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
Related Mcqs:
- 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 - Permanent magnets are normally made of_____________?
A. alnico alloys
B. aluminium
C. cast iron
D. wrought iron - 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 - Silicon steel is used in electrical machines because it has_____________?
A. low coercivity
B. low retentivity
C. low hysteresis loss
D. high coercivity - Permeability in a magnetic circuit corresponds to________ in an electric circuit
A. resistance
B. resistivity
C. conductivity
D. conductance - Relative permeability of vacuum is__________?
A. 1
B. 1 H/m
C. 1/4JI
D. 4n x 10-‘ H/m - 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 - Reciprocal of reluctance is_______________?
A. reluctivity
B. permeance
C. permeability
D. susceptibility - 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 - The unit of magnetic flux is______________?
A. henry
B. weber
C. ampereturn/weber
D. ampere/metre
