Last Answer : 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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710 views
1 answer
asked
Mar 20, 2018
by
anonymous

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?
Last 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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116 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a split phase motor, the running winding should have low resistance and high inductance.
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99 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.
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215 views
1 answer
asked
Mar 20, 2018
by
anonymous

Explain the working of a single phase capacitor start induction motor.
Last Answer : Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc
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394 views
2 answers
asked
Jul 30, 2019
by
anonymous

Last 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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875 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : 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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223 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The value of starting capacitor of a fractional horse power motor will be 300 uF .
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98 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The starting winding of a single-phase motor is placed in stator.
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115 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.
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234 views
1 answer
asked
Mar 20, 2018
by
anonymous

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?
Last Answer : 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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231 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : 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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131 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.
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162 views
1 answer
asked
Mar 20, 2018
by
anonymous

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
Last Answer : 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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331 views
1 answer
asked
May 3, 2018
by
anonymous

Last Answer : In split phase motor main winding is of thick wire placed at the bottom of the slots.
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83 views
1 answer
asked
Mar 20, 2018
by
anonymous

List different starting methods of three phase synchronous motor. Explain any one of them.
Last Answer : Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor.
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157 views
1 answer
asked
May 7, 2020
by
anonymous

How is a three phase cage induction motor self starting?
Last Answer : Any type of induction motor is self starting. Because the reason for torqe production require two flux displaced by some angle theta.If theta is constant with time then torqe will be constant;if ... torqe also pulsating. In induction motor this angle theta is not pulsating.so it is self starting
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158 views
1 answer
asked
Mar 17, 2018
by
anonymous

Last Answer : In capacitor start single-phase motors current in the starting winding leads the voltage.
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101 views
1 answer
asked
Mar 20, 2018
by
anonymous

Why is a capacitor used in a single phase motor and not in three phase motor ?
Last 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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260 views
6 answers
asked
Sep 2, 2019
by
anonymous

Last Answer : In split-phase motor auxiliary winding is of thin wire placed at the top of the slots.
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72 views
1 answer
asked
Mar 20, 2018
by
anonymous
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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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217 views
0 answers
asked
Apr 16, 2020
by
anonymous

Last Answer : The rotor developed by a single-phase motor at starting is zero.
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89 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : If the capacitor of a single-phase motor is short-circuited the motor will not start.
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104 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In A.C. series motor compensating winding is employed to reduce sparking at the brushes.
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145 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The repulsion-start induction-run motor is used because of high starting torque.
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89 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : Sandwich type winding is used in 3 phase shell-type transformer.
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197 views
1 answer
asked
Mar 19, 2018
by
anonymous
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Last Answer : Reason is kinetic energy
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285 views
2 answers
asked
Mar 20, 2018
by
anonymous
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Last Answer : Capacitor start motor has high torque in starting
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133 views
1 answer
asked
Sep 13, 2017
by
anonymous

Last Answer : Single phase induction motor usually operates on 0.6 power factor lagging.
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126 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : 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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357 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.
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269 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a split phase motor the starting winding is connected through a centrifugal switch.
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117 views
1 answer
asked
Mar 20, 2018
by
anonymous

What is the difference between a soft start and a VFD?
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76 views
0 answers
asked
Mar 15, 2018
by
anonymous

Damper winding in a synchronous motor
Last Answer : Damper winding in a synchronous motor Serves to start the motor.
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87 views
1 answer
asked
May 8, 2018
by
anonymous

Last Answer : Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.
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222 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.
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110 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.
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257 views
1 answer
asked
Mar 20, 2018
by
anonymous

The damping winding in synchronous motor is generally used to?
Last Answer : The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.
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157 views
1 answer
asked
Mar 18, 2018
by
anonymous

In synchronous motor, does the winding losses vary with load?
Last Answer : No, in the synchronous motor the winding losses do not vary with load.
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512 views
1 answer
asked
Mar 3, 2018
by
anonymous

In a double squirrel cage induction motor, good starting torque is produced as (A) Large current flows through the outer high resistance winding. (B) Large current flows through the inner high ... the outer high resistance winding. (D) Large current flows through the inner low resistance winding.
Last Answer : In a double squirrel cage induction motor, good starting torque is produced as Large current flows through the outer high resistance winding.
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136 views
1 answer
asked
May 8, 2018
by
anonymous

Last Answer : For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.
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164 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The starting resistance of a D.C. motor is generally low.
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169 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : For starting a D.C. motor a starter is required because it limits the starting current to a safe value.
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123 views
1 answer
asked
Mar 20, 2018
by
anonymous

A synchronous motor can be made self starting by providing?
Last Answer : A synchronous motor can be made self-starting by providing damper bar.
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131 views
1 answer
asked
Mar 18, 2018
by
anonymous

Is induction motor is self starting?
Last Answer : Single phase induction motor is not self starting. Three phase induction motor is self starting.
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111 views
1 answer
asked
Mar 17, 2018
by
anonymous

Why a dc series motor has a high starting torque?
Last Answer : motor
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86 views
1 answer
asked
Mar 15, 2018
by
anonymous

Why starter is required for starting an induction motor?
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114 views
0 answers
asked
Mar 15, 2018
by
anonymous

Why does induction motor have high starting current?
Last Answer : In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor
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143 views
2 answers
asked
Mar 15, 2018
by
anonymous

Why synchronous motor Cannot start itself?
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75 views
0 answers
asked
Mar 15, 2018
by
anonymous

Which type of starter is used to start the DC motor?
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77 views
0 answers
asked
Mar 15, 2018
by
anonymous
