The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ___________

In order to increase the bandwidth of tuned amplifiers, one can use: 1. Tuned circuit with inductance having high Q factor 2. Double tuned amplifier with two tuned circuits coupled by mutual inductance 3. Staggered tuned amplifiers in which different tuned circuits which are cascaded are tuned to slightly different frequencies

A

1, 2 and 3

B

1 and 2 only

C

2 and 3 only

D

1 and 3 only

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, 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

Consider the following statements related to oscillator circuits : 1. The tank circuit of a Hartley oscillator is made up of a tapped capacitor and a common inductor. 2. The tank circuit of a Colpitts oscillator is made up of a tapped capacitor and a common oscillator. 3. The Wien Bridge oscillator is essentially a two-stage amplifier with an RC bridge in the first stage, and, the second stage serving as an inverter. 4. Crystal oscillators are fixed frequency oscillators with a high Q-factor. Which of the following are true?

A

1, 2 and 3 only

B

2, 3 and 4 only

C

1, 2 and 4 only

D

1, 3 and 4 only

The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

A

To help the image frequency rejection

B

To permit easier tracking

C

Because otherwise an intermediate frequency could not be produced

D

To allow adequate frequency coverage without switching

A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is

A

750 kHz

B

900 kHz

C

1650 kHz

D

2100 kHz

In a radio receiver, we generally use ___________ oscillator as a local oscillator

A

Crystal

B

Wien-bridge

C

Phase-shift

D

Hartley

A signal containing only two frequency components (3 kHz and 6 kHz) is sampled at the rate of 8 kHz, and then passed through a low pass filter with a cut-off frequency of 8 kHz. The filter output

A

Is an undistorted version of the original signal

B

Contains only the 3 kHz component

C

Contains the 3 kHz component and a spurious component of 2 kHz

D

Contains both the components of the original signal and two spurious components of 2 kHz and 5 kHz

Assertion: The process of testing the frequency response of amplifier and filter can be done by sweep frequency generator that automatically varies its frequency over a pre-determined range. Reason: The sweep frequency generator should have a ramp generator which applies a linear ramp voltage the input of a voltage tuned oscillator (VTO).

A

Both A and R is true and R is the correct explanation of A

B

Both A and R is true and R is not the correct explanation of A

C

A is true but R is false

D

A is false but R is true

A communication receiver has an intermediate frequency of 9 MHz. What is the frequency of its oscillator when it is tuned to 15 MHz?

A

24 MHz

B

12 MHz

C

9 MHz

D

15 MHz

The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ___________

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