A. copper loss
B. eddy current loss
C. hysteresis loss
D. all of the above
Related Mcqs:
- Silicon steel is used in electrical machines because it has_____________?
A. low coercivity
B. low retentivity
C. low hysteresis loss
D. high coercivity - Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss
A. high, high
B. low, high
C. high, low
D. low, low - Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?
A. lowers their power efficiency
B. increases their cost of manufacture
C. leads to their increased weight
D. produces fringing - While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
A. E.m.f.
B. Current
C. Current density
D. Conductivity - Conductivity is analogous to____________?
A. retentivity
B. resistivity
C. permeability
D. inductance - Hard steel is suitable for making permanent magnets because_____________?
A. it has good residual magnetism
B. its hysteresis loop has large area
C. its mechanical strength is high
D. its mechanical strength is low - 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 least depends on____________?
A. volume of material
B. frequency
C. steinmetz coefficient of material
D. ambient temperature - The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is__________Vs
A. 50
B. 20
C. 0.05
D. 500 - 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
