What are the parts of AC motor?

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asked Mar 15, 2018 by anonymous

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asked May 22, 2020 by anonymous

State at least one function and the material used for the following parts of DC Motor.

Last answer: Part Function Material Yoke -Provides mechanical support for poles -Acts as protecting cover for machine -Provides path for magnetic flux Cast Iron OR Cast Steel Field Winding - ... Pole core Provides mechanical support to field winding. Cast Iron OR Cast Steel

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32 views 1 answer

asked Apr 27, 2020 by anonymous

List the main parts of D.C. motor

Last answer: Main parts of D.C. motor and their functions: Part Functions Yoke i) Provides mechanical support for poles. ii) Acts as protecting cover for machine. iii) Carries magnetic flux. ... a fixed physical position relative to the stator. Shaft Used to transfer mechanical power

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68 views 1 answer

asked Jul 30, 2019 by anonymous

State the function of following parts of DC motor : i) Yoke ii) Poles iii) Field winding iv) Commutator.

Last answer: Function : i) Yoke: The yoke serves the following two purposes. i) It supports the other components such as poles and provides mechanical protection for whole machine. ii) It forms a part of ... one pole to another and thus to help the motor to develop a continuous and unidirectional torque

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93 views 1 answer

asked Mar 15, 2018 by anonymous

What is the principle of AC motor?

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asked Dec 16, 2017 by anonymous

What are the main parts of a generator?

Last answer: the main parts of the generator are as follows yoke Armature Poles field winding Prime mover Commutator Shaft Bearings Brushes

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47 views 1 answer

asked Aug 9, 2017 by anonymous

what is AC motor?

AC motor

Last answer: AC motor AC motor have two types one is Induction motor and second is synchronous motor. Induction motor have two types one is single phase induction motor and second is three phase ... self starting motor so using external motor or we have to start it as induction motor.

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71 views 1 answer

asked Sep 9, 2017 by anonymous

is induction motor ac or dc?

Last answer: Induction motor is a AC motor it is also known as asynchronous motor .

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73 views 1 answer

asked Mar 20, 2018 by anonymous

In a A.C. series motor armature coils are usually connected to commutator?

Last answer: In a A.C. series motor armature coils are usually connected to commutator through resistance.

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85 views 1 answer

asked May 7, 2020 by anonymous

State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Last answer: Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows: 1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine

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asked Apr 28, 2018 by anonymous

The direction of rotation of an inverter fed 3-phase ac motor is reversed by

The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching

Last answer: The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching

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116 views 1 answer

asked Mar 20, 2018 by anonymous

If a D.C. motor is connected across the A.C. supply it will?

Last answer: If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.

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75 views 1 answer

asked Mar 20, 2018 by anonymous

A.C. series motor as compared to D.C. series motor has?

Last answer: A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.

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69 views 1 answer

asked Mar 20, 2018 by anonymous

If a D.C. series motor is operated on A.C. supply, it will?

Last answer: If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

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63 views 1 answer

asked Aug 12, 2018 by anonymous

State the four major parts of Transformer and material used for their construction.

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asked Mar 20, 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.

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90 views 1 answer

asked Mar 15, 2018 by anonymous

What is the difference between an AC and DC generator?

Last answer: The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.

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282 views 1 answer

asked Dec 16, 2017 by anonymous

What are the speed control methods of dc motor?

Last answer: Field control of DC motor Armature control of DC motor

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150 views 2 answers

asked Apr 28, 2018 by anonymous

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor.

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor. lf its shaft load is reduced by half and field current is held constant then its new power factor will be

Last answer: Leading

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455 views 2 answers

asked Aug 25, 2018 by Notes

UNIT 1 fundamentals of AC rotating machine

UNIT 1 fundamentals of AC rotating machine Contents 1.1 Introduction 1.2 Advantages 1.3 Parts of AC machines 1.4 Synchronous speed 1.5 AC winding 1.6 Winding factor (Coil pitch and distributed winding) 1.7 Distribution factor 1.8 EMF equation of alternator or generator 1.9 Numericals 1.10 Harmonic 1.11 Slot harmonics 1.12 Harmonics minimization

Last answer: 1.2 Advantages: In practices most of alternator have rotating magnetic field type construction with stationary armature due to following reason. The generation level of AC voltage may be in the range ... at high speed. Only two Slip rings are required to excited the field by AC supply.

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181 views 2 answers

asked Apr 28, 2018 by anonymous

In a split-phase induction motor, the resistance/reactance ratios of windings are such that

In a split-phase induction motor, the resistance/reactance ratios of windings are such that (A) current in the auxiliary winding leads the current in the main winding (B) current in the auxiliary winding lags the current in the main winding (C) both windings develop the same starting torque (D) both windings develop high starting current

Last answer: In a split-phase induction motor, the resistance/reactance ratios of windings are such that current in the auxiliary winding leads the current in the main winding

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69 views 1 answer

asked Mar 20, 2018 by anonymous

In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will?

Last answer: In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will remain unchanged.

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146 views 1 answer

asked Mar 20, 2018 by anonymous

In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be?

Last answer: In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be less than 50%.

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96 views 1 answer

asked May 7, 2020 by anonymous

State the function of following parts in Induction motor. (i) Stator (ii) Slip rings

Last answer: Name of part Function Stator 1) Stator frame supports the core, terminal box and protects the inner parts. 2) Stator core houses stator winding. 3) Stator winding ... ) Provides facility to connect external resistance to rotor circuit through brushes for starting and control.

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51 views 1 answer

asked Mar 20, 2018 by anonymous

The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it?

Last answer: The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it helps in reducing the tendency of the rotor teeth to remain under the stator teeth.

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118 views 1 answer

asked Mar 20, 2018 by anonymous

What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?

Last answer: The armature may burn if the back e.m.f. of a D.C. motor vanishes suddenly.

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374 views 1 answer

asked Mar 20, 2018 by anonymous

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?

Last answer: Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

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139 views 1 answer

asked Mar 17, 2018 by anonymous

What is the definition of induction motor?

Last answer: its working on magnetic base made by coils and its work with 1 phase or 3 phase ac or dc supply

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99 views 1 answer

asked Mar 17, 2018 by anonymous

What is the function of induction motor?

Last answer: while you give supply to motor its motor run on magnet base

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122 views 1 answer

asked Mar 15, 2018 by anonymous

What is the principle of synchronous motor?

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54 views 0 answers

asked Mar 15, 2018 by anonymous

What is the use of synchronous motor?

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57 views 0 answers

asked Mar 15, 2018 by anonymous

What is the RPM of a DC motor?

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asked Apr 26, 2020 by anonymous

What is the advantage of AC over DC electrical transmission?

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62 views 0 answers

asked Sep 7, 2018 by anonymous

What is the need of polarity marking in polyphase AC circuits?

Last answer: Need of Polarity Marking in Polyphase AC Circuits: i) Polarity marking of terminals provides reference polarity for better understanding of system, even if the polarity of ac voltage changes ... of current transformers in relay protection circuit and getting desired performance is very difficult.

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78 views 1 answer

asked Mar 14, 2018 by anonymous

What is the direction of an AC current?

Last answer: The magnitude and direction of alternating current is changes with respect to time. So for half cycle it is positive and for next half cycle it is negative.

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2.5k views 2 answers

asked Mar 10, 2018 by anonymous

What is the use of AC and DC drives?

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71 views 0 answers

asked Dec 16, 2017 by anonymous

What is the purpose of a capacitor in an AC circuit?

Last answer: Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor

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154 views 1 answer

asked Aug 18, 2019 by anonymous

What would happen if a DC motor was supplied with AC ?

Last answer: With three phase induction motor, humming and not rotate, but if single phase universal motor like air blower, home mixture, motor run on constant speed..speed variation not possible...

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91 views 2 answers

asked Sep 3, 2019 by anonymous

Why are DC motors used in trains and not AC motors ?

Last answer: The reason is torque. torque is inversely proportional to speed..i.e when th knowe train comes to rest position to motion.. initial speed is zero..so it requires high starting torque for ... current will flow through field and armature coils then maximum torque is available at the intial condition.

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138 views 1 answer

asked Oct 18, 2017 by anonymous

are AC and DC resistances same?

Last answer: Resistance is the ability of a circuit or element (which is called resistor) to oppose current. Examples of Resistors with the ability of high resistance are Wood, Air, Mica, Glass, Rubber, Tungsten ... constant. Therefore, only the original resistance of wire comes into play. they are not the same

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60 views 1 answer

asked Mar 15, 2018 by anonymous

What will happen if you increase the current in the motor?

Last answer: Increasing current means increasing frequency of the motor because current is directly proportional to rotations of the motor rotor

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142 views 1 answer

asked Aug 6, 2017 by anonymous

what is the difference between synchronous and asynchronous motor?

Last answer: Asynchronous motors and syncrouns motor are called as dc machines. and also syncrouns motor called as induction motor. Asynonymous motor as are rotates with constant speed we not able to operate . ... It is able to operate. These are a small difference between syncrouns and asynchronous motors.

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237 views 2 answers

asked Aug 15, 2019 by anonymous

What is the conversion between. AC to AC ? DC to DC? AC to DC? DC to AC ?

Last answer: 1.ac to ac is regulation 2.dc to dc is chopper 3.ac to dc is rectifier 4.dc to ac is inverter

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63 views 1 answer

asked Mar 11, 2018 by anonymous

What is the symbol for AC power?

Last answer: If you need to measure alternating current in a circuit, different multimeters have different symbols to measure it (and the corresponding voltage), usually "ACA" and "ACV," or "A" and "V" with a squiggly line (~) next to or above them.

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2.6k views 1 answer

asked Mar 10, 2018 by anonymous

What is the difference between AC and DC drive?

Last answer: AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz

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132 views 1 answer

asked Mar 3, 2018 by anonymous

What is mean by plugging in three phase induction motor?

Last answer: Plugging in three-phase induction motor means interchanging of any two phases of a stator for quick stopping.

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127 views 1 answer

asked Mar 15, 2018 by anonymous

What are the advantages of DC series motor?

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80 views 0 answers

asked Sep 18, 2018 by anonymous

Describe the reason of using dc series motor for electric trains.

Last answer: Electric trains require an inverse torque speed characteristics for proper operation. That is a higher torque is required at start (when speed is nil or low) and as the train picks up ... torque - speed characteristics of DC series motors match, these motors are suitable for electric trains

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114 views 1 answer

asked May 8, 2018 by anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

Last answer: A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

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220 views 1 answer

asked May 8, 2018 by anonymous

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

Last answer: A change of 4% in the supply voltage to an induction motor will produce a change of approximately 8% in the rotor torque

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190 views 1 answer

asked May 1, 2018 by anonymous

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

Last answer: In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth

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209 views 1 answer

What are the parts of AC motor?

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