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
Answer: Option A
Related Questions on Magnetic Circuit
A. E.M.F.
B. Current
C. Current density
D. Conductivity
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
Laminated cores, in electrical machines, are used to reduce
A. Copper loss
B. Eddy current loss
C. Hysteresis loss
D. All of the above
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