| 1. | If current in a conductor increases then according to Lenz's law self-induced voltage will ? | |
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aid the increasing current
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tend to decrease the amount of current
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produce current opposite to the increasing current
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aid the applied voltage
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Report Question| 2. | Higher the self-inductance of a coil ? | |
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lesser its weber-turns
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lower the e.m.f. induced
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greater the flux produced by it
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longer the delay in establishing steady current through it
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| 3. | For a 30 mH inductance (L1) and a 60 mH inductance (L2) The combined inductance of L1 and L2 in series aiding with 30 mH mutual inductance will be ? | |
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50 mH
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100 mH
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150 Mh
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200 mH
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| 4. | For a 30 mH inductance (L1) and a 60 mH inductance (L2) The value of coupling factor is ? | |
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0.00707
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0.0707
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0. 707
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7.07
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| 5. | Which circuit element(s) will oppose the change in circuit current ? | |
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Resistance only
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Inductance only
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Capacitance only
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Inductance and capacitance
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| 6. | An average voltage of 10 V is induced in a 260 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is ? | |
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20 Wb
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2 Wb
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0.2 Wb
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0.02 Wb
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| 7. | A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ? | |
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0.01 s
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0.1 s
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0.5 s
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6 s
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| 8. | Which of the following inductor will have the least eddy current losses ? | |
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Air core
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Laminated iron core
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Iron core
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Powdered iron core
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| 9. | A crack in the magnetic path of an inductor will result in ? | |
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unchanged inductance
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increased inductance
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zero inductance
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reduced inductance
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| 10. | For a 30 mH inductance (L1) and a 60 mH inductance (L2) The total inductance of L1 and L2 in series without mutual coupling will be ? | |
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15 mH
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45 mH
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90 mH
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120 mH
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