The condition for maximum power in case of D.C. motor is?

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asked Mar 20, 2018 by anonymous

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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.

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169 views 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.

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143 views 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%.

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96 views 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.

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144 views 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

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71 views 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.

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128 views 1 answer

asked Mar 18, 2018 by anonymous

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.

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asked Sep 6, 2018 by anonymous

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.

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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

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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.

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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.

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146 views 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.

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70 views 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.

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69 views 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.

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60 views 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.

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101 views 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.

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75 views 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.

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117 views 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.

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75 views 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.

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62 views 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.

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75 views 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?

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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.

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113 views 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.

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140 views 1 answer

asked Mar 18, 2018 by anonymous

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.

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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?

Last answer: For maximum transfer of power, internal resistance of the source should be equal to load resistance.

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223 views 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.

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107 views 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.

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109 views 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.

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94 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.

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60 views 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.

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96 views 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.

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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.

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86 views 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.

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105 views 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.

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301 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.

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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.

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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.

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79 views 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.

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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.

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70 views 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.

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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.

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75 views 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

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111 views 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.

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88 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.

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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.

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374 views 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.

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90 views 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.

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75 views 1 answer

asked Mar 19, 2018 by anonymous

What is the maximum value of power factor?

Last answer: 1 is the maximum value of power factor.

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79 views 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.

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93 views 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.

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51 views 1 answer

The condition for maximum power in case of D.C. motor is?

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