A centrifugal switch is used to disconnect starting winding when motor has?

Last Answer : 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.

165 views 1 answer

asked Mar 20, 2018 by anonymous

The starting winding of a single-phase motor is placed in?

Last Answer : The starting winding of a single-phase motor is placed in stator.

114 views 1 answer

asked Mar 20, 2018 by anonymous

If starting winding of a single-phase induction motor is left in the circuit, it will?

Last Answer : If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.

234 views 1 answer

asked Mar 20, 2018 by anonymous

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a?

Last Answer : Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.

215 views 1 answer

asked Mar 20, 2018 by anonymous

The damping winding in synchronous motor is generally used to?

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.

157 views 1 answer

asked Mar 18, 2018 by anonymous

In A.C. series motor compensating winding is employed to?

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

145 views 1 answer

asked Mar 20, 2018 by anonymous

In split-phase motor auxiliary winding is of?

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

72 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...

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.

116 views 1 answer

asked Mar 20, 2018 by anonymous

In a split phase motor, the running winding should have?

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

99 views 1 answer

asked Mar 20, 2018 by anonymous

The value of starting capacitor of a fractional horse power motor will be?

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

98 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

89 views 1 answer

asked Mar 20, 2018 by anonymous

A _________ is used to measure the stator % winding temperature of the generator.

A _________ is used to measure the stator % winding temperature of the generator. (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer
Last Answer : A Resistance thermometer is used to measure the stator % winding temperature of the generator.

3.4k views 1 answer

asked May 8, 2018 by anonymous

In D.C. machines fractional pitch winding is used?

Last Answer : In D.C. machines fractional pitch winding is used to reduce the sparking.

355 views 1 answer

asked Mar 20, 2018 by anonymous

Which type of winding is used in 3 phase shell-type transformer ?

Last Answer : Sandwich type winding is used in 3 phase shell-type transformer.

197 views 1 answer

asked Mar 19, 2018 by anonymous

Damper winding in a synchronous motor

Damper winding in a synchronous motor
Last Answer : Damper winding in a synchronous motor Serves to start the motor.

87 views 1 answer

asked May 8, 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

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

329 views 1 answer

asked May 3, 2018 by anonymous

The purpose of stator winding in the compensated repulsion motor is to?

Last Answer : The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.

110 views 1 answer

asked Mar 20, 2018 by anonymous

In split phase motor main winding is of?

Last Answer : In split phase motor main winding is of thick wire placed at the bottom of the slots.

83 views 1 answer

asked Mar 20, 2018 by anonymous

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will?

Last Answer : If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

257 views 1 answer

asked Mar 20, 2018 by anonymous

In synchronous motor, does the winding losses vary with load?

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.

512 views 1 answer

asked Mar 3, 2018 by anonymous

Earthing switch is used for?

Earthing switch is used for? (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above
Last Answer : Earthing switch is used for? (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above

113 views 1 answer

asked May 8, 2018 by anonymous

List different starting methods of three phase synchronous motor. Explain any one of them.

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.

156 views 1 answer

asked May 7, 2020 by anonymous

In a double squirrel cage induction motor, good starting torque is produced as

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.

136 views 1 answer

asked May 8, 2018 by anonymous

For the same H.P. rating and full load speed, following motor has poor starting torque?

Last Answer : For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.

164 views 1 answer

asked Mar 20, 2018 by anonymous

The starting resistance of a D.C. motor is generally?

Last Answer : The starting resistance of a D.C. motor is generally low.

169 views 1 answer

asked Mar 20, 2018 by anonymous

For starting a D.C. motor a starter is required because?

Last Answer : For starting a D.C. motor a starter is required because it limits the starting current to a safe value.

123 views 1 answer

asked Mar 20, 2018 by anonymous

A synchronous motor can be made self starting by providing?

A synchronous motor can be made self starting by providing?
Last Answer : A synchronous motor can be made self-starting by providing damper bar.

131 views 1 answer

asked Mar 18, 2018 by anonymous

How is a three phase cage induction motor self starting?

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

155 views 1 answer

asked Mar 17, 2018 by anonymous

Is induction motor is self starting?

Is induction motor is self starting?
Last Answer : Single phase induction motor is not self starting. Three phase induction motor is self starting.

111 views 1 answer

asked Mar 17, 2018 by anonymous

Why a dc series motor has a high starting torque?

Why a dc series motor has a high starting torque?
Last Answer : motor

86 views 1 answer

asked Mar 15, 2018 by anonymous

Why starter is required for starting an induction motor?

114 views 0 answers

asked Mar 15, 2018 by anonymous

Why does induction motor have high starting current?

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

143 views 2 answers

asked Mar 15, 2018 by anonymous

which single phase induction motor has highest starting torque?

Last Answer : Capacitor start motor has high torque in starting

133 views 1 answer

asked Sep 13, 2017 by anonymous

The repulsion start induction run motor is used because of?

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

89 views 1 answer

asked Mar 20, 2018 by anonymous

In a two value capacitor motor, the capacitor used for running purposes is?

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

162 views 1 answer

asked Mar 20, 2018 by anonymous

The motor used on small lathes is usually?

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

146 views 1 answer

asked Mar 20, 2018 by anonymous

A shaded pole motor can be used for?

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

103 views 1 answer

asked Mar 20, 2018 by anonymous

In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to?

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.

710 views 1 answer

asked Mar 20, 2018 by anonymous

State two advantages and disadvantages of centrifugal casting. Write four applications.

State two advantages and disadvantages of centrifugal casting. Write four applications.
Last Answer : Centrifugal Casting: Advantages: 1. Relatively very light impurities move inwards towards center. So they can be removed easily thus helping in producing sound castings. 2. Gates and risers are not needed. ... making rollers. 4. Piston rings. 5. Cylinder liners. 6. Pipes of water gas sewage.

50 views 1 answer

asked Jan 2, 2021 by anonymous

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

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

173 views 1 answer

asked May 7, 2020 by anonymous

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

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

154 views 1 answer

asked Sep 18, 2018 by anonymous

The motor used for electric traction is

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
Last Answer : The motor used for electric traction is D.C. series motor

1.0k views 1 answer

asked May 1, 2018 by anonymous