A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

16.55 Nm

15.92 Nm

15.28 Nm

15.6 Nm

16.55 Nm

15.92 Nm

15.28 Nm

15.6 Nm

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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 external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

31.1 Ω

15.1 Ω

31.9 Ω

15.9 Ω

31.1 Ω

15.1 Ω

31.9 Ω

15.9 Ω

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

rotor winding.

either stator winding or rotor winding.

None of these

stator winding.

rotor winding.

either stator winding or rotor winding.

None of these

stator winding.

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Electrical Machines
The type of DC motor generally used for shears and punches is

Shunt motor.

Series motor.

Differential compound motor.

Cummulative compound motor.

Shunt motor.

Series motor.

Differential compound motor.

Cummulative compound motor.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

increasing input power of the prime mover.

increasing armature resistance.

increasing terminal voltage.

increasing armature cooling.

increasing input power of the prime mover.

increasing armature resistance.

increasing terminal voltage.

increasing armature cooling.

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Electrical Machines
The mmf produced by rotor currents of a 3 - ÃŽÂ¦ induction motor

rotates at slip speed with respect to stator mmf.

rotates at synchronous speed with respect to rotor.

rotates at the speed of rotor in the air gap.

is at standstill with respect to stator mmf.

rotates at slip speed with respect to stator mmf.

rotates at synchronous speed with respect to rotor.

rotates at the speed of rotor in the air gap.

is at standstill with respect to stator mmf.

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Electrical Machines

Electrical Machines A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

Electrical Machines Rotating magnetic field is produced in an induction motor because of

Electrical Machines The type of DC motor generally used for shears and punches is

Electrical Machines The change in speed of a DC generator due to increased load is corrected by

Electrical Machines The mmf produced by rotor currents of a 3 - ÃŽÂ¦ induction motor

Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

Electrical Machines
Rotating magnetic field is produced in an induction motor because of

Electrical Machines
The type of DC motor generally used for shears and punches is

Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

Electrical Machines
The mmf produced by rotor currents of a 3 - ÃŽÂ¦ induction motor