A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

36.36% increase

36.36% decrease

36.36% increase

18.18% increase

36.36% increase

36.36% decrease

36.36% increase

18.18% increase

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

Starting torque.

Full load current.

Operating speed.

Starting torque, operating speed, full load current.

Starting torque.

Full load current.

Operating speed.

Starting torque, operating speed, full load current.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

pole chamfering

All of these

pole stacking

compensating winding

pole chamfering

All of these

pole stacking

compensating winding

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

0.25.

1.24.

0.62.

0.72.

0.25.

1.24.

0.62.

0.72.

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Electrical Machines
The 3 - ÃŽÂ¦ induction motors are, by a very considerable margin, the most widely used AC motors as

they have very good speed regulation.

they have maximum efficiency and maximum starting torque.

these are cheaper in cost, simple and rugged in construction.

they are capable of operation under range of leading and lagging pf.

they have very good speed regulation.

they have maximum efficiency and maximum starting torque.

these are cheaper in cost, simple and rugged in construction.

they are capable of operation under range of leading and lagging pf.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

Power factor and field current.

Armature current and torque.

Torque and field current.

Armature current and field current.

Power factor and field current.

Armature current and torque.

Torque and field current.

Armature current and field current.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines If the source voltage of a DC motor is increased, which of the following will decrease?

Electrical Machines Which of the following is/are the methods to reduce the armature reaction and its effects?

Electrical Machines A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines The 3 - ÃŽÂ¦ induction motors are, by a very considerable margin, the most widely used AC motors as

Electrical Machines In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines
The 3 - ÃŽÂ¦ induction motors are, by a very considerable margin, the most widely used AC motors as

Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively