Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is

Electrical Machines
Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is

1, 2, 6

1, 3, 5

1, 2, 5

1, 4, 6

1, 2, 6

1, 3, 5

1, 2, 5

1, 4, 6

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

8.

4.

2.

1.

8.

4.

2.

1.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

such that actual impedance of all transformers would be same.

inversely proportional to MVA rating of transformers.

same.

proportionate to MVA rating of transformers.

such that actual impedance of all transformers would be same.

inversely proportional to MVA rating of transformers.

same.

proportionate to MVA rating of transformers.

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

The speed in both the direction is required.

Very fine speed control over the whole range from zero to normal speed is required.

All of above.

The accuracy in speed control is required.

The speed in both the direction is required.

Very fine speed control over the whole range from zero to normal speed is required.

All of above.

The accuracy in speed control is required.

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Electrical Machines
High starting torque and low starting current is the advantage of

hysteresis motor.

slip ring induction motor.

squirrel cage induction motor.

stepper motor.

hysteresis motor.

slip ring induction motor.

squirrel cage induction motor.

stepper motor.

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Electrical Machines
Universal motors are used in

traction

cranes

food processing

All of these

traction

cranes

food processing

All of these

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Electrical Machines

Electrical Machines If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

Electrical Machines When operating, two or more transformers in parallel, % impedance of these transformers should be

Electrical Machines Ward-Leonard system for controlling the speed of a DC motor is used where

Electrical Machines High starting torque and low starting current is the advantage of

Electrical Machines Universal motors are used in

Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

Electrical Machines
High starting torque and low starting current is the advantage of

Electrical Machines
Universal motors are used in