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For constant torque drive which speed control method is preferred ?
asked
Mar 20, 2018
by
anonymous
constant
torque
drive
speed
control
method
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1
Answer
answered
Mar 20, 2018
by
anonymous
For constant torque drive
a
rmature voltage control
speed control method is preferred.
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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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100
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1
answer
asked
Sep 6, 2018
by
anonymous
Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.
Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.
Last answer:
A)Spring control method: As shown in the figure, the inner ends of the both springs are attahced to the spindle, while outer end of upper spring is attached to the lever and outer ... of spring material: 1.Non Magnetic material 2.Low specific resistance 3.Low temperature coefficient of resistance
spring
control
controlling
torque
measuring
instrument
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519
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1
answer
asked
Mar 20, 2018
by
anonymous
The main disadvantage of the Ward-Leonard control method is?
Last answer:
The main disadvantage of the Ward-Leonard control method is high initial cost, high maintenance cost, low efficiency at light loads.
disadvantage
ward-leonard
control
method
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58
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1
answer
asked
Mar 20, 2018
by
anonymous
The maximum constant load torque under which a synchronous motor will pull into synchronism...
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?
Last answer:
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.
maximum
constant
load
torque
synchronous
motor
synchronism
rated
rotor
supply
voltage
frequency
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213
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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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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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74
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1
answer
asked
Apr 28, 2018
by
anonymous
The meter which does not have any component in it to provide control torque is
The meter which does not have any component in it to provide control torque is (A) Electrodynamometer for current measurement (B) Electrodynamometer for voltage measurement (C) Electrodynamometer for power measurement. (D) Electrodynamometer for power factor measurement.
Last answer:
The meter which does not have any component in it to provide control torque is Electrodynamometer for power factor measurement.
meter
control
torque
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118
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1
answer
asked
Sep 29, 2018
by
anonymous
Draw and explain bulk correction method for power factor & control.
Draw and explain bulk correction method for power factor & control.
Last answer:
Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95).
bulk
correction
method
power
factor
control
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90
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1
answer
asked
Sep 6, 2018
by
anonymous
Write one advantage and one disadvantage each for spring control method and gravity control method.
Write one advantage and one disadvantage each for spring control method and gravity control method.
Last answer:
Advantages of Spring Control Method: 1) The spring-controlled meters may be used in any position. 2) In some instruments, springs can be used as current leads. 3) As springs are light in weight ... only. 2) Scale is non-uniform. 3) Control weights add to the weight of instrument.
advantage
disadvantage
spring
method
gravity
control
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348
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2
answers
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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114
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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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53
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0
answers
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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68
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1
answer
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
May 3, 2020
by
anonymous
Illustrate with neat wiring diagram a single lamp control by two point method.
Illustrate with neat wiring diagram a single lamp control by two point method.
Last answer:
Single lamp control by two point method: This system is commonly used for stair case wiring. It consists of two way switches (the switch operates always in one of the two possible positions) the ... the person will change the position of switch S2, so that the lamp will be switched OFF'.
illustrate
with
neat
wiring
diagram
a
single
lamp
control
by
two
point
method
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72
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1
answer
asked
Sep 5, 2018
by
anonymous
Explain spring control method with neat diagram.
Explain spring control method with neat diagram.
Last answer:
Spring Control Method: As shown in the figure the inner ends of the both springs are attahced to the spindle ,while outer end of upper spring is attached to the lever and outer end of ... the springs are twisted in opposite direction to the motion of pointer and produce controlling torque.
spring
control
method
diagram
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246
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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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68
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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
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
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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76
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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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208
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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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191
views
2
answers
asked
May 20, 2018
by
anonymous
For speed control of ac drive, the preferred method using thyristors is
For speed control of ac drive, the preferred method using thyristors is A) Phase control B) Integral cycle control C) Single pulse PWM control D) Sinusoidal PWM control
Last answer:
For speed control of ac drive, the preferred method using thyristors is Sinusoidal PWM control
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221
views
1
answer
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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200
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1
answer
asked
Mar 20, 2018
by
anonymous
Regenerative method of braking is based on that?
Last answer:
Regenerative method of braking is based on that back e.m.f. is equal to the applied voltage.
regenerative
method
braking
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69
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1
answer
asked
Mar 26, 2018
by
anonymous
The shaft torque of a d.c. motor is less than its armature ...
The shaft torque of a d.c. motor is less than its armature torque because of .......... losses.
Last answer:
The shaft torque of a d.c. motor is less than its armature torque because of rotational losses.
shaft
torque
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176
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1
answer
asked
Mar 26, 2018
by
anonymous
The maximum torque of d.c. motors is limited by?
The maximum torque of d.c. motors is limited by?
Last answer:
The maximum torque of d.c. motors is limited by commutation.
maximum
torque
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291
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1
answer
asked
Jul 6, 2019
by
anonymous
Adjustable-speed drive
Adjustable-speed drive
Last answer:
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adjustable-speed
drive
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58
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1
answer
asked
Mar 20, 2018
by
anonymous
Torque developed by a D.C. motor depends upon?
Last answer:
Torque developed by a D.C. motor depends upon magnetic field, active length of the conductor, current flow through the conductors, number of conductors, radius of armature.
torque
developed
dc
motor
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249
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1
answer
asked
Mar 19, 2018
by
anonymous
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
Last answer:
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.
transformer
voltage
losses
constant
load
changes
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102
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1
answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
Last answer:
The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.
synchronous
motor
leading
power
factor
drive
mechanical
load
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69
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1
answer
asked
Mar 20, 2018
by
anonymous
Ward-Leonard control is basically a?
Last answer:
Ward-Leonard control is basically a voltage control method.
ward-leonard
control
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34
views
1
answer
asked
Mar 11, 2018
by
anonymous
What is the need for electrically isolated drive circuits?
What is the need for electrically isolated drive circuits?
electrically
isolated
drive
circuits
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56
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0
answers
asked
Mar 20, 2018
by
anonymous
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?
maximum
torque
synchronous
motor
rated
stator
supply
voltage
frequency
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86
views
0
answers
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 25, 2018
by
anonymous
The time constant of the capacitance circuit is defined as the time during which voltage?
The time constant of the capacitance circuit is defined as the time during which voltage?
Last answer:
The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.
time
constant
capacitance
circuit
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87
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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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2.5k
views
1
answer
asked
May 6, 2020
by
anonymous
Give the expression for ABCD constant of T model.
Give the expression for ABCD constant of T model.
Last answer:
Expression for ABCD constants of T model:
give
the
expression
for
abcd
constant
of
t
model
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50
views
1
answer
asked
Jul 2, 2019
by
anonymous
Time constant for RC circuit formula
Time constant for RC circuit formula τ = RC Where, τ = time constant
Last answer:
Time constant for RC circuit formula τ = RC Where, τ = time constant
time
constant
for
rc
circuit
formula
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0
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89
views
1
answer
asked
Mar 19, 2018
by
anonymous
For a transformer, operating at constant load current, maximum efficiency will occur at?
For a transformer, operating at constant load current, maximum efficiency will occur at?
Last answer:
For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.
transformer
operating
constant
load
current
maximum
efficiency
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89
views
1
answer
asked
Mar 20, 2018
by
anonymous
Which method of braking is generally used in elevators ?
Last answer:
Plugging method of braking is generally used in elevators.
method
braking
elevators
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51
views
1
answer
asked
Mar 18, 2018
by
anonymous
Salient pole rotor is use for which speed?
Salient pole rotor is use for which speed?
Last answer:
Salient pole rotor is use for low and medium speed prime movers.
salient
pole
rotor
use
speed
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71
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1
answer
asked
Mar 18, 2018
by
anonymous
Which rotor is use for high speed in turbo alternators?
Which rotor is use for high speed in turbo alternators?
Last answer:
Non-salient pole rotor is used for high speed in turbo alternators.
rotor
use
high
speed
turbo
alternators
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65
views
1
answer
asked
Apr 26, 2018
by
anonymous
The bridge method commonly used for finding mutual inductance is
The bridge method commonly used for finding mutual inductance is (A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge
Last answer:
The bridge method commonly used for finding mutual inductance is Heaviside Campbell bridge
bridge
method
mutual
inductance
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594
views
1
answer
asked
Apr 28, 2018
by
anonymous
Torque angle for the synchronous machine is the angle between
Torque angle for the synchronous machine is the angle between (A) stator magnetic field and rotor magnetic field (B) stator magnetic field and net magnetic field in the air gap (C) rotor magnetic field and net magnetic field in the air gap (D) excitation voltage and impedance voltage drop
Last answer:
Torque angle for the synchronous machine is the angle between rotor magnetic field and net magnetic field in the air gap
torque
angle
synchronous
machine
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71
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1
answer
asked
Mar 10, 2018
by
anonymous
What is the difference between AC and DC drive?
What is the difference between AC and DC drive?
Last answer:
AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz
difference
between
ac
dc
drive
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132
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1
answer
asked
Mar 10, 2018
by
anonymous
What is an electric motor drive?
What is an electric motor drive?
electric
motor
drive
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54
views
0
answers
asked
Mar 10, 2018
by
anonymous
What is a drive in electrical controls?
What is a drive in electrical controls?
drive
electrical
controls
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61
views
0
answers
asked
Apr 9, 2018
by
anonymous
Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method...
Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: (1) Better speed regulation (2) Less loss in external resistance (3) Simplicity in control circuit (4) Reduced cost of controller
Last answer:
Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: Better speed regulation.
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142
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1
answer
asked
Sep 13, 2017
by
anonymous
which single phase induction motor has highest starting torque?
Last answer:
Capacitor start motor has high torque in starting
induction
motor
torque
starting
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answer
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