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Magnetic Circuit - Interview Questions and Answers

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1. 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
Explanation:
2. 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
Explanation:
3. Permeability in a magnetic circuit corresponds to______ in an electric circuit.
A. resistance
B. resistivity
C. conductivity
D. conductance
Explanation:
4. 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
Explanation:
5. A material for good magnetic memory should have
A. low hysteresis loss
B. high permeability
C. low retentivity
D. high retentivity
Explanation:
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