1. Tesla is a unit of _______.
2. A permeable substance is one
3. The materials having low retentivity are suitable for making
4. A magnetic field exists around
5. Ferrites are ______ materials.
6. Air gap has_______eluctance as compared to iron or steel path
7. The direction of magnetic lines of force is
8. Which of the following is a vector quantity ?
9. The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is
10. A material which is slightly repelled by a magnetic field is known as
11. When an iron piece is placed in a magnetic field
12. Fleming's left hand rule is used to find
13. The ratio of intensity of magnetisation to the magnetization force is known as
14. Magnetising steel is normals difficult because
15. The left hand rule correlates to
16. The unit of relative permeability is
17. A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
18. The force between two long parallel conductors is inversely proportional to
19. Materials subjected to rapid reversal of magnetism should have
20. Indicate which of the following material does not retain magnetism permanently.
21. The main constituent of permalloy is
22. The use of permanent magnets is. not made in
23. Paramagnetic materials have relative permeability
24. Degaussing is the process of
25. Substances which have permeability less than the permeability of free space are known as
26. Two infinitely long parallel conductors in vacuum and separated 1 meter between centers when a current of 1 ampere flows through each conductor, produce on each other a force of
27. In the left hand rule, forefinger always represents
28. Which of the following is a ferromagnetic material ?
29. Ferrites are a sub-group of
30. Gilbert is a unit of
31. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
32. Reciprocal of permeability is
33. The relative permeability is less than unity is case of
34. Which of the following is the unit of magnetic flux density ?
35. The magnetism left in the iron after exciting field has been removed is known as
36. Which of the following is not a unit of flux?
37. Which of the following is expected to have the maximum permeability ?
38. One telsa is equal to ______.
39. Out of the following statements, concerning an electric field, which statement is not true ?
40. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon
41. One maxwell is equal to ______.
42. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle
43. Susceptibility is positive for
44. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per metre of length of each conductor will be
45. A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be
46. A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be
47. The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?
48. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current line carrying 10 amperes and spaced 100 mm apart ?
49. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
50. The unit of flux is the same as that of
51. Unit for quantity of electricity is
52. The Biot-savart's law is a general modification of
53. The most effective and quickest may of making a magnet from soft iron is by
54. The commonly used material for shielding or screening magnetism is
55. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
56. A permanent magnet
57. The retentivity (a property) of material is useful for the construction of
58. The relative permeability of materials is not constant.
59. The materials are a bit inferior conductors of magnetic flux than air.
60. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.
61. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
62. A keeper is used to
63. Magnetic moment is a
64. The change of cross-sectional area of conductor in magnetic field will affect
65. The uniform magnetic field is
66. The magneto-motive force is
67. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?
68. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
69. Which of the following statements is correct ?
70. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
71. The magnetic reluctance of a material
72. The initial permeability of an iron rod is
73. How does the magnetic compass needle behave in a magnetic field ?
74. In a simple magnetic field the strength of magnet flux
75. The stray line of magnetic flux is defined as
76. The bar magnet has
77. Which of the following materials are dia-magnetic ?
78. Which of the following type of materials are not very important for engineering applications ?
79. The susceptibility of paramagnetic materials generally lies between
80. For which of the following materials the saturation value is the highest ?
81. The magnetic materials exhibit the property of magnetisation because of
82. For which of the following materials the net magnetic moment should be zero ?
83. The attraction capacity of electromagnet will increase if the
84. Which of the following statements is correct ?
85. Temporary magnets are used in
86. Main causes of noisy solenoid are
87. Strength of an electromagnet can be increased by
88. Core of an electromagnet should have
89. Magnetism of a magnet can be destroyed by
2. A permeable substance is one
3. The materials having low retentivity are suitable for making
4. A magnetic field exists around
5. Ferrites are ______ materials.
6. Air gap has_______eluctance as compared to iron or steel path
7. The direction of magnetic lines of force is
8. Which of the following is a vector quantity ?
9. The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is
10. A material which is slightly repelled by a magnetic field is known as
11. When an iron piece is placed in a magnetic field
12. Fleming's left hand rule is used to find
13. The ratio of intensity of magnetisation to the magnetization force is known as
14. Magnetising steel is normals difficult because
15. The left hand rule correlates to
16. The unit of relative permeability is
17. A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
18. The force between two long parallel conductors is inversely proportional to
19. Materials subjected to rapid reversal of magnetism should have
20. Indicate which of the following material does not retain magnetism permanently.
21. The main constituent of permalloy is
22. The use of permanent magnets is. not made in
23. Paramagnetic materials have relative permeability
24. Degaussing is the process of
25. Substances which have permeability less than the permeability of free space are known as
26. Two infinitely long parallel conductors in vacuum and separated 1 meter between centers when a current of 1 ampere flows through each conductor, produce on each other a force of
27. In the left hand rule, forefinger always represents
28. Which of the following is a ferromagnetic material ?
29. Ferrites are a sub-group of
30. Gilbert is a unit of
31. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
32. Reciprocal of permeability is
33. The relative permeability is less than unity is case of
34. Which of the following is the unit of magnetic flux density ?
35. The magnetism left in the iron after exciting field has been removed is known as
36. Which of the following is not a unit of flux?
37. Which of the following is expected to have the maximum permeability ?
38. One telsa is equal to ______.
39. Out of the following statements, concerning an electric field, which statement is not true ?
40. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon
41. One maxwell is equal to ______.
42. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle
43. Susceptibility is positive for
44. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per metre of length of each conductor will be
45. A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be
46. A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be
47. The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?
48. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current line carrying 10 amperes and spaced 100 mm apart ?
49. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
50. The unit of flux is the same as that of
51. Unit for quantity of electricity is
52. The Biot-savart's law is a general modification of
53. The most effective and quickest may of making a magnet from soft iron is by
54. The commonly used material for shielding or screening magnetism is
55. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
56. A permanent magnet
57. The retentivity (a property) of material is useful for the construction of
58. The relative permeability of materials is not constant.
59. The materials are a bit inferior conductors of magnetic flux than air.
60. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.
61. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
62. A keeper is used to
63. Magnetic moment is a
64. The change of cross-sectional area of conductor in magnetic field will affect
65. The uniform magnetic field is
66. The magneto-motive force is
67. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?
68. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
69. Which of the following statements is correct ?
70. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
71. The magnetic reluctance of a material
72. The initial permeability of an iron rod is
73. How does the magnetic compass needle behave in a magnetic field ?
74. In a simple magnetic field the strength of magnet flux
75. The stray line of magnetic flux is defined as
76. The bar magnet has
77. Which of the following materials are dia-magnetic ?
78. Which of the following type of materials are not very important for engineering applications ?
79. The susceptibility of paramagnetic materials generally lies between
80. For which of the following materials the saturation value is the highest ?
81. The magnetic materials exhibit the property of magnetisation because of
82. For which of the following materials the net magnetic moment should be zero ?
83. The attraction capacity of electromagnet will increase if the
84. Which of the following statements is correct ?
85. Temporary magnets are used in
86. Main causes of noisy solenoid are
87. Strength of an electromagnet can be increased by
88. Core of an electromagnet should have
89. Magnetism of a magnet can be destroyed by
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