A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

6 V

234 V

474 V

240 V

6 V

234 V

474 V

240 V

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

Operating speed.

Starting torque.

Full load current.

Starting torque, operating speed, full load current.

Operating speed.

Starting torque.

Full load current.

Starting torque, operating speed, full load current.

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

10 Ω

50 Ω

0.1 Ω

100 Ω

10 Ω

50 Ω

0.1 Ω

100 Ω

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

the rotating stator flux and rotor flux.

magnetizing electric current and back emf.

the supply voltage and the back emf.

None of these

the rotating stator flux and rotor flux.

magnetizing electric current and back emf.

the supply voltage and the back emf.

None of these

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Electrical Machines
Tap changer is generally provided in

earthing transformer.

voltage transformer.

power transformer.

current transformer.

earthing transformer.

voltage transformer.

power transformer.

current transformer.

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

1/2 times maximum value of flux due to any phase

equal to φm, where φm is the maximum flux due to any phase

3 times maximum value of flux due to any phase

3/2 times maximum value of flux due to any phase

1/2 times maximum value of flux due to any phase

equal to φm, where φm is the maximum flux due to any phase

3 times maximum value of flux due to any phase

3/2 times maximum value of flux due to any phase

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Electrical Machines

Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

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

Electrical Machines The field divertor resistance for a DC series motor is of order of

Electrical Machines The torque angle, in a synchronous motor, is the angle between

Electrical Machines Tap changer is generally provided in

Electrical Machines In the 3-phase induction motor, the resultant flux is of a constant nature and is

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

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

Electrical Machines
The field divertor resistance for a DC series motor is of order of

Electrical Machines
The torque angle, in a synchronous motor, is the angle between

Electrical Machines
Tap changer is generally provided in

Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is