Discussion :: Exam Questions Paper
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A coil has a designed for high Q performance at a rated voltage and a specified frequency. If the frequency of operation is doubled, and the coil is operated at the same rated voltage, then the Q factor and the active power P consumed by the coil will be affected as follows.
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A.
P is doubled, Q is halved
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B.
P is halved, Q is doubled
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C.
P remains constant, Q is doubled
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D.
P decreases 4 times, Q is doubled
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Answer : Option D
Explanation :
ω2L = 2ω1L, R remains constant
∴ Q2 = 
= 2Q1 i.e. Q is doubled
for a high a coil ωL >> R
∴ 
i.e. P decreases 4 times.
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