A. less than one
B. more than one
C. more than 10
D. more than 100 or 1000
Related Mcqs:
- Relative permeability of vacuum is__________?
A. 1
B. 1 H/m
C. 1/4JI
D. 4n x 10-‘ H/m - Permeability in a magnetic circuit corresponds to________ in an electric circuit
A. resistance
B. resistivity
C. conductivity
D. conductance - 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 - 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 - The unit of reluctance is_____________?
A. metre/henry
B. henry/metre
C. henry
D. 1/henry - 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 - 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 material for good magnetic memory should have____________?
A. low hysteresis loss
B. high permeability
C. low retentivity
D. high retentivity - The unit of retentivity is____________?
A. weber
B. weber/sq. m
C. ampere turn/meter
D. ampere turn - 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
