Electronics and Communication Engineering - Radio Receivers

Exercise :: Radio Receivers - Section 1

11. 

Which are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz

A. 30, 60 and 70 kHz
B. 3, 6 and 7 kHz
C. 30, 60 and 70 MHz
D. 3, 6 and 7 GHz

Answer: Option C

Explanation:

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12. 

In a ratio detector

A. the linearity is worse than in a phase discriminator
B. the output is twice that obtainable from a similar phase discriminator
C. stabilization against signal strength variations is provided
D. the circuit is the same as in a discriminator, except that the diodes are reversed

Answer: Option A

Explanation:

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13. 

Neutralization is used in RF amplifiers to

A. stop oscillation
B. increase bandwidth
C. improve selectivity
D. all of the above

Answer: Option A

Explanation:

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14. 

When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is given by

A. fsi = fs - 2fi
B. fsi = fs + 2fi
C.
D.

Answer: Option B

Explanation:

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15. 

It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude

A. will increase
B. will decrease
C. will remain constant
D. will reduce to negligible value

Answer: Option B

Explanation:

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