| 1. | Which of the following statement is TRUE about the magnetic reluctivity ? | |
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Reluctivity is the reciprocal of reluctance.
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Reluctivity is the reciprocal of susceptibility.
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Reluctivity is the reciprocal of permeance.
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Reluctivity is the reciprocal of permeability.
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Report Question| 2. | The ratio of total flux linkage to used flux is known as ? | |
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flux gain factor
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flux leakage factor
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field gain factor
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field leakage factor
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| 3. | Magnetic flux per unit area is called ? | |
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permeability
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susceptibility
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magnetic flux density
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reluctivity
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| 4. | What will be the permeance (in H) of a coil, when the flux through the coil is 50 Wb and the value of produced mml is 25 Amp-turns ? | |
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6
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4
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3
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2
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| 5. | What will be the current (in A) through a solenoid, when the solenoid has 160 turns and produces an mmf of 32 Amp-turns ? | |
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0.1
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0.2
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0.4
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0.8
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| 6. | Determine the magnetic field strength (in A-turns/m) when the intensity of magnetization of the material is 0.078 A-turns/metre and the magnetic susceptibility of the material is 0.0013. ? | |
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60
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40
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50
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20
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| 7. | What will be the value of coupling factor between two coils, when the self-inductance of each coil is 30 mH and the mutual inductance between them is 60 mH ? | |
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6
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3
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2
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1
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| 8. | Determine the eddy current loss (in W) in a material having eddy current coefficient of 1, thickness of 0.04 m and volume of 2 cubic metre which is kept in a magnetic field having a maximum flux density of 4 T and supplied by a frequency of 50 Hz ? | |
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140
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128
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108
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100
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| 9. | What will be value of magnetic field (in mT} at the centre of a 7 m long coil, when the coil has 230 turns and carrying a current of 3 A ? | |
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0.426
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0.435
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0.265
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0.124
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| 10. | Which of the following is the expression for quality factor of parallel RLC circuit ? | |
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(1/R) root L/C
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(1/L) root R/C
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(R) root C/L
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(C) root R/L
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