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
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

1.79 Ω

2 .1 Ω

3.1 Ω

1.8 9 Ω

1.79 Ω

2 .1 Ω

3.1 Ω

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

All of these

minimum

zero

maximum

All of these

minimum

zero

maximum

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

none of above.

Ward Leonard control.

rheostatic control.

any of above method.

none of above.

Ward Leonard control.

rheostatic control.

any of above method.

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

high and high

low and low

low and high

high and low

high and high

low and low

low and high

high and low

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

1500 Volt.

2000 Volt.

1600 Volt.

0 Volt.

1500 Volt.

2000 Volt.

1600 Volt.

0 Volt.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

Torque decrease and speed increases.

Both torque and speed decrease.

Torque and speed both increase.

Torque increase and speed decrease.

Torque decrease and speed increases.

Both torque and speed decrease.

Torque and speed both increase.

Torque increase and speed decrease.

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Electrical Machines

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 If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

Electrical Machines To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

Electrical Machines For a dc machine shunt resistance and armature resistance values are

Electrical Machines The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

Electrical Machines When a DC cummulative compound wound motor is loaded

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
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

Electrical Machines
When a DC cummulative compound wound motor is loaded