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If the capacitor of a single-phase motor is short-circuited?
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asked
Mar 20, 2018
by
anonymous
capacitor
single-phase
motor
short-circuited
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1
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answered
Mar 20, 2018
by
anonymous
If the capacitor of a single-phase motor is short-circuited
the motor will not start.
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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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82
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1
answer
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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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178
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1
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Mar 20, 2018
by
anonymous
In capacitor start single-phase motors?
Last answer:
In capacitor start single-phase motors current in the starting winding leads the voltage.
capacitor
start
single-phase
motors
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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 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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102
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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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86
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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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56
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1
answer
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
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
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105
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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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131
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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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186
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1
answer
asked
Sep 2, 2019
by
anonymous
Why is a capacitor used in a single phase motor and not in three phase motor ?
Why is a capacitor used in a single phase motor and not in three phase motor ?
Last answer:
In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.
capacitor
single
three
phase
motor
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6
answers
asked
Jul 30, 2019
by
anonymous
Explain the working of a single phase capacitor start induction motor.
Explain the working of a single phase capacitor start induction motor.
Last answer:
Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc
single
phase
capacitor
start
induction
motor
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2
answers
asked
Mar 20, 2018
by
anonymous
In a two value capacitor motor, the capacitor used for running purposes is?
Last answer:
In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.
two
value
capacitor
motor
used
running
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81
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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
The value of starting capacitor of a fractional horse power motor will be?
Last answer:
The value of starting capacitor of a fractional horse power motor will be 300 uF .
value
starting
capacitor
fractional
horse
power
motor
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77
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1
answer
asked
Apr 29, 2018
by
anonymous
In a single-phase induction motor, the operating direction is determined by the ________
In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these
Last answer:
In a single-phase induction motor, the operating direction is determined by the Starting circuit
single-phase
induction
motor
operating
direction
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78
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1
answer
asked
Apr 28, 2018
by
anonymous
In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then
In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor
Last answer:
In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then the flux first decreases and then increases in the same direction
single-phase
induction
motor
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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 19, 2018
by
anonymous
The secondary of a current transformer is always short-circuited under operating conditions because it?
The secondary of a current transformer is always short-circuited under operating conditions because it?
Last answer:
The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.
secondary
current
transformer
short-circuited
operating
conditions
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then?
Last answer:
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.
centrifugal
switch
capacitor
motor
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90
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1
answer
asked
Mar 20, 2018
by
anonymous
To reverse the direction of rotation of a capacitor start motor while it is running we should?
Last answer:
To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.
rotation
capacitor
start
motor
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80
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1
answer
asked
Mar 20, 2018
by
anonymous
In a ceiling fan employing capacitor run motor?
Last answer:
In a ceiling fan employing capacitor run motor secondary winding surrounds the primary winding.
ceiling
fan
capacitor
run
motor
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85
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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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77
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1
answer
asked
Mar 20, 2018
by
anonymous
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because?
Last answer:
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because it has low starting as well as running currents at relatively high power factor.
capacitor
motor
application
compressor
home
air
conditioners
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59
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1
answer
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May 22, 2018
by
anonymous
A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited stator is:
A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited stator is: (1) Slip frequency (2) Supply frequency (3) Frequency corresponding to rotor speed (4) Zero
Last answer:
A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited stator is: Slip frequency
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581
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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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85
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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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131
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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
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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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437
views
1
answer
asked
Apr 28, 2018
by
anonymous
In a single-phase transformer, the magnetizing current is
In a single-phase transformer, the magnetizing current is (A) in phase with the no-load current (B) in quadrature with the no-load current (C) the product of no-load current and power factor (D) in phase with the flux in the core
Last answer:
In a single-phase transformer, the magnetizing current is in phase with the flux in the core
single-phase
transformer
magnetizing
current
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64
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1
answer
asked
Mar 20, 2018
by
anonymous
If a single phase induction motor runs slower than normal, the most likely defect is?
Last answer:
If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.
single
phase
induction
motor
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108
views
1
answer
asked
Apr 29, 2018
by
anonymous
A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be
A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be
Last answer:
A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be triangular
single-phase
voltage
source
square-wave
inverter
feeds
pure
inductive
load
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509
views
1
answer
asked
Apr 29, 2018
by
anonymous
When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a
When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is
Last answer:
When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2
firing
angle
single-phase
fully
controlled
rectifier
feeding
constant
direct
current
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244
views
1
answer
asked
Apr 28, 2018
by
anonymous
The sequence components of current of a single-phase load connected to a 3-phase system are
The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero
Last answer:
The sequence components of current of a single-phase load connected to a 3-phase system are equal positive, negative and zero sequence components
sequence
components
current
single-phase
load
connected
3-phase
system
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394
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1
answer
asked
May 17, 2018
by
anonymous
For a single phase capacitor start induction motor, which of the following statements is valid?
For a single phase capacitor start induction motor, which of the following statements is valid? A) The capacitor is used for power factor improvement B) The direction of rotation can be changed by reversing the main winding terminals C) The direction of rotation cannot be changed D) The direction of rotation can be changed by interchanging the supply terminals
Last answer:
For a single phase capacitor start induction motor, which of the following statements is valid? A) The capacitor is used for power factor improvement B) The direction of rotation can be ... cannot be changed D) The direction of rotation can be changed by interchanging the supply terminals
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280
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1
answer
asked
Apr 28, 2018
by
anonymous
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V
Last answer:
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V
phase
controlled
single-phase
full-controlled
scr
bridge
converter
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114
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1
answer
asked
Apr 28, 2018
by
anonymous
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load,
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses
Last answer:
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses
single-phase
scr
bridge
converter
operating
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119
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1
answer
asked
Apr 28, 2018
by
anonymous
A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred
A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is (A) 216 V (B) 226 V (C) 234 V (D) 236 V
Last answer:
A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is 226 V
single-phase
transformer
operating
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85
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1
answer
asked
Apr 29, 2018
by
anonymous
An additional condition for parallel operation of three-phase transformers over single-phase transformers is that
An additional condition for parallel operation of three-phase transformers over single-phase transformers is that
Last answer:
An additional condition for parallel operation of three-phase transformers over single-phase transformers is that the transformers should belong to the same vector group
parallel
operation
three-phase
transformers
single-phase
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83
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1
answer
asked
Oct 13, 2019
by
anonymous
Single-phase mid-point controlled rectifier with RL load
Single-phase mid-point controlled rectifier with RL load
Last answer:
Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.
single-phase
mid-point
controlled
rectifier
rl
load
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100
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1
answer
asked
Oct 13, 2019
by
anonymous
Single-phase Midpoint controlled rectifier with Resistive load
Single-phase Midpoint controlled rectifier with Resistive load
Last answer:
Single-phase Midpoint controlled rectifier with Resistive load: 1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.
single-phase
midpoint
controlled
rectifier
resistive
load
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215
views
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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116
views
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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65
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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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146
views
1
answer
asked
Mar 21, 2018
by
anonymous
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is?
Last answer:
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.
capacitor
leads
voltage
loss
angle
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109
views
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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69
views
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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49
views
1
answer
asked
Mar 20, 2018
by
anonymous
In split-phase motor auxiliary winding is of?
Last answer:
In split-phase motor auxiliary winding is of thin wire placed at the top of the slots.
split-phase
motor
auxiliary
winding
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46
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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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131
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2
answers
...