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What will happen if you increase the current in the motor?
Speak Question
asked
Mar 15, 2018
by
anonymous
What will happen if you increase the current in the motor?
increase
current
motor
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1
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answered
Jun 1, 2019
by
prasadnani
Increasing current means increasing frequency of the motor because current is directly proportional to rotations of the motor rotor
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Related questions
asked
Mar 10, 2018
by
anonymous
Why does increase in current mean a decrease in voltage?
Why does increase in current mean a decrease in voltage?
Last answer:
This is because current flows from high potential to low potential to bring the two diffrent potential to unity , thus a reduced potential (voltage)
increase
current
decrease
voltage
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1
answer
asked
Mar 14, 2018
by
anonymous
How can we increase the induced current?
How can we increase the induced current?
Last answer:
Induced current can be increased by reducing no of windings on the secondary part compared to primary.
increase
induced
current
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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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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
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175
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1
answer
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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378
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1
answer
asked
Mar 14, 2018
by
anonymous
What are three ways you can increase the strength of an electromagnet?
What are three ways you can increase the strength of an electromagnet?
three
ways
increase
strength
electromagnet
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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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173
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1
answer
asked
Mar 20, 2018
by
anonymous
Locked rotor current of a shaded pole motor is?
Last answer:
Locked rotor current of a shaded pole motor is slightly more than full load current.
locked
rotor
current
shaded
pole
motor
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1
answer
asked
Aug 18, 2019
by
anonymous
What will happen if the induction motor runs at synchronous speed ?
What will happen if the induction motor runs at synchronous speed ?
Last answer:
Since there is always slip present in rotor it cannot run at synchronous speed no current will be developed hence no torque will developed
induction
motor
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3
answers
asked
Mar 20, 2018
by
anonymous
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to?
Last answer:
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 25% of the previous value.
dc
motor
series
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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 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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1
answer
asked
Mar 15, 2018
by
anonymous
Why does induction motor have high starting current?
Why does induction motor have high starting current?
Last answer:
In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor
induction
motor
high
starting
current
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2
answers
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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1
answer
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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2
answers
asked
Mar 19, 2018
by
anonymous
For given applied voltage, with the increase in frequency of the applied voltage?
For given applied voltage, with the increase in frequency of the applied voltage?
Last answer:
For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.
voltage
increase
frequency
applied
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177
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1
answer
asked
Mar 19, 2018
by
anonymous
Reduction in core losses and increase in permeability are obtained with transformer employing?
Reduction in core losses and increase in permeability are obtained with transformer employing?
Last answer:
Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.
reduction
core
losses
increase
permeability
obtained
transformer
employing
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1
answer
asked
May 1, 2018
by
anonymous
In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will
In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times
Last answer:
In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth
induction
motor
flux
density
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214
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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
If a D.C. motor is connected across the A.C. supply it will?
Last answer:
If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.
dc
motor
connected
ac
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. series motor is operated on A.C. supply, it will?
Last answer:
If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.
dc
series
motor
operated
ac
supply
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64
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1
answer
asked
Mar 14, 2018
by
anonymous
What happens when you reverse the direction of the current in an electromagnet?
What happens when you reverse the direction of the current in an electromagnet?
Last answer:
When you reverse current direction in an electromagnet, the magnetic poles will also change.
reverse
direction
current
electromagnet
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79
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1
answer
asked
May 8, 2018
by
anonymous
A change of 4% in the supply voltage to an induction motor will produce a change of approximately
A change of 4% in the supply voltage to an induction motor will produce a change of approximately
Last answer:
A change of 4% in the supply voltage to an induction motor will produce a change of approximately 8% in the rotor torque
supply
voltage
induction
motor
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197
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1
answer
asked
Mar 20, 2018
by
anonymous
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will?
Last answer:
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will remain unchanged.
dc
motor
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148
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1
answer
asked
Mar 20, 2018
by
anonymous
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be?
Last answer:
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be less than 50%.
dc
motor
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96
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1
answer
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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1
answer
asked
Mar 20, 2018
by
anonymous
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in?
Last answer:
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.
synchronous
speed
motor
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69
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1
answer
asked
Jun 18, 2018
by
anonymous
If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be
If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55
Last answer:
If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98
bjt
emitter
current
common
base
gain
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150
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1
answer
asked
May 8, 2018
by
anonymous
If the % reactance upto the fault point is 20%, then the short circuit current will be
If the % reactance upto the fault point is 20%, then the short circuit current will be
Last answer:
If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current
reactance
fault
point
short
circuit
current
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1
answer
asked
Apr 29, 2018
by
anonymous
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be
Last answer:
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be 10 A
fault
current
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277
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1
answer
asked
Mar 20, 2018
by
anonymous
In a differentially compounded D.C. motor, if shunt field suddenly opens?
Last answer:
In a differentially compounded D.C. motor, if shunt field suddenly opens the motor will first stop and then run in opposite direction as series motor.
dc
motor
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70
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1
answer
asked
May 8, 2018
by
anonymous
In a series R-C circuit, with the increase in frequency, current
In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero
Last answer:
In a series R-C circuit, with the increase in frequency, current Increases
series
r-c
circuit
frequency
current
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72
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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
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106
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1
answer
asked
Mar 20, 2018
by
anonymous
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be?
Last answer:
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be cumulatively compounded.
dc
motor
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294
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1
answer
asked
Mar 20, 2018
by
anonymous
The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?
Last answer:
The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.
mechanical
power
shunt
motor
maximum
ratio
back
emf
voltage
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146
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
Last answer:
Cumulatively compounded D.C. motor will be suitable along with flywheel for intermittent light and heavy loads.
dc
motor
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108
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1
answer
asked
Mar 20, 2018
by
anonymous
The current drawn by the armature of D.C. motor is directly proportional to?
Last answer:
The current drawn by the armature of D.C. motor is directly proportional to the torque required.
dc
motor
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307
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1
answer
asked
Mar 20, 2018
by
anonymous
The direction of rotation of universal motor can be reversed the by reversing the flow of current through?
Last answer:
The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.
direction
rotation
universal
motor
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104
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1
answer
asked
Apr 29, 2018
by
anonymous
Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to
Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be
Last answer:
Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be 25 N -m
torque
three-phase
induction
motor
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91
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor?
Last answer:
If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.
ambient
temperature
motor
dc
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75
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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
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126
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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
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94
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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
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
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1
answer
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 20, 2018
by
anonymous
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens?
Last answer:
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses.
dc
motor
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96
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. motor is to be selected for conveyors, which motor would be preferred ?
Last answer:
If a D.C. motor is to be selected for conveyors, Series motor would be preferred.
motor
conveyors
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81
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1
answer
asked
Mar 3, 2018
by
anonymous
What is mean by plugging in three phase induction motor?
What is mean by plugging in three phase induction motor?
Last answer:
Plugging in three-phase induction motor means interchanging of any two phases of a stator for quick stopping.
plugging
three
phase
induction
motor
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1
answer
asked
May 22, 2018
by
anonymous
If the current in the armature of do series motor is reduced to 5%, the torque of the motor will become:
If the current in the armature of do series motor is reduced to 5%, the torque of the motor will become: (1) 50% of the previous value (2) 25% of the previous value (3) 150% of the previous value (4) 125% of the previous value
Last answer:
If the current in the armature of do series motor is reduced to 5%, the torque of the motor will become: 25% of the previous value
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asked
5 days
ago
by
anonymous
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ? (1) Increase (2) Dacrease (3) Remain constant (4) Will increase first and then dcrease
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ? (1) Increase (2) Dacrease (3) Remain constant (4) Will increase first and then dcrease
Last answer:
Increase
physics
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