Discuss
menu
search
person
Login
Register
search
edit
Ask a Question
Discuss
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Ask a Question
D.C. shunt motors are used for driving?
Speak Question
asked
Mar 20, 2018
by
anonymous
dc
shunt
motors
used
driving
thumb_up_alt
0
like
thumb_down_alt
0
dislike
68
views
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
Speak Answer
answered
Mar 20, 2018
by
anonymous
D.C. shunt motors are used for driving
machine tools.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Mar 20, 2018
by
anonymous
In case of D.C. shunt motors the speed is dependent on back e.m.f. only because?
Last answer:
In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.
dc
shunt
motors
speed
back
emf
thumb_up_alt
0
like
thumb_down_alt
0
dislike
146
views
1
answer
asked
Mar 20, 2018
by
anonymous
In D.C. shunt motors as load is reduced?
Last answer:
In D.C. shunt motors as load is reduced the speed will remain almost constant.
dc
shunt
motors
load
thumb_up_alt
0
like
thumb_down_alt
0
dislike
53
views
1
answer
asked
Mar 20, 2018
by
anonymous
Starters are used with D.C. motors because?
Last answer:
Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.
starters
used
dc
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
60
views
1
answer
asked
Mar 20, 2018
by
anonymous
Why are the D.C. motors preferred for traction applications?
Last answer:
The D.C. motors preferred for traction applications beacuse the speed is inversely proportional to the torque and the torque is proportional to square of armature current.
dc
motors
traction
applications
thumb_up_alt
0
like
thumb_down_alt
0
dislike
100
views
1
answer
asked
Mar 20, 2018
by
anonymous
During rheostat braking of D.C. series motors?
Last answer:
During rheostat braking of D.C. series motors motor is run as a generator.
rheostat
braking
dc
series
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?
Last answer:
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.
dc
shunt
motor
working
full
load
field
circuit
suddenly
opens
thumb_up_alt
0
like
thumb_down_alt
0
dislike
103
views
1
answer
asked
Mar 20, 2018
by
anonymous
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?
Last answer:
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.
speed
dc
shunt
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
111
views
1
answer
asked
Mar 20, 2018
by
anonymous
When two D.C. series motors are connected in parallel, the resultant speed is?
Last answer:
When two D.C. series motors are connected in parallel, the resultant speed is normal speed.
dc
series
motors
speed
thumb_up_alt
0
like
thumb_down_alt
0
dislike
305
views
1
answer
asked
Mar 20, 2018
by
anonymous
For a D.C. shunt motor if the excitation is changed?
Last answer:
For a D.C. shunt motor if the excitation is changed torque will change but power will remain constant.
dc
shunt
motor
excitation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
126
views
1
answer
asked
Apr 29, 2018
by
anonymous
Stepper motors are used in
Stepper motors are used in (1) printers (2) lifts (3) amplifiers (4) oscillators
Last answer:
Stepper motors are used in printers
stepper
motors
used
thumb_up_alt
0
like
thumb_down_alt
0
dislike
46
views
1
answer
asked
Mar 15, 2018
by
anonymous
What are the five types of single phase motors used in the industry?
What are the five types of single phase motors used in the industry?
five
types
single
phase
motors
used
industry
thumb_up_alt
0
like
thumb_down_alt
0
dislike
66
views
0
answers
asked
May 8, 2018
by
anonymous
A relay used for protection of motors against overload is :
A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay
Last answer:
A relay used for protection of motors against overload is : Thermal relay
relay
used
protection
motors
overload
thumb_up_alt
0
like
thumb_down_alt
0
dislike
236
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.6k
views
1
answer
asked
Mar 20, 2018
by
anonymous
In case of conductively compensated D.C. series motors, the compensating winding is provided?
Last answer:
In case of conductively compensated D.C. series motors, the compensating winding is provided in series with armature winding.
dc
motors
series
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
1
answer
asked
Mar 20, 2018
by
anonymous
Differentially compound D.C. motors can find applications requiring?
Last answer:
Differentially compound D.C. motors can find applications requiring low starting torque.
differentially
compound
dc
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
57
views
1
answer
asked
Mar 20, 2018
by
anonymous
The purpose of retardation test on D.C. shunt machines is to find out?
Last answer:
The purpose of retardation test on D.C. shunt machines is to find out stray losses.
dc
shunt
machines
thumb_up_alt
0
like
thumb_down_alt
0
dislike
58
views
1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor can be increased by?
Last answer:
The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.
speed
dc
shunt
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
88
views
1
answer
asked
Mar 20, 2018
by
anonymous
The armature torque of the D.C. shunt motor is proportional to?
Last answer:
The armature torque of the D.C. shunt motor is proportional to armature current.
armature
torque
dc
shunt
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
88
views
1
answer
asked
Mar 20, 2018
by
anonymous
As the load is increased the speed of D.C. shunt motor will?
Last answer:
As the load is increased the speed of D.C. shunt motor will reduce slightly.
load
increased
speed
dc
shunt
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
106
views
1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?
Last answer:
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.
dc
shunt
motor
conditions
maximum
power
current
armature
thumb_up_alt
0
like
thumb_down_alt
0
dislike
173
views
1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, speed is?
Last answer:
In a D.C. shunt motor, speed is independent of armature current.
dc
shunt
motor
speed
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor more than its full-load speed can be obtained by?
Last answer:
The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.
dc
shunt
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
91
views
1
answer
asked
Mar 20, 2018
by
anonymous
If the field of a D.C. shunt motor gets opened while motor is running?
Last answer:
If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.
field
dc
shunt
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
94
views
1
answer
asked
Sep 3, 2019
by
anonymous
Why are DC motors used in trains and not AC motors ?
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.
dc
motors
trains
ac
thumb_up_alt
0
like
thumb_down_alt
0
dislike
138
views
1
answer
asked
Mar 20, 2018
by
anonymous
The capacitors used in single-phase capacitor motors have no?
Last answer:
The capacitors used in single-phase capacitor motors have no polarity marking.
capacitors
used
single-phase
capacitor
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
105
views
1
answer
asked
Sep 6, 2018
by
anonymous
State the use of shunt and series resistance used in extension of meter.
State the use of shunt and series resistance used in extension of meter.
Last answer:
Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.
shunt
series
resistance
used
extension
meter
thumb_up_alt
0
like
thumb_down_alt
0
dislike
54
views
1
answer
asked
May 8, 2018
by
anonymous
Shunt compensation in an EHV line is used to
Shunt compensation in an EHV line is used to (A) Improve stability. (B) Improve the voltage profile. (C) Reduce the fault level. (D) Substitute for synchronous phase modifier.
Last answer:
Shunt compensation in an EHV line is used to Improve the voltage profile.
shunt
compensation
ehv
line
used
thumb_up_alt
0
like
thumb_down_alt
0
dislike
4.1k
views
1
answer
asked
Mar 15, 2018
by
anonymous
Why shunt capacitor is used?
Why shunt capacitor is used?
Last answer:
To improve voltage at receiving end and power factor
shunt
capacitor
used
thumb_up_alt
0
like
thumb_down_alt
0
dislike
63
views
1
answer
asked
Mar 20, 2018
by
anonymous
The wattage of motor for driving domestic sewing machine will be around?
Last answer:
The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.
wattage
motor
driving
domestic
sewing
machine
thumb_up_alt
0
like
thumb_down_alt
0
dislike
76
views
1
answer
asked
Mar 22, 2018
by
anonymous
The voltage used for suburban trains in D.C. system is usually?
Last answer:
The voltage used for suburban trains in D.C. system is usually 600 to 750 V.
voltage
used
suburban
trains
dc
system
usually
thumb_up_alt
0
like
thumb_down_alt
0
dislike
64
views
1
answer
asked
Mar 20, 2018
by
anonymous
The type of D.C. motor used for shears and punches is?
Last answer:
The type of D.C. motor used for shears and punches is cumulative compound D.C. motor.
type
dc
motor
used
shears
punches
thumb_up_alt
0
like
thumb_down_alt
0
dislike
101
views
1
answer
asked
Apr 29, 2018
by
anonymous
Which of the following motors can run on both AC and DC?
Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above
Last answer:
Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above
motors
ac
dc
thumb_up_alt
0
like
thumb_down_alt
0
dislike
113
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
108
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
1.5k
views
4
answers
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
79
views
2
answers
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
225
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
171
views
1
answer
asked
Mar 20, 2018
by
anonymous
In D.C. machines fractional pitch winding is used?
Last answer:
In D.C. machines fractional pitch winding is used to reduce the sparking.
dc
machines
fractional
pitch
winding
used
thumb_up_alt
0
like
thumb_down_alt
0
dislike
302
views
1
answer
asked
Mar 19, 2018
by
anonymous
D.C. shunt relays are made of?
D.C. shunt relays are made of?
Last answer:
D.C. shunt relays are made of many turns of thin wire.
d
c
shunt
relays
made
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.6k
views
1
answer
asked
Mar 20, 2018
by
anonymous
For which types of D.C. motor, dynamic braking is generally used ?
Last answer:
Shunt motors, Series motors, Compound motors
types
dc
motor
dynamic
braking
thumb_up_alt
1
like
thumb_down_alt
0
dislike
66
views
1
answer
asked
Mar 20, 2018
by
anonymous
In a manual shunt motor starter?
Last answer:
In a manual shunt motor starter over load relay is connected in series and no volt relay in parallel with the load.
manual
shunt
motor
starter
thumb_up_alt
0
like
thumb_down_alt
0
dislike
47
views
1
answer
asked
May 25, 2018
by
anonymous
Retardation test on d.c. shunt motors is performed for
Retardation test on d.c. shunt motors is performed for (a) frictional losses (b) stray losses (c) copper losses (d) iron loss
thumb_up_alt
0
like
thumb_down_alt
0
dislike
33
views
0
answers
asked
Apr 29, 2018
by
anonymous
In a dc machine, interpoles are used to
In a dc machine, interpoles are used to (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction
Last answer:
In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region
dc
machine
used
thumb_up_alt
0
like
thumb_down_alt
0
dislike
74
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
67
views
0
answers
asked
Aug 17, 2019
by
anonymous
State which electric motors are generally used in electro agro systems with reason.
State which electric motors are generally used in electro agro systems with reason.
Last answer:
1) 3 phase induction motor is used in electro agro system for water pumping from wells as 3 phase ac supply is easily available, cost of induction motor is less, maintenance free being rugged ... as 1 phase ac supply is easily available for domestic purpose, repair is simple and easily available.
electric
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
66
views
1
answer
asked
Mar 20, 2018
by
anonymous
A direct online starter is used for starting motors?
Last answer:
A direct online starter is used for starting motors up to 5 H.P.
direct
online
starter
starting
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
59
views
1
answer
asked
Jul 30, 2019
by
anonymous
What are the factors to be considered while selection of motors for different drives?
What are the factors to be considered while selection of motors for different drives?
Last answer:
Following Factors are considered while selecting electric drive (Motor) for particular application: Factors to be considered for selection of Electrical Drives: 1) Nature of Supply:- Whether supply ... , load equalization 7) Cost: - Capital, Running and maintenance cost should be less.
motors
different
drives
thumb_up_alt
0
like
thumb_down_alt
0
dislike
66
views
1
answer
asked
Mar 20, 2018
by
anonymous
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for?
Last answer:
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.
hysteresis
motors
mechanical
magnetic
vibrations
thumb_up_alt
0
like
thumb_down_alt
0
dislike
90
views
1
answer
asked
Mar 20, 2018
by
anonymous
The standard full-load power factor ratings for synchronous motors are?
Last answer:
The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.
standard
full-load
power
factor
ratings
synchronous
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
66
views
1
answer
asked
May 22, 2020
by
anonymous
Explain the necessity of starter for D.C. motor. State various types of D.C. motor starter.
Explain the necessity of starter for D.C. motor. State various types of D.C. motor starter.
Last answer:
Necessity of Starter for D.C. Motor: Armature current is given by equation Ia = (V−Eb)/Ra i) If the motor is at standstill or rest, back emf Eb is zero (as Eb= ZNP/(60A), at start speed N ... . Types of D.C. motor starters: i) Two point starter ii)Three point starter iii) Four point starter
starter
dc
motor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
81
views
1
answer
...