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Q1:

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.

A P is doubled, Q is halved

B P is halved, Q is doubled

C P remains constant, Q is doubled

D P decreases 4 times, Q is doubled

ANS:D - P decreases 4 times, Q is doubled

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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