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The speed of a universal motor is generally reduced by using?
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asked
Mar 20, 2018
by
anonymous
speed
universal
motor
reduced
using
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1
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answered
Mar 20, 2018
by
anonymous
The speed of a universal motor is generally reduced by using
gear trains
.
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asked
Mar 20, 2018
by
anonymous
The speed of a universal motor is usually reduced by using?
Last answer:
The speed of a universal motor is usually reduced by using gearing.
speed
universal
motor
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78
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1
answer
asked
Mar 20, 2018
by
anonymous
Speed control of a universal motor is achieved by?
Last answer:
Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.
speed
control
universal
motor
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77
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed control of universal motor used for sewing machines is by?
Last answer:
The speed control of universal motor used for sewing machines is by varying the resistance.
speed
control
universal
motor
used
sewing
machines
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed/load characteristics of a universal motor is same as that of?
Last answer:
The speed/load characteristics of a universal motor is same as that of D.C. series motor.
speed
load
characteristics
universal
motor
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69
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1
answer
asked
Mar 20, 2018
by
anonymous
A universal motor can run on?
Last answer:
A universal motor can run on either A.C. or D.C.
universal
motor
run
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49
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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 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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59
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0
answers
asked
Mar 20, 2018
by
anonymous
In a universal motor, the most common cause of brush sparking is?
Last answer:
In a universal motor, the most common cause of brush sparking is open armature winding, shorted armature winding, shorted field winding, high commutator mica.
universal
motor
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100
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1
answer
asked
Mar 20, 2018
by
anonymous
A universal motor is one which?
Last answer:
A universal motor is one which can be operated either on D.C. or A.C. supply at approximately the same speed and output.
universal
motor
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1
answer
asked
Aug 17, 2019
by
anonymous
State working principle of universal motor with the help of diagram.
State working principle of universal motor with the help of diagram.
Last answer:
Working Principle of Universal motor : It is modified DC series motor which can work on AC as well as DC supply. According to basic motor principle, whenever a current carrying conductor is placed in magnetic ... They have nearly same operating characteristic for both AC and DC supply.
universal
motor
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56
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1
answer
asked
Aug 17, 2019
by
anonymous
applications of each: i) Universal motor ii) Stepper motor.
applications of each: i) Universal motor ii) Stepper motor.
Last answer:
i) Applications of Universal motor: 1) portable drills 2) hair dryers 3) grinders 4) mixers 5) table-fans 6) blowers 7) polishers 8) Kitchen appliances ii) Applications of Stepper motor ... 7) robotics 8) CNC machine 9) Control systems 10) Biomedical applications 10) XY recorder 11) plotters
universal
motor
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1
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asked
Jul 26, 2019
by
anonymous
State two applications of 1) Shaded pole motor 2) Universal motor
State two applications of 1) Shaded pole motor 2) Universal motor
Last answer:
(i)Applications of Shaded pole motor: 1. Small fans 2. Toy motors 3. Hair dryers 4. Ventilators 5. Electric clocks 6. Record players 7. Motorized valves 8. Gramophones 9. Photocopying ... 5. Portable Drilling Machines 6. Electric Shavers 7. Mechanical computing Machines 8. Machine Tools etc.
applications
shaded
pole
motor
universal
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97
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1
answer
asked
Jul 20, 2019
by
anonymous
Draw and explain working of universal motor. Give two applications of universal motor.
Draw and explain working of universal motor. Give two applications of universal motor.
Last answer:
Figure of Universal motor: Operation of universal motor on A.C. and D.C. supply: *A universal motor works on either DC or single phase AC supply. When the universal motor is ... , regardless of AC or DC supply, universal motor works on the same principle that DC series motor works.
universal
motor
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254
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4
answers
asked
Oct 13, 2019
by
anonymous
Speed control of the motor using TRIAC
Speed control of the motor using TRIAC
Last answer:
Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.
speed
control
motor
triac
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209
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1
answer
asked
May 1, 2018
by
anonymous
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last answer:
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases
speed
three-phase
induction
motor
controlled
variable
voltage
frequency
control
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118
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1
answer
asked
Apr 28, 2018
by
anonymous
The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min
The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm
Last answer:
The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 rpm
speed
2-pole
3-phase
stepper
motor
operated
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121
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. motor can be controlled by varying
The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
Last answer:
The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
speed
dc
motor
varying
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115
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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
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88
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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
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
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111
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. series motor is?
Last answer:
The speed of a D.C. series motor is inversely proportional to the armature current.
speed
series
motor
dc
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71
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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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87
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1
answer
asked
Mar 20, 2018
by
anonymous
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.?
Last answer:
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C. compound motor.
speed
torque
characteristic
repulsion
induction
motor
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69
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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
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62
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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
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1
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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
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225
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1
answer
asked
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 15, 2018
by
anonymous
How do you measure the speed of a motor?
How do you measure the speed of a motor?
measure
speed
motor
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0
answers
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
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 15, 2018
by
anonymous
Why the speed of synchronous motor is constant?
Why the speed of synchronous motor is constant?
speed
synchronous
motor
constant
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54
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0
answers
asked
Mar 18, 2018
by
anonymous
An electric motor in which both stator field and rotor rotates with same speed is called?
An electric motor in which both stator field and rotor rotates with same speed is called?
Last answer:
An electric motor in which both stator field and rotor rotates with same speed is called synchronous motor.
electric
motor
stator
field
rotor
rotates
speed
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92
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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
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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
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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70
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1
answer
asked
Dec 16, 2017
by
anonymous
What are the speed control methods of dc motor?
What are the speed control methods of dc motor?
Last answer:
Field control of DC motor Armature control of DC motor
speed
control
methods
dc
motor
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150
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2
answers
asked
Aug 9, 2017
by
anonymous
speed control methods of three phase induction motor?
speed control methods of three phase induction motor?
Last answer:
Speed control of three phase induction motor
speed
control
phase
induction
motor
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196
views
2
answers
asked
Mar 20, 2018
by
anonymous
Which motor has the poorest speed control?
Last answer:
Series motor has the poorest speed control.
motor
poorest
speed
control
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79
views
1
answer
asked
Mar 20, 2018
by
anonymous
For the same H.P. rating and full load speed, following motor has poor starting torque?
Last answer:
For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.
hp
rating
full
load
speed
motor
poor
starting
torque
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115
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1
answer
asked
Mar 15, 2018
by
anonymous
Which motor has the best speed regulation?
Which motor has the best speed regulation?
motor
speed
regulation
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44
views
0
answers
asked
Mar 20, 2018
by
anonymous
In variable speed motor?
Last answer:
In variable speed motor a weaker commutating field is needed at low speed than at high speed.
variable
speed
motor
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45
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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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59
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1
answer
asked
Apr 28, 2018
by
anonymous
Corona loss in transmission lines can be reduced by
Corona loss in transmission lines can be reduced by (A) using small diameter conductors (B) using bundled conductors (C) using less spacing between conductors (D) increasing the transmission line voltage
Last answer:
Corona loss in transmission lines can be reduced by using bundled conductors
corona
loss
transmission
lines
reduced
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95
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1
answer
asked
Apr 28, 2018
by
anonymous
In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an
In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is (A) 0.2 Ω (B) 0.3 Ω (C) 0.4 Ω (D) 0.5 Ω
Last answer:
In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is 0.3 Ω
slip-ring
induction
motor
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103
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1
answer
asked
Mar 10, 2018
by
anonymous
How can power loss be reduced?
How can power loss be reduced?
power
loss
reduced
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61
views
0
answers
asked
Mar 26, 2018
by
anonymous
Under constant load conditions, the speed of a d.c. motor is affected by?
Under constant load conditions, the speed of a d.c. motor is affected by?
Last answer:
Under constant load conditions, the speed of a d.c. motor is affected by field flux.
speed
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208
views
1
answer
asked
Mar 21, 2018
by
anonymous
A universal RLC bridge uses?
Last answer:
A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.
universal
rlc
bridge
uses
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221
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1
answer
asked
Apr 28, 2018
by
anonymous
In an adjustable speed ac drive which quantity gets reduced above rated speed ?
In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
Last answer:
In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
adjustable
speed
ac
drive
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76
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1
answer
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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142
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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
...