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

15.6 Nm

16.55 Nm

15.28 Nm

15.92 Nm

15.6 Nm

16.55 Nm

15.28 Nm

15.92 Nm

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Electrical Machines
In case of 3 - ÃŽÂ¦ IM, plugging means

interchanging two supply phases for quick stopping.

starting the motor on load which is more than the rated load.

pulling the motor directly on line without a rotor.

locking of rotor due to harmonics.

interchanging two supply phases for quick stopping.

starting the motor on load which is more than the rated load.

pulling the motor directly on line without a rotor.

locking of rotor due to harmonics.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

any of the above.

less than primary.

greater than the primary.

equal to primary.

any of the above.

less than primary.

greater than the primary.

equal to primary.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

Differential compound motor.

Shunt motor.

Series motor.

Cumulative compound motor.

Differential compound motor.

Shunt motor.

Series motor.

Cumulative compound motor.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

increase by 5 %.

reduce by 5 %.

depend on other factors.

remain unchanged.

increase by 5 %.

reduce by 5 %.

depend on other factors.

remain unchanged.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

separately excited.

differentially compounded.

shunt connected.

cumulatively compounded.

separately excited.

differentially compounded.

shunt connected.

cumulatively compounded.

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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 In case of 3 - ÃŽÂ¦ IM, plugging means

Electrical Machines In a transformer, the frequency of a voltage at the secondary is

Electrical Machines In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

Electrical Machines If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

Electrical Machines For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

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
In case of 3 - ÃŽÂ¦ IM, plugging means

Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is