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Electrical Engineering
Magnetic Circuit
Quiz 4
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Q.1
Relative permeability of vacuum is
1
1 H/m
1/4JI
4n × 10' H/m
Q.2
The initial rate of rise of current through a coil of inductanceH when suddenly connected to a D.C. supply ofV is ___________Vs
50
20
0.05
500
Q.3
Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss.
High, high
Low, high
High, low
Low, low
Q.4
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?
E.M.F.
Current
Current density
Conductivity
Q.5
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.
Low, high
High, high
High, low
Low, low
Q.6
Laminated cores, in electrical machines, are used to reduce
Copper loss
Eddy current loss
Hysteresis loss
All of the above
Q.7
The unit of magnetic flux is
Henry
Weber
Ampere-turn/weber
Ampere/metre
Q.8
Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it
Lowers their power efficiency
Increases their cost of manufacture
Leads to their increased weight
Produces fringing
0 h : 0 m : 1 s
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