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

Read More Questions:
Magnetic Circuit MCQs Part1
Magnetic Circuit MCQs Part2
Magnetic Circuit MCQs Part3
Magnetic Circuit MCQs Part4
Magnetic Circuit MCQs Part5
Magnetic Circuit MCQs Part6