Related Questions

Hysteresis loss and eddy current loss are used in
A Induction heating of steel
B Dielectric heating
C Induction heating of brass
D Resistance heating
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
Which of the fpllowing inductor will have the least eddy current losses ?
A Air core
B Laminated iron core
C Iron core
D Powdered iron core
Which of the following inductor will have the least eddy current losses?
A Air core
B Laminated iron core
C Iron core
D Powdered iron core
A laminated iron core has reduced eddy-current losses because
A More wire can be used with less D.C. resistance in coil
B The laminations are insulated from each other
C The magnetic flux is concentrated in the air gap of the core
D The laminations are stacked vertically
Losses which occur in rotating electric machines and do not occur in trans formers are
A friction and windage losses
B magnetic losses
C hysteresis and eddy current losses
D copper losses
The disc of an instrument using eddy current damping should be of
A conducting and magnetic material
B non-conducting and magnetic material
C conducting and non-magnetic material
D none of the above
A ferrite core has less eddy current loss than an iron core because
A Ferrites have high resistance
B Ferrites are magnetic
C Ferrites have low permeability
D Ferrites have high hysteresis
Which of the following is an advantage of eddy current heating?
A The amount of heat generated can be controlled accurately
B Heat at very high rate can be generated
C The area of the surface over which heat is produced can be accurately controlled
D All of the above
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

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