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In split-phase motor auxiliary winding is of?
asked
Mar 20, 2018
by
anonymous
split-phase
motor
auxiliary
winding
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1
Answer
answered
Mar 20, 2018
by
anonymous
In split-phase motor auxiliary winding is of
thin wire placed at the top of the slots.
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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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1
answer
asked
Mar 20, 2018
by
anonymous
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to?
Last answer:
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.
capacitor
start
run
motors
function
running
series
auxiliary
winding
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1
answer
asked
Mar 20, 2018
by
anonymous
In a split phase motor, the running winding should have?
Last answer:
In a split phase motor, the running winding should have low resistance and high inductance.
split
phase
motor
running
winding
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1
answer
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
split-phase
induction
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
In split phase motor main winding is of?
Last answer:
In split phase motor main winding is of thick wire placed at the bottom of the slots.
split
phase
motor
main
winding
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1
answer
asked
Mar 20, 2018
by
anonymous
In a capacitor start motor, the phase displacement between starting and running winding can be nearly?
Last answer:
In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.
capacitor
start
motor
phase
displacement
between
starting
running
winding
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1
answer
asked
Mar 20, 2018
by
anonymous
The running winding of a single phase motor on testing with meggar is found to be ground...
The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?
Last answer:
The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.
running
winding
single
phase
motor
testing
meggar
ground
location
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1
answer
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.
ac
series
motor
compensating
winding
employed
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90
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1
answer
asked
Mar 20, 2018
by
anonymous
A centrifugal switch is used to disconnect starting winding when motor has?
Last answer:
A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.
centrifugal
switch
used
disconnect
starting
winding
motor
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186
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1
answer
asked
Mar 20, 2018
by
anonymous
The starting winding of a single-phase motor is placed in?
Last answer:
The starting winding of a single-phase motor is placed in stator.
starting
winding
single-phase
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
If starting winding of a single-phase induction motor is left in the circuit, it will?
Last answer:
If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.
starting
winding
single-phase
induction
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a?
Last answer:
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.
starting
winding
single
phase
motor
refrigerator
disconnected
circuit
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1
answer
asked
Mar 20, 2018
by
anonymous
The purpose of stator winding in the compensated repulsion motor is to?
Last answer:
The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.
purpose
stator
winding
compensated
repulsion
motor
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1
answer
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
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1
answer
asked
May 8, 2018
by
anonymous
Damper winding in a synchronous motor
Damper winding in a synchronous motor
Last answer:
Damper winding in a synchronous motor Serves to start the motor.
damper
winding
synchronous
motor
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1
answer
asked
Mar 3, 2018
by
anonymous
In synchronous motor, does the winding losses vary with load?
In synchronous motor, does the winding losses vary with load?
Last answer:
No, in the synchronous motor the winding losses do not vary with load.
synchronous
motor
winding
losses
vary
load
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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
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1
answer
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
In a split phase motor?
Last answer:
In a split phase motor the starting winding is connected through a centrifugal switch.
split
phase
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
Direction of rotation of a split phase motor can be reversed by reversing the connection of?
Last answer:
Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.
direction
rotation
split
phase
motor
reversed
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139
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1
answer
asked
Sep 1, 2019
by
anonymous
What is the purpose of auxiliary controller in substation?
What is the purpose of auxiliary controller in substation?
Last answer:
The systems of substation auxiliaries ensure operation of substations providing internal consumers of substations with operating direct and alternating currents. Any breakdown (loss) of auxiliary systems ... whole substation, as well as serious problems during its subsequent putting into operation.
auxiliary
controller
substation
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60
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1
answer
asked
Jul 25, 2019
by
anonymous
Explain auxiliary commutation with a neat diagram. Also draw its waveform.
Explain auxiliary commutation with a neat diagram. Also draw its waveform.
Last answer:
Auxiliary Commutation At start, the Ta is triggered and turned on to carry the load current. Due to the resonant circuit R-L-C, the current initially rises, attains peak and then falls to ... , the firing of auxiliary SCR commutates the main SCR, hence name is auxiliary commutation.
auxiliary
commutation
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107
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1
answer
asked
Mar 19, 2018
by
anonymous
Which type of winding is used in 3 phase shell-type transformer ?
Last answer:
Sandwich type winding is used in 3 phase shell-type transformer.
type
winding
used
phase
shell-type
transformer
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108
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1
answer
asked
Apr 29, 2018
by
anonymous
Damper winding is provided in 3 phase synchronous motors to :
Damper winding is provided in 3 phase synchronous motors to :
Last answer:
Damper winding is provided in 3 phase synchronous motors to : provide starting torque and prevent hunting
damper
winding
3-phase
synchronous
motors
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69
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1
answer
asked
Sep 20, 2018
by
anonymous
Split phase induction motor
Split phase induction motor
Last answer:
Split phase induction motor : There are two windings used in split phase induction motor. It is a type of single-phase induction motor. There are two winding one is called main winding and ... motor have low starting torque it is used for small fans, blowers, centrifugal pumps, grinders etc.
split
phase
induction
motor
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178
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1
answer
asked
Mar 20, 2018
by
anonymous
In a shaded pole single-phase motor, the revolving field is produced by the use of?
Last answer:
In a shaded pole single-phase motor, the revolving field is produced by the use of shading coils.
shaded
pole
single-phase
motor
field
use
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85
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1
answer
asked
Mar 20, 2018
by
anonymous
In a capacitor start single-phase motor, when capacitor is replaced by a resistance?
Last answer:
In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.
capacitor
start
single-phase
motor
resistance
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81
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1
answer
asked
Mar 26, 2018
by
anonymous
The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?
The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?
Last answer:
The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.
induction
motor
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64
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1
answer
asked
Mar 20, 2018
by
anonymous
In a single phase motor the centrifugal switch?
Last answer:
In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.
single
phase
motor
centrifugal
switch
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1
answer
asked
Mar 20, 2018
by
anonymous
The power factor of a single-phase induction motor is usually?
Last answer:
The power factor of a single-phase induction motor is usually lagging.
power
factor
single-phase
induction
motor
usually
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99
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1
answer
asked
Mar 20, 2018
by
anonymous
If the capacitor of a single-phase motor is short-circuited?
Last answer:
If the capacitor of a single-phase motor is short-circuited the motor will not start.
capacitor
single-phase
motor
short-circuited
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83
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1
answer
asked
Mar 20, 2018
by
anonymous
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on?
Last answer:
Reason is kinetic energy
single
phase
induction
motor
disconnected
supply
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2
answers
asked
Mar 20, 2018
by
anonymous
A single-phase induction motor is?
Last answer:
A single-phase induction motor is inherently non-self-starting with low torque.
single-phase
induction
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by...
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?
Last answer:
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.
capacitor-start
single
phase
induction
motor
switched
supply
capacitor
inductor
equivalent
reactance
value
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100
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1
answer
asked
Mar 20, 2018
by
anonymous
The rotor developed by a single-phase motor at starting is?
Last answer:
The rotor developed by a single-phase motor at starting is zero.
rotor
developed
single-phase
motor
starting
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55
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1
answer
asked
Mar 20, 2018
by
anonymous
In the case of lap winding resultant pitch is?
Last answer:
In the case of lap winding resultant pitch is difference of front and back pitches.
case
lap
winding
resultant
pitch
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86
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1
answer
asked
Mar 20, 2018
by
anonymous
In case of D.C. machine winding, number of commutator segments is equal to?
Last answer:
In case of D.C. machine winding, number of commutator segments is equal to number of armature coils.
machine
winding
dc
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251
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1
answer
asked
Mar 20, 2018
by
anonymous
In lap winding, the number of brushes is always?
Last answer:
In lap winding, the number of brushes is always same as the number of poles.
lap
winding
number
brushes
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275
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1
answer
asked
Mar 20, 2018
by
anonymous
The short circuit in any winding of the transformer is the result of?
Last answer:
The short circuit in any winding of the transformer is the result of impulse voltage.
short
circuit
winding
transformer
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129
views
1
answer
asked
Mar 20, 2018
by
anonymous
In D.C. generators, lap winding is used for?
Last answer:
In D.C. generators, lap winding is used for low voltage, high current.
lap
winding
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60
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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
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301
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1
answer
asked
Mar 20, 2018
by
anonymous
Single phase induction motor usually operates on?
Last answer:
Single phase induction motor usually operates on 0.6 power factor lagging.
single
phase
induction
motor
operates
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97
views
1
answer
asked
May 7, 2020
by
anonymous
State advantages of short pitch winding over full pitch winding in alternators.
State advantages of short pitch winding over full pitch winding in alternators.
Last answer:
Advantages of Short Pitch Winding over Full Pitch Winding in Alternators: 1) Short pitching reduces the amount of copper needed for end connection when compared with full pitched coil. 2) They ... reduced, thereby increasing the efficiency. 4) The power quality of generated emf is improved.
state
advantages
of
short
pitch
winding
over
full
in
alternators
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211
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1
answer
asked
May 8, 2018
by
anonymous
A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts
A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts
Last answer:
A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts
transformer
secondary
winding
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92
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1
answer
asked
May 8, 2018
by
anonymous
A _________ is used to measure the stator % winding temperature of the generator.
A _________ is used to measure the stator % winding temperature of the generator. (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer
Last answer:
A Resistance thermometer is used to measure the stator % winding temperature of the generator.
used
measure
stator
winding
temperature
generator
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2.9k
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1
answer
asked
Apr 29, 2018
by
anonymous
Aluminium is not used as winding wire for the armature of a dc machine because
Aluminium is not used as winding wire for the armature of a dc machine because (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper
Last answer:
Aluminium is not used as winding wire for the armature of a dc machine because (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper
aluminium
winding
wire
armature
dc
machine
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477
views
1
answer
asked
Mar 21, 2018
by
anonymous
Wave winding is composed of?
Last answer:
Wave winding is composed of that even number which is exact multiple of poles + 2.
wave
winding
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56
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1
answer
asked
Mar 21, 2018
by
anonymous
Lap winding is composed of?
Last answer:
Lap winding is composed of any even number of conductors.
lap
winding
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79
views
1
answer
asked
Jul 27, 2019
by
anonymous
What is armature winding?
Last answer:
It is the wire wound around a aluminium metal it is found commonly in transformers or motors
armature
winding
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82
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1
answer
asked
Mar 20, 2018
by
anonymous
In case of a shaded pole motor the direction of rotation of the motor is?
Last answer:
In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.
shaded
pole
motor
direction
rotation
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106
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1
answer
...