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
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

1.24.

0.62.

0.72.

0.25.

1.24.

0.62.

0.72.

0.25.

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Electrical Machines
In a DC generator, the armature reaction results in

demagnetization of leading & magnetization of trailing pole tip.

magnetization of leading and demagnetization of trailing pole tip.

magnetization of inter poles.

demagnetization of centers of poles.

demagnetization of leading & magnetization of trailing pole tip.

magnetization of leading and demagnetization of trailing pole tip.

magnetization of inter poles.

demagnetization of centers of poles.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

back emf is equal to applied voltage.

Back emf is equal to half of applied voltage.

None of above.

Back emf is equal.

back emf is equal to applied voltage.

Back emf is equal to half of applied voltage.

None of above.

Back emf is equal.

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Electrical Machines
With the increase in speed of DC motor

Both back emf as well as line current fall.

Back emf falls and line current increase.

Both back emf as well as line current increase.

Back emf increase but line current falls.

Both back emf as well as line current fall.

Back emf falls and line current increase.

Both back emf as well as line current increase.

Back emf increase but line current falls.

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Electrical Machines
In shapers and slotters which motor are preferred?

Synchronous motor.

Slip ring IM.

Double cage motor.

Squirrel cage IM.

Synchronous motor.

Slip ring IM.

Double cage motor.

Squirrel cage IM.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

6 ohms.

2.2 ohms.

5.7 ohms.

1.9 ohms.

6 ohms.

2.2 ohms.

5.7 ohms.

1.9 ohms.

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Electrical Machines

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 In a DC generator, the armature reaction results in

Electrical Machines When the mechanical power is developed by a DC motor maximum

Electrical Machines With the increase in speed of DC motor

Electrical Machines In shapers and slotters which motor are preferred?

Electrical Machines A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

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
In a DC generator, the armature reaction results in

Electrical Machines
When the mechanical power is developed by a DC motor maximum

Electrical Machines
With the increase in speed of DC motor

Electrical Machines
In shapers and slotters which motor are preferred?

Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is