The resonant frequency of quartz crystal oscillator is 450 kHz. The equivalent inductance and series resistance at resonant frequency are 4.2 H and 9050 ohms respectively. The quality factor of the crystal will approximately be

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BSPHCL JE Electrical 2019 Official Paper: Batch 2 (Held on 31 Jan 2019)
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  1. 74.3
  2. 1312.7
  3. 1449.5
  4. 1093.00

Answer (Detailed Solution Below)

Option 2 : 1312.7
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Detailed Solution

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Concept

The quality factor of the crystal is:

The resonant frequency is given by:

Calculation

Given, f = 450 kHZ

L = 4.2 H

Squaring on both sides,

QF = 1312.7

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