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