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Magnetic Circuit

Magnetic Circuit
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.

Conductivity
Resistance
Conductance
Resistivity

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Magnetic Circuit
Relative permeability of vacuum is

3
1
6
5

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Magnetic Circuit
Laminated cores, in electrical machines, are used to reduce

Copper loss
All of the listed here
Eddy current loss
Hysteresis loss

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Magnetic Circuit
Silicon steel is used in electrical machines because it has

High coercivity
Low retentivity
Low coercivity
Low hysteresis loss

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Magnetic Circuit
When both the inductance and resistance of a coil are doubled the value of

Time constant is halved
Final steady current is doubled
Time constant remains unchanged
Initial rate of rise of current is doubled

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Magnetic Circuit
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

50
500
20
70

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