AC Circuit objective questions (mcq) and answers
16. A current is set to be alternating when it changes in
A. Magnitude only
B. Direction only
C. Both magnitude and direction
D. None of the above
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C. Both magnitude and direction
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17. The most important advantage of using electrical energy in the form of a a.c. is
A. The construction cost per kilowatt of a.c. generator is lower than that of d.c. generator
B. Conductor of smaller x-section is required in case of a.c. in comparison to d.c. for carrying the same current
C. Less insulation is required in case of a.c.
D. Transformation of voltage is possible in case of a.c. only
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18. A boiler at home is switched on to the a.c. mains supply in power at 230 V, 50 Hz. The frequency of instantaneous power consumed is
A. 0 Hz
B. 50 Hz
C. 100 Hz
D. 150 Hz
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19. The power factor of an ordinary electric bulb is
A. Zero
B. Unity
C. Slightly more than unity
D. Slightly less than unity
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20. The power factor of practical inductor is
A. Unity
B. Zero
C. Lagging
D. Leading
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