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
Which method is less recommendable for induction motor starting in the industries?

Auto transformer starting.

Direct online starting.

Stator resistance starting.

Rotor resistance starting.

Auto transformer starting.

Direct online starting.

Stator resistance starting.

Rotor resistance starting.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

T is independent of P

T∝ P²

T∝ P

T∝ P³

T is independent of P

T∝ P²

T∝ P

T∝ P³

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

Brush.

Commutator.

Yoke.

Armature.

Brush.

Commutator.

Yoke.

Armature.

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Electrical Machines
A DC series motor must started on no load because it would

Fail to start without load.

Not develop starting torque.

Draw more current without producing sufficient torque.

Run at dangerously high speed.

Fail to start without load.

Not develop starting torque.

Draw more current without producing sufficient torque.

Run at dangerously high speed.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

decrease

increase

None of these

either increase or decrease

decrease

increase

None of these

either increase or decrease

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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 Which method is less recommendable for induction motor starting in the industries?

Electrical Machines In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

Electrical Machines In DC generator, which component plays the vital role to produce the direct current?

Electrical Machines A DC series motor must started on no load because it would

Electrical Machines In dc motors, under leading pole tips flux density 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
Which method is less recommendable for induction motor starting in the industries?

Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

Electrical Machines
A DC series motor must started on no load because it would

Electrical Machines
In dc motors, under leading pole tips flux density will--------?