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.

1 answer

127 views

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.

1 answer

240 views

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.

1 answer

219 views

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.

1 answer

163 views

The damping winding in synchronous motor is generally used to?

Description : 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.

1 answer

147 views

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.

1 answer

78 views

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.

1 answer

117 views

The running winding of a single phase motor on testing with meggar is found to be ground...

Description : 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.

1 answer

106 views

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.

1 answer

102 views

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 .

1 answer

91 views

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.

1 answer

3.4k views

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

Description : 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.

1 answer

358 views

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

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

1 answer

203 views

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.

1 answer

92 views

Damper winding in a synchronous motor

Description : Damper winding in a synchronous motor

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

1 answer

358 views

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance

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

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

1 answer

115 views

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.

1 answer

87 views

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.

1 answer

264 views

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.

1 answer

518 views

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

Description : 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.

1 answer

115 views

Earthing switch is used for?

Description : 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

1 answer

171 views

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

Description : 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.

1 answer

140 views

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

Description : 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.

1 answer

166 views

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.

1 answer

169 views

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

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

1 answer

128 views

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.

1 answer

132 views

A synchronous motor can be made self starting by providing?

Description : A synchronous motor can be made self starting by providing?

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

1 answer

166 views

How is a three phase cage induction motor self starting?

Description : 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

1 answer

116 views

Is induction motor is self starting?

Description : Is induction motor is self starting?

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

1 answer

87 views

Why a dc series motor has a high starting torque?

Description : Why a dc series motor has a high starting torque?

Last Answer : motor

1 answer

114 views

Why starter is required for starting an induction motor?

Description : Why starter is required for starting an induction motor?

0 answers

148 views

Why does induction motor have high starting current?

Description : 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

2 answers

142 views

which single phase induction motor has highest starting torque?

Last Answer : Capacitor start motor has high torque in starting

1 answer

94 views

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.

1 answer

165 views

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.

1 answer

149 views

The motor used on small lathes is usually?

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

1 answer

110 views

A shaded pole motor can be used for?

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

1 answer

726 views

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.

1 answer

88 views

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

Description : 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.

1 answer

217 views

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

Description : 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.

1 answer

156 views

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

Description : 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

1 answer

1.1k views

The motor used for electric traction is

Description : 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 answer

65 views

The motor used for the compressors is?

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

1 answer

67 views

The shaded pole motor is used for?