Magnetic Circuit Objective Questions and Answers
1. An air gap is usually inserted in a magnetic circuits to
A. Increase m.m.f.
B. Increase the flux
C. Prevent saturation
D. None of the above
✔ View Answer
C. Prevent saturation
✍ Your Comments
2. Permeability in a magnetic circuit corresponds to ................in an electric circuit
A. Resistance
B. Resistivity
C. Conductivity
D. Conductance
✔ View Answer
✍ Your Comments
3. Those magnetic materials are best suited for making armature and transform cores which have ...........permeability and ...........hysteresis loss
A.High, high
B. Low, high
C. High, low
D. Low, low
✔ View Answer
✍ Your Comments
4. In a magnetic material hysteresis loss takes place primarily due to
A. Rapid reversals of its magnetisation
B. Flux density lagging behind the magnetising force
C. Molecular friction
D. It high retentivity
✔ View Answer
✍ Your Comments
5. The property of a material which opposes the creation of magnetic flux in it is known as
A. Reluctivity
B. Magnetomotive force
C. Permeance
D. Reluctance
✔ View Answer
✍ Your Comments