| 1. | An open coil has ? | |
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zero resistance and inductance
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infinite resistance and zero inductance
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infinite resistance and normal inductance
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zero resistance and high inductance
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Report Question| 2. | 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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| 3. | Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is ? | |
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5 mH
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10 mH
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5 H
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10 H
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| 4. | Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla ? | |
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100 N
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400 N
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600 N
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1000 N
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| 5. | In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be ? | |
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2.0
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1.0
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0.5
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zero
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| 6. | A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area,length etc.) remaining the same, the inductance will be ? | |
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6 mH
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14mH
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24mH
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48mH
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| 7. | In case of an inductance, current is proportional to ? | |
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voltage across the inductance
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magnetic field
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both (a) and (b)
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neither (a) nor (b)
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| 8. | Air-core coils are practically free from ? | |
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hysteresis losses
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eddy current losses
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both (a) and (b)
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none of the above
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| 9. | The inductance of a coil will increase under all the following conditions except ? | |
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when more length for the same number of turns is provided
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when the number of turns of the coil increase
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when more area for each turn is provided
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when permeability of the core increases
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| 10. | For a purely inductive circuit which of the following is true ? | |
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Apparent power is zero
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Relative power is zero
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Actual power of the circuit is zero
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Any capacitance even if present in the circuit will not be charged
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