Related Questions

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
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
No eddy current and hysteresis losses occur in
A Electrostatic instruments
B PMMC instruments
C Moving iron instruments
D Electrodynamo meter instruments
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 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
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
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
Heating wet steam at constant temperature is heating it at constant
A Volume
B Pressure
C Entropy
D Enthalpy
In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating
A Decreases with increase in Rankine cycle efficiency
B Increases with increase in Rankine cycle efficiency
C Is unaffected by increase in Rankine cycle efficiency
D None of the above
In resistance heating highest working temperature is obtained from heating elements made of
A Nickel copper
B Nichrome
C Silicon carbide
D Silver

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