induction run motor.

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A differentiator is not usually used in control system, because it : - (A) reduces damping  (B) increases error  (C) reduces gain margin  (D) increases input noise

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A differentiator is not usually used in control system, because it : - increases input noise

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The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

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The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

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The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.

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When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

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The speed of a universal motor is generally reduced by using gear trains.

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The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.

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The wattage rating for a ceiling fan motor will be in the range 50 to 150 W .

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In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.

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In A.C. series motor compensating winding is employed to reduce sparking at the brushes.

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In split-phase motor auxiliary winding is of thin wire placed at the top of the slots.

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A single-phase induction motor is inherently non-self-starting with low torque.

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In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

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Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.

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The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.

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In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.

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In repulsion motor direction of rotation of motor is the same as that of brush shift.

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The value of starting capacitor of a fractional horse power motor will be 300 uF .

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In a shaded pole single-phase motor, the revolving field is produced by the use of shading coils.

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The rotor developed by a single-phase motor at starting is zero.

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In a split phase motor the starting winding is connected through a centrifugal switch.

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In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

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If the capacitor of a single-phase motor is short-circuited the motor will not start.

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