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

0.62.

0.72.

1.24.

0.25.

0.62.

0.72.

1.24.

0.25.

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Electrical Machines
Armature reaction depends on which of the following?

power factor of load

None of these

magnitude of load current

both 1 and 2

power factor of load

None of these

magnitude of load current

both 1 and 2

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

speed regulation.

efficiency.

starting torque.

running torque.

speed regulation.

efficiency.

starting torque.

running torque.

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

60°.

90°.

30°.

120°.

60°.

90°.

30°.

120°.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

load angle

synchronous reactance

excitation

both 1and 2

load angle

synchronous reactance

excitation

both 1and 2

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

improve and the speed rises.

deteriorate and the speed rises.

deteriorate and the speed falls.

improve and the speed falls.

improve and the speed rises.

deteriorate and the speed rises.

deteriorate and the speed falls.

improve and the speed falls.

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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 Armature reaction depends on which of the following?

Electrical Machines Eb/Vt ratio of a DC motor is an indication of

Electrical Machines What is the phase difference between two windings of A.C servomotor ?

Electrical Machines Maximum power developed in a cylindrical synchronous machine depends on

Electrical Machines In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

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
Armature reaction depends on which of the following?

Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will