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Speed control of a universal motor is achieved by__________?

Speed control of a universal motor is achieved by__________?

A. varying field flux with tapped field windings
B. connecting rheostat in series
C. applying variable voltage by means of silicon controlled rectifier
D. applying variable voltage by means of variable auto-transformer
E. all of the above methods

Speed control of a universal motor is achieved by__________? Read More »

Single Phase Induction Motors

Which of the following statements regarding hysteresis motor is in incorrect?

Which of the following statements regarding hysteresis motor is in incorrect?

A. It is extremely sensitive to fluctuations in supply voltage
B. Its high starting torque is due to its high rotor hysteresis loss
C. It is extremely quiet in operation
D. It accelerates from rest to full-speed almost instantaneously

Which of the following statements regarding hysteresis motor is in incorrect? Read More »

Single Phase Induction Motors

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?

A. fans
B. blowers
C. sound equipment
D. mixer grinders

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________? Read More »

Single Phase Induction Motors

The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?

The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?

A. armature winding
B. field winding
C. either armature winding or field winding
D. none of the above

The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________? Read More »

Single Phase Induction Motors

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?

A. high inductance of field and armature circuits
B. induced current in rotor due to variations of flux
C. fine copper wire winding
D. none of the above

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________? Read More »

Single Phase Induction Motors