A. 25
B. 50
C. 41.4
D. 100
Related Mcqs:
- When both the inductance and resistance of a coil are doubled the value of________________?
A. time constant remains unchanged
B. initial rate of rise of current is doubled
C. final steady current is doubled
D. time constant is halved - The rate of rise of current through an inductive coil is maximum_____________?
A. at 63.2% of its maximum steady value
B. at the start of the current flow
C. after one time constant
D. near the final maximum value of current - 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 - 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 - 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 - Conductance is analogous to_____________?
A. permeance
B. reluctance
C. flux
D. inductance - The unit of retentivity is____________?
A. weber
B. weber/sq. m
C. ampere turn/meter
D. ampere turn - 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 - Hysteresis loss least depends on____________?
A. volume of material
B. frequency
C. steinmetz coefficient of material
D. ambient temperature - A material for good magnetic memory should have____________?
A. low hysteresis loss
B. high permeability
C. low retentivity
D. high retentivity
