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
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Mar 20, 2018
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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
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Mar 20, 2018
by
anonymous
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Last Answer : In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.
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207 views
1 answer
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Mar 20, 2018
by
anonymous
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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.
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165 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The starting winding of a single-phase motor is placed in stator.
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114 views
1 answer
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Mar 20, 2018
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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
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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
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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
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Mar 18, 2018
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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
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Mar 20, 2018
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
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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
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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
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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
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Mar 20, 2018
by
anonymous

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

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.
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3.4k views
1 answer
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May 8, 2018
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anonymous

Last Answer : In D.C. machines fractional pitch winding is used to reduce the sparking.
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355 views
1 answer
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Mar 20, 2018
by
anonymous
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Last Answer : Sandwich type winding is used in 3 phase shell-type transformer.
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197 views
1 answer
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Mar 19, 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
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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 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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329 views
1 answer
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May 3, 2018
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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
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Mar 20, 2018
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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
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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
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Mar 20, 2018
by
anonymous
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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
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Mar 3, 2018
by
anonymous

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
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113 views
1 answer
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May 8, 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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156 views
1 answer
asked
May 7, 2020
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
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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
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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
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Mar 20, 2018
by
anonymous
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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
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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
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Mar 18, 2018
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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155 views
1 answer
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Mar 17, 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
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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
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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
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Mar 15, 2018
by
anonymous

Last Answer : Capacitor start motor has high torque in starting
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133 views
1 answer
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Sep 13, 2017
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
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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
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Mar 20, 2018
by
anonymous

Last Answer : The motor used on small lathes is usually single-phase capacitor run motor.
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146 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : A shaded pole motor can be used for toys, hair dryers, circulators etc.
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103 views
1 answer
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Mar 20, 2018
by
anonymous

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
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Mar 20, 2018
by
anonymous

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.
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50 views
1 answer
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Jan 2, 2021
by
anonymous

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.
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173 views
1 answer
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May 7, 2020
by
anonymous

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
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154 views
1 answer
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Sep 18, 2018
by
anonymous

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
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1.0k views
1 answer
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May 1, 2018
by
anonymous

Last Answer : The motor used for the compressors is capacitor-start capacitor-run motor.
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62 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The shaded pole motor is used for low starting torque.
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63 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The speed control of universal motor used for sewing machines is by varying the resistance.
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105 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The electric motor used in portable drills is universal motor.
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53 views
1 answer
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Mar 20, 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
