In superhetrodyne receiver, the input at mixer stage is ___________

In an AM system receiver. the mixer translates the carrier frequency fc to a fixed intermediate frequency of 450 kHz. Given a broadcast signal of frequency 900 kHz. What is the corresponding image frequency when a superhetrodyne receiver is employed with local oscillator frequency greater than the broadcast signal frequency?

A

900 kHz

B

1800 kHz

C

800 kHz

D

1350 kHz

In the last month the company decided to increase the cost of its mixer by 10 percent. What is the present price of the mixer? I. The cost of mixer and juicer together was Rs 2850 a month ago. II. The amount of 10% increase on the mixer comes to Rs 220.

A

If the data in statement I alone are sufficient to answer the question

B

If the data in statement II alone are sufficient answer the question

C

If the data either in I or II alone are sufficient to answer the question;

D

If the data even in both the statements together are not sufficient to answer the question

In a receiver, if the noise figure of the mixer stage in the receiver is 7 dB, then the equivalent noise temperature is given that the receiver is operating at 290 K:

A

1163 K

B

1789 K

C

1000 K

D

1234 K

Read the following statements and mark your answer according to the given below.
1. For variable input APP = MPP in the first stage.
2. For variable input APP = MPP at the end of the 1^st stage.
3. For variable input APP = MPP at the start of 2^nd stage.
4. For variable input APP = MPP in the 2^nd stage.

A

1 and 3

B

1 and 4

C

2 and 3

D

2 and 4

A mixer stage has a noise figure of 20 dB. This mixer stage is preceded by an amplifier which has a noise figure of 9 dB and an available power gain of 15 dB. The overall noise figure referred to the input is

A

11.07

B

18.23

C

56.43

D

97.38

Most of the amplification in a superhetrodyne receiver occurs at ___________ stage

A

IF

B

RF amplifier

C

Audio amplifier

D

Detector

Which of the following statements are correct with reference to superheterodyne receivers? (i) The main advantage of the superheterodyne receiver is its better tracking (ii) The main advantage of the superheterodyne receiver is an improvement in sensitivity (iii) The image channel rejection in superheterodyne receiver comes from IF stages only (iv) The image channel rejection in the superheterodyne receiver comes from the RF stage only Choose the correct answer from the code given below:

A

(i) and (ii) are correct

B

(ii) and (iii) are correct

C

(ii) and (iv) are correct

D

(i) and (iv) are correct

In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because ___________

A

The difference frequency is closer to oscillator frequency

B

Lower frequencies are easier to amplify

C

Only the difference frequency can be modulated

D

None of the above

The superhetrodyne principle provides selectivity at ___________ stage

A

RF

B

IF

C

audio

D

Before RF

If the third order input intercept point of a mixer is 13 dBm and if the mixer has a conversion loss of 6 dBm, then the third order intercept point at the output is:

A

3 dBm

B

7 dBm

C

4 dBm

D

2 dBm

In superhetrodyne receiver, the input at mixer stage is ___________

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