| 1. | If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is ? | |
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a sinusoid of the same frequency
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a sinusoid of half the original frequency
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a sinusoid of double the frequency
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not a sinusoid
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Report Question| 2. | The r.m,s. value of a half-wave rectified current is 100 A Its value for full-wave rectification would be ...... ampere ? | |
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141.4
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200
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200/ ?
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40/ ?
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| 3. | 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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| 4. | In a sine wave the slope is constant ? | |
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between 0º and 90º
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between 90º and 180º
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between 180º and 270º
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no where
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| 5. | Inductance of a coil varies ? | |
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directly as the cross-sectional area of magnetic core
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directly as square of number of turns
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inversely as the length of the iron path
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as (a) to (c)
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| 6. | How much r.m.s. current does a 300 W. 200 V bulb take from the 200 V, 50 Hz power line ? | |
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0.5 A
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1.5 A
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2 A
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3 A
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| 7. | In the R-L-C containing R = 4.5 Q, L = 0.06 H, C = 0.6 ?F the power factor will be ? | |
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zero
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lagging
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leading
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unity
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| 8. | On a 3-? balanced delta-connected load supplied at 240 V A.C., the wattmeter readings are -1710 and 3210. What is the current ? | |
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10.86 A
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20.86A
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15.86 A
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30.86 A
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