| 1. | The transient currents are associated with the ? | |
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changes in the stored energy in the inductors and capacitors
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impedance of the circuit
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applied voltage to the circuit
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resistance of the circuit
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Report Question| 2. | Physical quantities of resistance, inductance and capacitance are represented by R, L and C respectively. The combinations which have dimensions of frequency are ? | |
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C/L
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R/L
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1/RC
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1/?LC
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| 3. | If sinusoidal wave has frequency of 50 Hz with 30A r.m.s. current which of the following equation represents this wave ? | |
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42.42 sin 314 t
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60 sin 25 t
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30 sin 50 t
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84.84 sin 25 t
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| 4. | The safest value of current the human body can carry for more than 3 second is ? | |
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4 mA
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9 mA
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15 ma
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25 mA
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| 5. | Which of the following statements pertains to resistors only ? | |
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can dissipate considerable amount of power
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can act as energy storage devices
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connecting them in parallel increases the total value
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oppose sudden changes in voltage
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| 6. | 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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| 7. | The dual of a loop is ? | |
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twig
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node pair
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mesh
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tree
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| 8. | If two sine waves of the same frequency have a phase difference of n radians, then ? | |
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both will reach their minimum values at the same instant
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both will reach their maximum values at the same instant
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when one wave reaches its maximum value, the other will reach its minimum value
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none of the above
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| 9. | The dynamic impedance of an R-L and C parallel circuit at resonance is ...... ohm ? | |
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R/LC
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C/LR
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LC/R
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L/CR
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| 10. | The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ?. If frequency is increased to 100 Hz, reactance becomes ...... ohms ? | |
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2.5
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5
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10
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15
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