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
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
The direction of rotation of an hysteresis motor is determined by
A interchanging the supply leads
B position of shaded pole with respect to main pole
C retentivity of the rotor material
D none of these
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 one of the following statements best describes magnetic hysteresis?
A Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
B Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
C Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
D Hysteresis is most apparent when the core material is saturated
E None of the above
Which of the following statements regarding two value capacitor motor is incorrect ?
A It is a reversing motor
B It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
C It has low starting as well as rushing currents
D It has high starting torque
Which of the following statements regarding reluctance-start motor is incorrect ?
A It is similar to reluctance motor
B It is basically an induction motor and not a synchronous one
C So far as its basic working principle is concerned, it is similar to shaded pole motor
D the air-gap between rotor and salient poles is non- uniform
Which of the following statements regarding a reluctance motor is incorrect ?
A It cannot be reversed, ordinarily
B It requires no D.C. field excitation for its operation
C It is nothing else but a single-phase, salient pole synchronous-induction motor
D Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor

Next steps