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

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

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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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In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.

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In a split phase motor, the running winding should have low resistance and high inductance.

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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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Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because it has low starting as well as running currents at relatively high power factor.

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If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.

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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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To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.

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

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A synchronous motor running with normal excitation adjusts to load increases essentially by increase in armature current.

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Energy conservation technique in induction motor by minimizing idle and redundant running of motor: 1) Loss of energy as the no load power drawn is approximately about 12% to 16% of rated ... to unnecessary line losses. 4) Reduction in overall system energy efficiency over period of time.

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Description :

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

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A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm

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Description :

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

Answer :

The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor

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Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.

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Answer :

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.

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Description :

Why is a capacitor used in a single phase motor and not in three phase motor ?

Answer :

In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

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

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Which capacitor is used for high frequency?

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Answer :

The capacitors used in single-phase capacitor motors have no polarity marking.

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Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

Answer :

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

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Description :

Answer :

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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Commonly used standard capacitor is concentric cylindrical type.

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Why shunt capacitor is used?

Answer :

To improve voltage at receiving end and power factor

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Why capacitor bank is used?

Answer :

In industrial or factory used E.B Power supply must be maintained above 0.90 power factor is compulsory for avoid EB Penalty. So APFC ( automatic Power factor control ) panel is used to maintained balance the load and PF maintained.

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

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

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The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

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In a ceiling fan employing capacitor run motor secondary winding surrounds the primary winding.

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Write two applications of D.C. series motor. 

Answer :

The applications of D.C. series motor: 1. Cranes 2. Hoists 3. Trolley and cars 4. Conveyors 5. For traction work i.e. electric locomotives 6. Elevator 7. Air compressor

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Description :

Explain the working of a single phase capacitor start induction motor. 

Answer :

Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

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Can we use the synchronous motor as the synchronous capacitor?

Answer :

Yes, we can use the synchronous motor as the synchronous capacitor when the synchrnous motor is overexcited.

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

Answer :

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 

Answer :

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

Answer :

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

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Answer :

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

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Answer :

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

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Answer :

The shaded pole motor is used for low starting torque.

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Answer :

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

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Why DC motor is used for traction?

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Answer :

The electric motor used in portable drills is universal motor.

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Description :

The damping winding in synchronous motor is generally used to?

Answer :

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

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135 views 1 answer
Description :

Which type of motor is used in lift?

Answer :

Synchronous motor

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65 views 1 answer
Description :

Which motor is used in traction system?

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Description :

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

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Description :

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

Answer :

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

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Description :

Answer :

In capacitor start single-phase motors current in the starting winding leads the voltage.

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Description :

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor will fall back in phase with respect to the other machine (C) Its portion of share in load will increase (D) Its power factor would be decreased.

Answer :

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then Its portion of share in load will increase

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Description :

Answer :

In case of main-line service free running and coasting periods are generally long.

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