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CBSE Class 12-science Answered

define quality factor in an A.C. circuit.why should the quality factor have high value in recieving circuits? name the factors on which it depends?
Asked by jaspreet singh | 27 Feb, 2011, 02:46: AM
answered-by-expert Expert Answer
Dear studnent,
 
 quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is.Higher Q indicates a lower rate of energy loss relative to the stored energy of the oscillator; the oscillations die out more slowly.A pendulum suspended from a high-quality bearing, oscillating in air, has a high Q, while a pendulum immersed in oil has a low one. 
 
For the receiving circuits, the sensitivity must be high. So, the Q factor must be high.
 
The Q factor (quality factor) of a resonator is a measure of the strength of the damping of its oscillations, or for the relative linewidth.
 
 
The Q factor of a resonator depends on the optical frequency ν0, the fractional power loss lper round trip, and the round-trip time Trt:
 
Hope this helps.
Team
Topperlearning.com
Answered by | 27 Feb, 2011, 06:50: AM

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