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The speed control of universal motor used for sewing machines is by?
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asked
Mar 20, 2018
by
anonymous
speed
control
universal
motor
used
sewing
machines
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answered
Mar 20, 2018
by
anonymous
The speed control of universal motor used for sewing machines is by
varying the resistance.
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Related questions
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 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
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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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a universal motor is generally reduced by using?
Last answer:
The speed of a universal motor is generally reduced by using gear trains.
speed
universal
motor
reduced
using
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70
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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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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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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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198
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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
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1
answer
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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210
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1
answer
asked
Mar 20, 2018
by
anonymous
The wattage of motor for driving domestic sewing machine will be around?
Last answer:
The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.
wattage
motor
driving
domestic
sewing
machine
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76
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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
Mar 20, 2018
by
anonymous
Speed control by Ward Leonard method gives uniform speed variation?
Last answer:
Speed control by Ward Leonard method gives uniform speed variation in both directions.
speed
control
ward
leonard
method
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102
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1
answer
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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101
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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
Mar 20, 2018
by
anonymous
Usually wide and sensitive speed control is desired in case of?
Last answer:
Usually wide and sensitive speed control is desired in case of colliery winders.
sensitive
speed
control
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107
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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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303
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1
answer
asked
Mar 20, 2018
by
anonymous
In Ward-Leonard control the lower limit of speed is imposed by?
Last answer:
In Ward-Leonard control the lower limit of speed is imposed by residual magnetism of the generator.
ward-leonard
control
speed
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61
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1
answer
asked
Mar 20, 2018
by
anonymous
For constant torque drive which speed control method is preferred ?
Last answer:
For constant torque drive armature voltage control speed control method is preferred.
constant
torque
drive
speed
control
method
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88
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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
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
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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52
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1
answer
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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98
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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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255
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4
answers
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 25, 2018
by
anonymous
Silicon steel is used in electrical machines because it has?
Silicon steel is used in electrical machines because it has?
Last answer:
Silicon steel is used in electrical machines because it has low hysteresis loss.
silicon
steel
used
electrical
machines
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137
views
1
answer
asked
Mar 20, 2018
by
anonymous
The armature voltage control of D.C. motor provides?
Last answer:
The armature voltage control of D.C. motor provides constant torque drive.
armature
voltage
control
motor
dc
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50
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1
answer
asked
Aug 9, 2017
by
anonymous
Armature control of DC motor
Armature control of DC motor
Last answer:
Armature control of DC motor
armature
control
dc
motor
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127
views
2
answers
asked
Aug 9, 2017
by
anonymous
Field control of DC motor
Field control of DC motor
Last answer:
Field control of DC motor
field
control
dc
motor
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92
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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
views
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 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 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
views
1
answer
asked
Apr 26, 2018
by
anonymous
Regulating-transformers are used in power systems for control of
Regulating-transformers are used in power systems for control of
Last answer:
Regulating-transformers are used in power systems for control of power flow
regulating-transformers
used
power
systems
control
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119
views
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
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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228
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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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140
views
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 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 20, 2018
by
anonymous
The type of D.C. motor used for shears and punches is?
Last answer:
The type of D.C. motor used for shears and punches is cumulative compound D.C. motor.
type
dc
motor
used
shears
punches
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102
views
1
answer
asked
Mar 20, 2018
by
anonymous
The motor used for the compressors is?
Last answer:
The motor used for the compressors is capacitor-start capacitor-run motor.
motor
used
compressors
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45
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1
answer
asked
Mar 20, 2018
by
anonymous
The shaded pole motor is used for?
Last answer:
The shaded pole motor is used for low starting torque.
shaded
pole
motor
used
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40
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1
answer
asked
Apr 30, 2018
by
anonymous
A differentiator is not usually used in control system, because it : -
A differentiator is not usually used in control system, because it : - (A) reduces damping (B) increases error (C) reduces gain margin (D) increases input noise
Last answer:
A differentiator is not usually used in control system, because it : - increases input noise
differentiator
used
control
system
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58
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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 10, 2018
by
anonymous
What are the electromagnetic waves used in remote control?
What are the electromagnetic waves used in remote control?
electromagnetic
waves
used
remote
control
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55
views
0
answers
asked
Mar 20, 2018
by
anonymous
The electric motor used in portable drills is?
Last answer:
The electric motor used in portable drills is universal motor.
electric
motor
used
portable
drills
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35
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1
answer
asked
Aug 18, 2019
by
anonymous
What type of motor is used for drilling machines?
What type of motor is used for drilling machines?
Last answer:
universal motor also used in Handheld power tools, blowers, blenders, vacuum cleaners, polishers and kitchen appliances.universal motor is defined as a motor which may be operated either on direct or single phase AC supply at approximately the same speed and output
drilling
machines
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76
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1
answer
...