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The condition for maximum power in case of D.C. motor is?
asked
Mar 20, 2018
by
anonymous
condition
maximum
power
dc
motor
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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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169
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1
answer
asked
Mar 20, 2018
by
anonymous
The condition for maximum efficiency for a D.C. generator is?
Last answer:
The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.
condition
maximum
efficiency
dc
generator
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143
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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
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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144
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1
answer
asked
Apr 28, 2018
by
anonymous
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu
Last answer:
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu
maximum
reluctance
power
salient-pole
synchronous
motor
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71
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor has got maximum self relieving property ?
Last answer:
Series motor has got maximum self relieving property.
dc
motor
maximum
self
property
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128
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1
answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor will develop maximum power when the load angle is?
The synchronous motor will develop maximum power when the load angle is?
Last answer:
The synchronous motor will develop maximum power when the load angle is 900.
synchronous
motor
develop
maximum
power
load
angle
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80
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1
answer
asked
Sep 6, 2018
by
anonymous
State maximum power transfer theorem for DC circuit.
State maximum power transfer theorem for DC circuit.
Last answer:
Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.
maximum
power
transfer
theorem
dc
circuit
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72
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1
answer
asked
Jun 18, 2018
by
anonymous
A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case
A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of 600 C/W. If the ambient temperature is 300o C, then the maximum allowable power dissipation in the device will be A) 1.52 W B) 1.72 W C) 1.92W D) 2.00 W
Last answer:
A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of ... 300o C, then the maximum allowable power dissipation in the device will be 2.00 W
power
mosfet
maximum
junction
temperature
specification
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114
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1
answer
asked
Mar 20, 2018
by
anonymous
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?
Last answer:
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.
dc
series
motor
the
power
factor
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90
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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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146
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1
answer
asked
Mar 20, 2018
by
anonymous
In repulsion motor, maximum torque is developed when?
Last answer:
In repulsion motor, maximum torque is developed when brush axis is at 45° electrical to the field axis.
repulsion
motor
maximum
torque
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70
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1
answer
asked
Mar 20, 2018
by
anonymous
D.C. generators are normally designed for maximum efficiency around?
Last answer:
D.C. generators are normally designed for maximum efficiency around full-load.
dc
generators
normally
designed
maximum
efficiency
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69
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor has got maximum self loading property?
Last answer:
Differentially compounded D.C. motor has got maximum self loading property.
dc
motor
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60
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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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101
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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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117
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor is generally preferred for cranes and hoists ?
Last answer:
D.C. Series motor is generally preferred for cranes and hoists.
dc
motor
cranes
hoists
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
For starting a D.C. motor a starter is required because?
Last answer:
For starting a D.C. motor a starter is required because it limits the starting current to a safe value.
starting
dc
motor
starter
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62
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor is preferred for elevators ?
Last answer:
Cumulative compound D.C. motor is preferred for elevators.
dc
motor
preferred
elevators
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75
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1
answer
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
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0
answers
asked
Mar 20, 2018
by
anonymous
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent...
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit?
Last answer:
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit a resistance is connected in series with armature.
dc
motor
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113
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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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140
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1
answer
asked
Mar 18, 2018
by
anonymous
What is the maximum value of torque angle in synchronous motor?
What is the maximum value of torque angle in synchronous motor?
Last answer:
The maximum value of torque angle in synchronous motor is 90 degrees electrical.
maximum
torque
angle
synchronous
motor
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698
views
1
answer
asked
Mar 25, 2018
by
anonymous
For maximum transfer of power, internal resistance of the source should be?
For maximum transfer of power, internal resistance of the source should be?
Last answer:
For maximum transfer of power, internal resistance of the source should be equal to load resistance.
maximum
transfer
power
internal
resistance
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223
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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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107
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1
answer
asked
Mar 20, 2018
by
anonymous
Sparking at the commutator of a D.C. motor may result in?
Last answer:
Sparking at the commutator of a D.C. motor may result in damage to commutator segments, damage to commutator insulation, increased power consumption.
sparking
commutator
dc
motor
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109
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1
answer
asked
Mar 20, 2018
by
anonymous
Sparking, is discouraged in a D.C. motor because?
Last answer:
Sparking, is discouraged in a D.C. motor because commutator gets damaged.
sparking
discouraged
dc
motor
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94
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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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60
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1
answer
asked
Mar 20, 2018
by
anonymous
In a power plant if the maximum demand on the plant is equal to the plant capacity, then?
Last answer:
In a power plant if the maximum demand on the plant is equal to the plant capacity, then plant reserve capacity will be zero.
power
plant
maximum
demand
capacity
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96
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1
answer
asked
Mar 20, 2018
by
anonymous
At the instant of starting when a D.C. motor is put on supply, it behaves like?
Last answer:
At the instant of starting when a D.C. motor is put on supply, it behaves like a low resistance circuit.
dc
motor
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64
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature torque of the D.C. shunt motor is proportional to?
Last answer:
The armature torque of the D.C. shunt motor is proportional to armature current.
armature
torque
dc
shunt
motor
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86
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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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105
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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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301
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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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69
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1
answer
asked
Mar 20, 2018
by
anonymous
The starting resistance of a D.C. motor is generally?
Last answer:
The starting resistance of a D.C. motor is generally low.
starting
resistance
dc
motor
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76
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1
answer
asked
Mar 20, 2018
by
anonymous
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
Last answer:
By looking at Commutator part of the motor, it can be easily confirmed that a particular motor is D.C. motor.
motor
dc
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79
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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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92
views
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
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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292
views
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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75
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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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111
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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 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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49
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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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374
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor more than its full-load speed can be obtained by?
Last answer:
The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.
dc
shunt
motor
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90
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1
answer
asked
Mar 20, 2018
by
anonymous
The direction of rotation of a D.C. series motor can be changed by?
Last answer:
The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.
direction
rotation
dc
series
motor
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75
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1
answer
asked
Mar 19, 2018
by
anonymous
What is the maximum value of power factor?
What is the maximum value of power factor?
Last answer:
1 is the maximum value of power factor.
maximum
value
power
factor
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79
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1
answer
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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93
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1
answer
asked
Mar 20, 2018
by
anonymous
A D.C. series motor is that which?
Last answer:
A D.C. series motor is that which has its field winding consisting of thick wire and less turns.
dc
series
motor
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1
answer
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