Magnetic Circuits Mcqs
Q.1: The relative permeability of a ferromagnetic material is_____________?F
A. less than one
B. more than one
C. more than 10
D. more than 100 or 1000
Q.2: Permeability in a magnetic circuit corresponds to________ in an electric circuitP
A. resistance
B. resistivity
C. conductivity
D. conductance
Q.3: Relative permeability of vacuum is__________?-
A. 1
B. 1 H/m
C. 1/4JI
D. 4n x 10- H/m
Q.4: Energy stored by a coil is doubled when its current is increased by percent___________?W
A. 25
B. 50
C. 41.4
D. 100
Q.5: 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
Q.6: Conductivity is analogous to____________?)
A. retentivity
B. resistivity
C. permeability
D. inductance
Q.7: Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivityu
A. low, high
B. high, high
C. high, low
D. low, low
Q.8: Hard steel is suitable for making permanent magnets because_____________?I
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
Q.9: Conductance is analogous to_____________?)
A. permeance
B. reluctance
C. flux
D. inductance
Q.10: The unit of retentivity is____________?'
A. weber
B. weber/sq. m
C. ampere turn/meter
D. ampere turn

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