In a broadcast superheterodyne receiver, the

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 broadcast superheterodyne receiver, having no RF amplifier, the IF = 455 kHz. What is the image frequency if the receiver is tuned to 1000 kHz?

A

1455 kHz

B

1910 kHz

C

545 kHz

D

2455 kHz

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 a broadcast superheterodyne receiver, the ____________

A

Local oscillator always operates below the frequency of transmitted signal

B

Input of mixer must be tuned to the signal frequency

C

Local oscillator frequency should be double than that of IF

D

RF amplifier normally works at 455 KHz above the carrier frequency

Which type of OSPF network will elect a backup designated router?
1. Broadcast multi-access
2. Non-broadcast multi-access
3. Point-to-point
4. Broadcast multipoint

A

1 and 2

B

3 and 4

C

3 only

D

None of the above

Which of the following are benefits of VLANs?
1. They increase the size of collision domains.
2. They allow logical grouping of users by function.
3. They can enhance network security.
4. They increase the size of broadcast domains while decreasing the number of collision domains.
5. They simplify switch administration.
6. They increase the number of broadcast domains while decreasing the size of the broadcast domains.

A

1 and 5

B

2 and 4

C

1, 3 and 5

D

2, 3 and 6

Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from

A

Gain variation over the frequency coverage range

B

Insufficient gain and sensitivity

C

Inadequate selectivity at high frequencies

D

Instability

One of the main functions of the RF amplifier in a superheterodyne receiver is to

A

Provide improved tracking

B

Permit better adjacent-channel rejection

C

Increase the tuning range of the receiver

D

Improve the rejection of the image frequency

The image frequency of a superheterodyne receiver

A

Is created within the receiver itself

B

Is due to insufficient adjacent channel rejection

C

Is not rejected be the IF tuned circuits

D

Is independent of the frequency to which the receiver is tuned

A superheterodyne receiver receives signal within frequency range of 120 to 180 MHz. Then the required Intermediate frequency is _________

A

30MHz

B

60MHz

C

90MHz

D

50MHz

In a broadcast superheterodyne receiver, the

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