Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 3 (Q.No. 27)
27.
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.
Answer: Option
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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