Standard IF in FM receivers

Q.  The standard value for Intermediate frequency (IF) in double conversion FM receivers is
- Published on 14 Oct 15

a. 455 KHz
b. 580 KHz
c. 10.7 MHz
d. 50 MHz

ANSWER: 10.7 MHz
 
Intermediate frequency (IF) is a frequency at which the received carrier frequency is shifted for detection of message signal. The IF is generated by mixing the received carrier with the locally generated signal. The IF is generated and is shifted to further amplifiers and detectors for amplification and detection of message signal respectively. In double-conversion super heterodyne receivers, an intermediate frequency of 10.7 MHz is used, and then a second intermediate frequency of 470 kHz is used.

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