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

Correct Answer: Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

Bissoy MCQ
#Computer Science #Electronic Principles

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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
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B Flux density lagging behind magnetizing force
C Molecular friction
D It high retentivity
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A fans
B blowers
C sound equipment
D mixer grinders
Which of the following statements regarding hysteresis motor is in incorrect ?
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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 steps is likely to result in reduction of hysteresis loss in a D.C. generator?
A Providing laminations in armature core
B Providing laminations in stator
C Using nonmagnetic material for frame
D Using material of low hysteresis coefficient for armature core material
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A hysteresis loss
B magnetisation of rotor
C eddy current loss
D electromagnetic induction
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A retentivity
B resistivity
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B PMMC instruments
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A DC
B AC
C Both AC and DC
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C Volume and grade of iron
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