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What is the principle of DC motor?
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Mar 15, 2018
by
anonymous
What is the principle of DC motor?
principle
dc
motor
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asked
Mar 15, 2018
by
anonymous
What is the principle of DC generator?
What is the principle of DC generator?
principle
dc
generator
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59
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0
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Mar 15, 2018
by
anonymous
What is the principle of synchronous motor?
What is the principle of synchronous motor?
principle
synchronous
motor
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54
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0
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asked
Mar 15, 2018
by
anonymous
What is the principle of AC motor?
What is the principle of AC motor?
principle
ac
motor
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asked
May 22, 2020
by
anonymous
Explain the working principle of induction motor.
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.
working
principle
induction
motor
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answer
asked
Apr 27, 2020
by
anonymous
State the principle of operation of d.c. motor.
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
state
the
principle
of
operation
d
c
motor
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1
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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.
hysteresis
motor
works
principle
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1
answer
asked
Mar 15, 2018
by
anonymous
What is the back EMF of a dc motor?
What is the back EMF of a dc motor?
back
emf
dc
motor
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asked
Mar 15, 2018
by
anonymous
What are the advantages of DC series motor?
What are the advantages of DC series motor?
advantages
dc
series
motor
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answers
asked
Mar 15, 2018
by
anonymous
What is the RPM of a DC motor?
What is the RPM of a DC motor?
rpm
dc
motor
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0
answers
asked
Aug 18, 2019
by
anonymous
What would happen if a DC motor was supplied with AC ?
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...
dc
motor
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91
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2
answers
asked
Dec 16, 2017
by
anonymous
What are the speed control methods of dc motor?
What are the speed control methods of dc motor?
Last answer:
Field control of DC motor Armature control of DC motor
speed
control
methods
dc
motor
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2
answers
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
shunt
dc
motor
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1.5k
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4
answers
asked
Mar 15, 2018
by
anonymous
Which type of starter is used to start the DC motor?
Which type of starter is used to start the DC motor?
type
starter
used
start
dc
motor
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59
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0
answers
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.
dc
motor
flemings
rule
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91
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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
dc
motor
brushes
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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.
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
parts
dc
motor
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93
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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)
dc
motor
cross-magnetizing
brush
shift
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78
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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
separately
excited
dc
motor
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162
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1
answer
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
function
brush
commutator
dc
motor
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1
answer
asked
Mar 15, 2018
by
anonymous
Why dc series motor should not be started at no load?
Why dc series motor should not be started at no load?
dc
series
motor
started
load
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597
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0
answers
asked
Mar 15, 2018
by
anonymous
Why a dc series motor has a high starting torque?
Why a dc series motor has a high starting torque?
dc
series
motor
high
starting
torque
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0
answers
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
dc
shunt
motor
running
current
armature
winding
resistance
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169
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1
answer
asked
May 22, 2020
by
anonymous
State at least one function and the material used for the following parts of DC Motor.
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
function
parts
dc
motor
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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.
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
state
the
modification
to
be
done
in
dc
series
motor
work
satisfactorily
as
ac
applications
of
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78
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1
answer
asked
Jul 5, 2019
by
anonymous
Why does the speed of a DC shunt motor decrease as the load increases?
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.
why
does
the
speed
of
a
dc
shunt
motor
decrease
as
load
increases
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2.5k
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1
answer
asked
Sep 18, 2018
by
anonymous
Describe the reason of using dc series motor for electric trains.
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
dc
series
motor
electric
trains
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114
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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
dc
shunt
motor
rated
load
speed
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220
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1
answer
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
no-load
speed
single-phase
scr
bridge
converter
fed
separately
excited
dc
motor
operating
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122
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1
answer
asked
Mar 11, 2018
by
anonymous
Why DC motor is used for traction?
Why DC motor is used for traction?
dc
motor
used
traction
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67
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0
answers
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 .
induction
motor
dc
ac
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73
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1
answer
asked
Jul 27, 2019
by
anonymous
State any four applications of DC shunt motor.
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
dc
shunt
motor
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79
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2
answers
asked
Aug 9, 2017
by
anonymous
Armature control of DC motor
Armature control of DC motor
Last answer:
Armature control of DC motor
armature
control
dc
motor
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126
views
2
answers
asked
Aug 9, 2017
by
anonymous
Field control of DC motor
Field control of DC motor
Last answer:
Field control of DC motor
field
control
dc
motor
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91
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2
answers
asked
Aug 9, 2017
by
anonymous
Four Quadrant Operation Of DC Motor
Four Quadrant Operation Of DC Motor
Last answer:
Four Quadrant Operation Of DC Motor
four
quadrant
operation
dc
motor
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207
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1
answer
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
dc
series
motor
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70
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1
answer
asked
Apr 24, 2020
by
anonymous
DC motor gross torque example
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%; }
dc
motor
gross
torque
example
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110
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2
answers
asked
Apr 23, 2020
by
anonymous
DC shunt motor
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%; }
dc
shunt
motor
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108
views
2
answers
asked
Apr 22, 2020
by
anonymous
DC motor brake test numerical
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%; }
dc
motor
brake
test
numerical
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49
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2
answers
asked
Apr 21, 2020
by
anonymous
Brake test on DC series motor
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%; }
brake
test
on
dc
series
motor
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155
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2
answers
asked
Mar 26, 2018
by
anonymous
In DC motor iron losses are occurred in?
In DC motor iron losses are occurred in?
Last answer:
In DC motor iron losses are occurred in the armature.
dc
motor
iron
losses
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110
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1
answer
asked
Aug 25, 2017
by
anonymous
Chopper controlled DC motor
Chopper controlled DC motor
Last answer:
Chopper controlled DC motor
chopper
controlled
dc
motor
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157
views
1
answer
asked
Aug 9, 2017
by
anonymous
Separately Excited DC motor
Separately Excited DC motor
Last answer:
Separately Excited DC motor
separately
excited
dc
motor
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294
views
2
answers
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.
back
emf
dc
motor
vanishes
suddenly
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374
views
1
answer
asked
Mar 11, 2018
by
anonymous
What is the working principle of pressure transmitter?
What is the working principle of pressure transmitter?
working
principle
pressure
transmitter
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103
views
0
answers
asked
Mar 26, 2018
by
anonymous
The Eb/V ratio of a d.c. motor is an indication of its?
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.
ratio
motor
indication
dc
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520
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1
answer
asked
Mar 26, 2018
by
anonymous
The normal value of the armature resistance of a d.c. motor is?
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?
dc
motor
armature
resistance
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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
dc
motor
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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.
dc
motor
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75
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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.
dc
motor
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206
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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.
armature
dc
motor
rotates
emf
induced
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97
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1
answer
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