Related Questions

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
A Zero
B Small
C Large
D None of the above
In repulsion motor direction of rotation of motor
A Is opposite to that of brush shift
B Is the same as that of brush shift
C Is independent of brush shift
D None
In case of a shaded pole motor the direction of rotation of the motor is
A from main pole to shaded pole
B from shaded pole to main pole
C either of the above depending on voltage
D either of the above depending on power factor
A hysteresis motor works on the principle of
A hysteresis loss
B magnetisation of rotor
C eddy current loss
D electromagnetic induction
In a hysteresis motor, the rotor must have
A retentivity
B resistivity
C susceptibility
D none of the above
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
Hysteresis motor is particularly useful for high-quality record players and tape-recorders because
A it revolves synchronously
B it is not subject to any magnetic or mechanical vibrations
C it can be easily manufactured in extremely small sizes of up to 1 W output
D it develops hysteresis torque which is extremely steady both in amplitude and phase
The rotor of a hysteresis motor is made of
A aluminium
B cast iron
C chrome steel
D copper
Which of the following law/rule can he used to determine the direction of rotation of D.C. motor?
A Lenz
B Faraday
C Coulomb’s law
D Fleming
The direction of rotation of a D.C. series motor can be changed by
A Interchanging supply terminals
B Interchanging field terminals
C Either of (A) and (B) above
D None of the above

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