| 1. | In an A.C. circuit (sine wave) with R and L in series ? | |
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voltage across R and L are 180º out of phase
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the voltage across R lags the voltage across L by 90º
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the voltage across R leads the voltage across L by 90º
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voltage across R and L are in phase
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Report Question| 2. | Which of the following expression is true for apparent power in an A.C. circuit ? | |
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VI cos ?
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VaV. X Iav.
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Vr.m.s. X Ir.m.s
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Vpeak X Ipeak
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| 3. | The equation of 50 Hz current sine wave having r.m.s. value of 60 A is ? | |
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60 sin 25 t
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60 sin 50 t
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84.84 sin 314 t
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42.42 sin 314 t
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| 4. | The power taken by a 3-? load is given by the expression ? | |
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?3 VLIL sin ?
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?3 VLIL cos ?
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3 VLIL sin ?
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3 VLIL cos ?
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| 5. | At a frequency less than the resonant frequency ? | |
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series circuit is inductive and parallel circuit is capacitive
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series circuit is capacitive and parallel circuit is inductive
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both circuits are capacitive
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both circuits are inductive
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| 6. | The dual of a link is ? | |
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twig
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node
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loop
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tree branch
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| 7. | Which of the following statement is incorrect ? | |
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Resistance is a passive element
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Voltage source is an active element
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Conductance is a passive element
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Current source is a passive element
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| 8. | The power factor of a series R-L-C circuit at its half-power points is ? | |
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unity
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lagging
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leading
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lagging or leading
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| 9. | ln a series resonant circuit the voltage across the circuit is the same as the voltage across ? | |
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inductance
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capacitance
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resistance
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none of the above
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| 10. | ln A.C. circuit the power curve is a sine wave having ? | |
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double the frequency of voltage
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same frequency as that of voltage
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half the frequency of the voltage
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three times the frequency of the voltage
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