A. volume of material
B. frequency
C. steinmetz coefficient of material
D. ambient temperature
Related Mcqs:
- 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 - In a magnetic material hysteresis loss takes place primarily due to___________?
A. rapid reversals of its magnetisation
B. flux density lagging behind magnetising force
C. molecular friction
D. it high retentivity - 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 - 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 - The relative permeability of a ferromagnetic material is_____________?
A. less than one
B. more than one
C. more than 10
D. more than 100 or 1000 - 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 - Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity
A. low, high
B. high, high
C. high, low
D. low, low - An air gap is usually inserted in magnetic circuits to____________?
A. increase m.m.f.
B. increase the flux
C. prevent saturation
D. none of the above - 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
