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The duration of sudden short-circuit test on a synchronous motor is usually about?
asked
Mar 20, 2018
by
anonymous
short-circuit
test
synchronous
motor
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1
Answer
answered
Mar 20, 2018
by
anonymous
The duration of sudden short-circuit test on a synchronous motor is usually about
one second.
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Related questions
asked
Mar 20, 2018
by
anonymous
A synchronous machine with low value of short-circuit ratio has?
Last answer:
A synchronous machine with low value of short-circuit ratio has lower stability limit.
synchronous
machine
low
value
short-circuit
ratio
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
In case one phase of a three-phase synchronous motor is short-circuited the motor will?
Last answer:
In case one phase of a three-phase synchronous motor is short-circuited the motor will not start.
one
phase
three-phase
synchronous
motor
short-circuited
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171
views
1
answer
asked
Mar 20, 2018
by
anonymous
The efficiency of a properly designed synchronous motor will usually fall in range?
Last answer:
The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.
efficiency
designed
synchronous
motor
usually
range
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1
answer
asked
Mar 20, 2018
by
anonymous
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then?
Last answer:
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.
synchronous
motor
synchronised
supply
running
load
negligible
loss
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1
answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
Last answer:
The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.
synchronous
motor
leading
power
factor
drive
mechanical
load
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69
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1
answer
asked
Mar 18, 2018
by
anonymous
If we change the excitation of synchronous machine will it affect on motor speed?
If we change the excitation of synchronous machine will it affect on motor speed?
Last answer:
No, If we change the excitation of synchronous machine it will not affect on motor speed.
change
excitation
synchronous
machine
affect
motor
speed
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68
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1
answer
asked
Mar 18, 2018
by
anonymous
The back emf of synchronous motor depends on?
The back emf of synchronous motor depends on?
Last answer:
The back emf of synchronous motor depends on load angle.
back
emf
synchronous
motor
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47
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1
answer
asked
Mar 20, 2018
by
anonymous
The operating speed of a synchronous motor can be changed to new fixed value by?
Last answer:
The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.
operating
speed
synchronous
motor
fixed
value
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83
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1
answer
asked
Mar 20, 2018
by
anonymous
The size of a synchronous motor decreases with the increase in?
Last answer:
The size of a synchronous motor decreases with the increase in flux density.
size
synchronous
motor
decreases
increase
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132
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1
answer
asked
Mar 20, 2018
by
anonymous
The construction of a synchronous motor resembles?
Last answer:
The construction of a synchronous motor resembles an alternator.
construction
synchronous
motor
resembles
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1
answer
asked
Mar 20, 2018
by
anonymous
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?
maximum
torque
synchronous
motor
rated
stator
supply
voltage
frequency
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86
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0
answers
asked
Mar 20, 2018
by
anonymous
If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will?
Last answer:
If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.
field
winding
unloaded
salient
pole
synchronous
motor
open
circuited
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115
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1
answer
asked
Mar 20, 2018
by
anonymous
The coupling angle or load angle of synchronous motor is defined as the angle between the?
Last answer:
The coupling angle or load angle of synchronous motor is defined as the angle between the rotor and the stator poles of opposite polarity.
coupling
angle
load
synchronous
motor
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135
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1
answer
asked
Mar 18, 2018
by
anonymous
What is the maximum value of torque angle in synchronous motor?
What is the maximum value of torque angle in synchronous motor?
Last answer:
The maximum value of torque angle in synchronous motor is 90 degrees electrical.
maximum
torque
angle
synchronous
motor
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698
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1
answer
asked
Mar 18, 2018
by
anonymous
If the load of the normally excited synchronous motor is increased the power factor will?
If the load of the normally excited synchronous motor is increased the power factor will?
Last answer:
If the load of the normally excited synchronous motor is increased the power factor will become lagging.
load
normally
excited
synchronous
motor
increased
power
factor
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79
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1
answer
asked
Mar 18, 2018
by
anonymous
If the field of synchronous motor is under excited, power factor will be?
If the field of synchronous motor is under excited, power factor will be?
Last answer:
If the field of synchronous motor is under excited, power factor will be lagging.
field
synchronous
motor
excited
power
factor
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144
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1
answer
asked
Mar 20, 2018
by
anonymous
A synchronous motor has better power factor as compared to that of an equivalent induction motor...
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
Last answer:
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.
synchronous
power
factor
equivalent
induction
motor
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86
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1
answer
asked
Mar 20, 2018
by
anonymous
In a synchronous motor, the armature current has large values for?
Last answer:
In a synchronous motor, the armature current has large values for high and low excitation.
synchronous
motor
armature
current
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1
answer
asked
Mar 20, 2018
by
anonymous
The maximum constant load torque under which a synchronous motor will pull into synchronism...
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?
Last answer:
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.
maximum
constant
load
torque
synchronous
motor
synchronism
rated
rotor
supply
voltage
frequency
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213
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1
answer
asked
Apr 16, 2020
by
anonymous
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
explain
the
need
and
steps
to
conduct
reduced
voltage
running
up
test
on
three
phase
induction
motor
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57
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0
answers
asked
Mar 18, 2018
by
anonymous
The damping winding in synchronous motor is generally used to?
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.
damping
winding
synchronous
motor
used
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118
views
1
answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor will develop maximum power when the load angle is?
The synchronous motor will develop maximum power when the load angle is?
Last answer:
The synchronous motor will develop maximum power when the load angle is 900.
synchronous
motor
develop
maximum
power
load
angle
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80
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1
answer
asked
Mar 20, 2018
by
anonymous
Slip-rings in a synchronous motor carry?
Last answer:
Slip-rings in a synchronous motor carry direct current.
slip-rings
synchronous
motor
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75
views
1
answer
asked
Mar 20, 2018
by
anonymous
A synchronous motor running with normal excitation adjusts to load increases essentially by increase in?
Last answer:
A synchronous motor running with normal excitation adjusts to load increases essentially by increase in armature current.
synchronous
motor
running
normal
excitation
load
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87
views
1
answer
asked
Mar 20, 2018
by
anonymous
A synchronous motor can develop synchronous torque?
Last answer:
A synchronous motor can develop synchronous torque at synchronous speed.
synchronous
motor
develop
torque
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76
views
1
answer
asked
Mar 18, 2018
by
anonymous
A synchronous motor can be made self starting by providing?
A synchronous motor can be made self starting by providing?
Last answer:
A synchronous motor can be made self-starting by providing damper bar.
synchronous
motor
made
self
starting
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93
views
1
answer
asked
Mar 18, 2018
by
anonymous
In a synchronous motor which losses varies with load?
In a synchronous motor which losses varies with load?
Last answer:
In a synchronous motor, copper losses varies with load.
synchronous
motor
losses
varies
load
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62
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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.
centrifugal
switch
disconnects
auxiliary
winding
motor
synchronous
speed
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139
views
1
answer
asked
Mar 20, 2018
by
anonymous
The armature current of the synchronous motor?
Last answer:
The armature current of the synchronous motor has large values for low and high excitation.
armature
current
synchronous
motor
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67
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1
answer
asked
Mar 18, 2018
by
anonymous
How can we reverse the direction of rotation of synchronous motor?
How can we reverse the direction of rotation of synchronous motor?
Last answer:
By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.
reverse
direction
rotation
synchronous
motor
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183
views
1
answer
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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2
answers
asked
Mar 18, 2018
by
anonymous
An unexcited single phase synchronous motor is ?
An unexcited single phase synchronous motor is ?
Last answer:
An unexcited single-phase synchronous motor is reluctance motor.
unexcited
single
phase
synchronous
motor
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83
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1
answer
asked
Mar 18, 2018
by
anonymous
what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?
what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?
Last answer:
When excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor will stop.
excitation
unloaded
salient
pole
synchronous
motor
disconnected
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270
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1
answer
asked
Mar 18, 2018
by
anonymous
Can we use the synchronous motor as the synchronous capacitor?
Can we use the synchronous motor as the synchronous capacitor?
Last answer:
Yes, we can use the synchronous motor as the synchronous capacitor when the synchrnous motor is overexcited.
use
synchronous
motor
capacitor
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76
views
1
answer
asked
Mar 18, 2018
by
anonymous
Which motor have more efficiency, synchronous motor or induction motor?
Which motor have more efficiency, synchronous motor or induction motor?
Last answer:
Synchronous motor has more efficiency.
efficiency
synchronous
induction
motor
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61
views
1
answer
asked
Mar 18, 2018
by
anonymous
Hunting in synchronous motor cannot be due to?
Hunting in synchronous motor cannot be due to?
Last answer:
Hunting in synchronous motor cannot be due to windage friction.
hunting
synchronous
motor
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74
views
1
answer
asked
Mar 18, 2018
by
anonymous
Synchronous motor always runs at which speed?
Synchronous motor always runs at which speed?
Last answer:
Synchronous motor always runs at synchronous speed.
synchronous
motor
always
runs
speed
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55
views
1
answer
asked
Mar 18, 2018
by
anonymous
Three phase synchronous motor will have how many sliprings?
Three phase synchronous motor will have how many sliprings?
Last answer:
Three phase synchronous motor will have two sliprings.
three
phase
synchronous
motor
slipring
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63
views
1
answer
asked
Apr 28, 2018
by
anonymous
The effect of increasing load on a synchronous motor running with normal excitation is
The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.
Last answer:
The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor
effect
load
synchronous
motor
running
normal
excitation
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393
views
1
answer
asked
Mar 19, 2018
by
anonymous
Short circuit test on transformers is conducted to determine?
Last answer:
Short circuit test on transformers is conducted to determine copper losses.
short
circuit
test
transformers
conducted
determine
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106
views
1
answer
asked
Apr 27, 2020
by
anonymous
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
explain
the
procedure
to
perform
short
circuit
test
on
single
phase
transformer
with
diagram
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68
views
0
answers
asked
Mar 20, 2018
by
anonymous
An over excited synchronous motor on noload is known as?
Last answer:
An over excited synchronous motor on noload is known as synchronous condenser.
over
excited
synchronous
motor
noload
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55
views
1
answer
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
Mar 20, 2018
by
anonymous
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will?
Last answer:
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.
reluctance
motor
synchronous
speed
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87
views
1
answer
asked
Apr 29, 2018
by
anonymous
The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)
The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents
Last answer:
The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only
armature
current
symmetrical
phase
short
circuit
synchronous
machine
salient
pole
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112
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1
answer
asked
Apr 30, 2018
by
anonymous
The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :
The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :
Last answer:
The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to : Z (p.u)
ratio
full-load
volt-amperes
short-circuit
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91
views
1
answer
asked
Sep 27, 2017
by
anonymous
in short circuit test of transformer which side is short circuited?
Last answer:
Low voltage side is short circuited.
transformer
short
circuit
test
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140
views
1
answer
asked
Sep 27, 2017
by
anonymous
in short circuit test of transformer which side is low voltage side and which side is high voltage side?
Last answer:
Primary is high voltage side and Secondary is low Voltage side.
transformer
circuit
test
short
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97
views
1
answer
asked
Apr 28, 2018
by
anonymous
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu
Last answer:
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu
maximum
reluctance
power
salient-pole
synchronous
motor
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71
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1
answer
asked
Dec 31, 2017
by
anonymous
The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?
The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?
Last answer:
Ns equals f/pair pole 50/4 - 12.5
induction
motor
synchronous
speed
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119
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2
answers
...