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

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

15.1 Ω

31.1 Ω

15.9 Ω

31.9 Ω

15.1 Ω

31.1 Ω

15.9 Ω

31.9 Ω

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Electrical Machines
For power factor improvement the synchronous motor is to be

heavily loaded and over excited

lightly loaded and underecited

heavily loaded and underexcited

lightly loaded and over excited

heavily loaded and over excited

lightly loaded and underecited

heavily loaded and underexcited

lightly loaded and over excited

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

1.8 9 Ω

2 .1 Ω

3.1 Ω

1.79 Ω

1.8 9 Ω

2 .1 Ω

3.1 Ω

1.79 Ω

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

machine A

machine B

none of these

any of the two machines

machine A

machine B

none of these

any of the two machines

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Electrical Machines
In a DC generator if field winding attains the critical resistance

the voltage generated will be zero.

machine will generate maximum power.

machine will generate maximum voltage.

field winding will burn.

the voltage generated will be zero.

machine will generate maximum power.

machine will generate maximum voltage.

field winding will burn.

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Electrical Machines
A DC compound motor has

only series field winding.

tertiary winding.

both shunt and series field winding.

only shunt field winding.

only series field winding.

tertiary winding.

both shunt and series field winding.

only shunt field winding.

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Electrical Machines

Electrical Machines For power factor improvement the synchronous motor is to be

Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

Electrical Machines In a DC generator if field winding attains the critical resistance

Electrical Machines A DC compound motor has

Electrical Machines
For power factor improvement the synchronous motor is to be

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

Electrical Machines
In a DC generator if field winding attains the critical resistance

Electrical Machines
A DC compound motor has