Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

2, 3 and 4.

2 and 4.

1, 2 and 3.

1, 3 and 4.

2, 3 and 4.

2 and 4.

1, 2 and 3.

1, 3 and 4.

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Electrical Machines
In which of the following motors DC excitation is not required?

reluctance motor

3-phase synchronous generator

hysteresis motor

3-phase synchronous motor

reluctance motor

3-phase synchronous generator

hysteresis motor

3-phase synchronous motor

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Electrical Machines
Iron loss in a transformer mainly occurs in

transformer insulating oil.

winding of transformer.

steel core in transformer.

iron made tank of transformer.

transformer insulating oil.

winding of transformer.

steel core in transformer.

iron made tank of transformer.

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

67.5%

78.5%

82.5%

72.5%

67.5%

78.5%

82.5%

72.5%

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Electrical Machines
The application that need frequent starting and stopping is

paper mills.

jaw crushers.

blowers.

lifts and hoists.

paper mills.

jaw crushers.

blowers.

lifts and hoists.

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Electrical Machines
In a synchronous motor electromagnetic power varies

directly as applied voltage

directly as square of applied voltage

None of these

inversely as applied voltage

directly as applied voltage

directly as square of applied voltage

None of these

inversely as applied voltage

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Electrical Machines

Electrical Machines Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines In which of the following motors DC excitation is not required?

Electrical Machines Iron loss in a transformer mainly occurs in

Electrical Machines A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines The application that need frequent starting and stopping is

Electrical Machines In a synchronous motor electromagnetic power varies

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
In which of the following motors DC excitation is not required?

Electrical Machines
Iron loss in a transformer mainly occurs in

Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines
The application that need frequent starting and stopping is

Electrical Machines
In a synchronous motor electromagnetic power varies