Magnetic Circuit - electrical multiple choice questions and answers pdf

1. An air gap is usually inserted in magnetic circuits to
(a)     increase m.m.f.
(b)     increase the flux
(c) prevent saturation
(d) none of the above

Ans: c

2. 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

Ans: d

3. The unit of magnetic flux is
(a)     henry
(b)     weber
(c) ampereturn/weber
(d) ampere/metre
Ans: b

4. Permeability in a magnetic circuit corresponds to______ in an electric circuit.
(a) resistance
(b) resistivity
(c) conductivity    
(d) conductance
Ans: c

5. 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
Ans: a

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