What is the principle of DC motor?

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asked Mar 15, 2018 by anonymous

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Explain the working principle of induction motor.

Last answer: Working principle of induction motor: * When the motor is excited with three-phase supply, three-phase stator winding carries three-phase currents & produces a rotating magnetic field of constant magnitude and ... , which tend to move the rotor in the same direction as the rotating magnetic field.

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asked Apr 27, 2020 by anonymous

State the principle of operation of d.c. motor.

Last answer: When a current carrying conductor is placed in a magnetic field, the conductor experiences the force. The magnitude of force is given by F = BIL newton where F – Force B – maximum flux density I – Current L – Length of conductor

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asked Mar 20, 2018 by anonymous

A hysteresis motor works on the principle of?

Last answer: A hysteresis motor works on the principle of hysteresis loss.

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asked Mar 15, 2018 by anonymous

What is the back EMF of a dc motor?

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asked Mar 15, 2018 by anonymous

What are the advantages of DC series motor?

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asked Mar 15, 2018 by anonymous

What is the RPM of a DC motor?

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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 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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asked Aug 25, 2019 by anonymous

If field current is decreased in shunt dc motor, the speed of the motor

If field current is decreased in shunt dc motor, the speed of the motor (a) remains same. (b) increases. (c) decreases. (d) none of the above.

Last answer: increases

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asked Mar 15, 2018 by anonymous

Which type of starter is used to start the DC motor?

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asked Sep 27, 2017 by anonymous

direction of DC motor is given by Fleming's left hand rule or right hand rule?

Last answer: Fleming's left hand rule.

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91 views 1 answer

asked Apr 29, 2018 by anonymous

In a DC motor, it is important to place the brushes along ______

In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

Last answer: In a DC motor, it is important to place the brushes along Magnetic Neutral Axis

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65 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 Apr 28, 2018 by anonymous

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians (A) Armature amp-conductors × (θ/360o) (B) Armature amp-turns × (θ/360o) (C) Armature amp-conductors × (1/4 - θ/360o) (D) Armature amp-conductors × (1/8 - θ/360o)

Last answer: In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians Armature amp-conductors × (1/8 - θ/360o)

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78 views 1 answer

asked Apr 30, 2018 by anonymous

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor : (A) can be operated in first quadrant (B) can be operated in first & second quadrants (C) can be operated in first & fourth quadrants (D) cannot be operated

Last answer: A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor : can be operated in first & fourth quadrants

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asked Apr 29, 2018 by anonymous

The function of a brush and commutator arrangement in a dc motor is to

The function of a brush and commutator arrangement in a dc motor is to (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking

Last answer: The function of a brush and commutator arrangement in a dc motor is to produce unidirectional torque

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asked Mar 15, 2018 by anonymous

Why dc series motor should not be started at no load?

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asked Mar 15, 2018 by anonymous

Why a dc series motor has a high starting torque?

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asked May 3, 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

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169 views 1 answer

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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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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78 views 1 answer

asked Jul 5, 2019 by anonymous

Why does the speed of a DC shunt motor decrease as the load increases?

Last answer: Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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2.5k views 1 answer

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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asked Apr 28, 2018 by anonymous

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Last answer: The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

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asked Mar 11, 2018 by anonymous

Why DC motor is used for traction?

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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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asked Jul 27, 2019 by anonymous

State any four applications of DC shunt motor.

Last answer: Applications of DC shunt motor: 1) Lathe machines 2) drilling machines 3) milling machines 4) Printing machinery 5) Paper industry 6) centrifugal and reciprocating pumps 7) blowers 8)fans

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asked Aug 9, 2017 by anonymous

Armature control of DC motor

Last answer: Armature control of DC motor

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asked Aug 9, 2017 by anonymous

Field control of DC motor

Last answer: Field control of DC motor

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asked Aug 9, 2017 by anonymous

Four Quadrant Operation Of DC Motor

Last answer: Four Quadrant Operation Of DC Motor

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asked Apr 29, 2018 by anonymous

In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at

In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

Last answer: In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is : 0.075

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asked Apr 24, 2020 by anonymous

DC motor gross torque example

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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asked Apr 23, 2020 by anonymous

DC shunt motor

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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asked Apr 22, 2020 by anonymous

DC motor brake test numerical

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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asked Apr 21, 2020 by anonymous

Brake test on DC series motor

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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asked Mar 26, 2018 by anonymous

In DC motor iron losses are occurred in?

Last answer: In DC motor iron losses are occurred in the armature.

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asked Aug 25, 2017 by anonymous

Chopper controlled DC motor

Last answer: Chopper controlled DC motor

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asked Aug 9, 2017 by anonymous

Separately Excited DC motor

Last answer: Separately Excited DC motor

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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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The Eb/V ratio of a d.c. motor is an indication of its?

Last answer: The Eb/V ratio of a d.c. motor is an indication of its efficiency.

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520 views 1 answer

asked Mar 26, 2018 by anonymous

The normal value of the armature resistance of a d.c. motor is?

Last answer: asked Mar 26, 2018 by anonymous The normal value of the armature resistance of a d.c. motor is?

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744 views 2 answers

asked Mar 26, 2018 by anonymous

In a d.c. motor, unidirectional torque is produced with the help of?

In a d.c. motor, unidirectional torque is produced with the help of

Last answer: Commutator provides unidirectional torque and pulsating dc

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245 views 1 answer

asked Mar 20, 2018 by anonymous

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle...

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the?

Last answer: D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the compound motor.

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75 views 1 answer

asked Mar 20, 2018 by anonymous

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value...

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the?

Last answer: D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the series motor.

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206 views 1 answer

asked Mar 20, 2018 by anonymous

When the armature of a D.C. motor rotates, e.m.f. induced is

Last answer: When the armature of a D.C. motor rotates, e.m.f. induced is back e.m.f.

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97 views 1 answer

What is the principle of DC motor?

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