The unit of reluctance is_____________?
A. metre/henry
B. henry/metre
C. henry
D. 1/henry
Month: December 2018
Reciprocal of reluctance is_______________?
Reciprocal of reluctance is_______________?
A. reluctivity
B. permeance
C. permeability
D. susceptibility
The property of a material which opposes the creation of magnetic flux in it is known as_____________?
The property of a material which opposes the creation of magnetic flux in it is known as_____________?
A. reluctivity
B. magnetomotive force
C. permeance
D. reluctance
Silicon steel is used in electrical machines because it has_____________?
Silicon steel is used in electrical machines because it has_____________?
A. low coercivity
B. low retentivity
C. low hysteresis loss
D. high coercivity
A ferrite core has less eddy current loss than an iron core because_______________?
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
Laminated cores, in electrical machines, are used to reduce____________?
Laminated cores, in electrical machines, are used to reduce____________?
A. copper loss
B. eddy current loss
C. hysteresis loss
D. all of the above
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
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
The unit of retentivity is____________?
The unit of retentivity is____________?
A. weber
B. weber/sq. m
C. ampere turn/meter
D. ampere turn
Conductance is analogous to_____________?
Conductance is analogous to_____________?
A. permeance
B. reluctance
C. flux
D. inductance
Hard steel is suitable for making permanent magnets because_____________?
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