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

15.92 Nm

15.6 Nm

15.28 Nm

16.55 Nm

15.92 Nm

15.6 Nm

15.28 Nm

16.55 Nm

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Electrical Machines
Cogging in induction motor occurs when

number of stator teeth - number of rotor teeth = odd number.

number of stator teeth - number of rotor teeth = 0.

number of stator teeth - number of rotor teeth = even number.

number of stator teeth - number of rotor teeth = negative number.

number of stator teeth - number of rotor teeth = odd number.

number of stator teeth - number of rotor teeth = 0.

number of stator teeth - number of rotor teeth = even number.

number of stator teeth - number of rotor teeth = negative number.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

0.5 p.u

0.125 p.u

0.25 p.u

0.75 p.u

0.5 p.u

0.125 p.u

0.25 p.u

0.75 p.u

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

Inversely proportional to armature current.

Constant.

Proportional to armature current.

Proportional to the square of armature current.

Inversely proportional to armature current.

Constant.

Proportional to armature current.

Proportional to the square of armature current.

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Electrical Machines
In a transformer which of the following losses are zero?

All of these

Copper loss

Rotational loss

Iron loss

All of these

Copper loss

Rotational loss

Iron loss

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Electrical Machines
A DC generator can be considered as

prime mover.

rotating amplifier.

power pump.

rectifier.

prime mover.

rotating amplifier.

power pump.

rectifier.

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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 Cogging in induction motor occurs when

Electrical Machines A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

Electrical Machines For higher values of armature, the speed of a DC series motor is

Electrical Machines In a transformer which of the following losses are zero?

Electrical Machines A DC generator can be considered as

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
Cogging in induction motor occurs when

Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

Electrical Machines
For higher values of armature, the speed of a DC series motor is

Electrical Machines
In a transformer which of the following losses are zero?

Electrical Machines
A DC generator can be considered as