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Electrical Engineering - Magnetic Circuit MCQs
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Electrical Engineering - Magnetic Circuit MCQs
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25 Questions

1. A material for good magnetic memory should have
2. Silicon steel is used in electrical machines because it has
3. Conductance is analogous to
4. Point out the wrong statement.Magnetic leakage is undesirable in electric machines because it
5. Relative permeability of vacuum is
6. Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity.
7. 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
8. The unit of reluctance is
9. The unit of magnetic flux is
10. Permeability in a magnetic circuit corresponds to______ in an electric circuit.
11. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
12. In a magnetic material hysteresis loss takes place primarily due to
13. Laminated cores, in electrical machines, are used to reduce
14. Permanent magnets are normally made of
15. Energy stored by a coil is doubled when its current is increased by percent.
16. Hard steel is suitable for making permanent magnets because
17. An air gap is usually inserted in magnetic circuits to
18. Hysteresis loss least depends on
19. Reciprocal of reluctance is
20. Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.
21. If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
22. The relative permeability of a ferromagnetic material is
23. The unit of retentivity is
24. When both the inductance and resistance of a coil are doubled the value of
25. Conductivity is analogous to

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