Related Questions

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
In a broadcast superheterodyne receiver, the
A Local oscillator operates below the signal frequency
B Mixer input must be tuned to the signal frequency
C Local oscillator frequency is normally double the IF
D RF amplifier normally works at 455 kHz above the carrier frequency
Four defensive football players are chasing the opposing wide receiver, who has the ball. Calvin is directly behind the ball carrier. Jenkins and Burton are side by side behind Calvin. Zeller is behind Jenkins and Burton. Calvin tries for the tackle but misses and falls. Burton trips. Which defensive player tackles the receiver?
A Burton
B Zeller
C Jenkins
D Calvin
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
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
Which of the following function creates a CSS gradient image that can be used anywhere an image URL is required, including background-image, border-image, and list-style properties?
A canvas
B gradient
C animation
D color
The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to
A Reduce the spurious frequency problem
B Increase the frequency stability of the synthesizer
C Reduce the number of decades
D Reduce the number of crystals required
Which blood group is the universal blood receiver in human body ?
A A + ve
B B + ve
C O + ve
D AB + ve
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have
A A long time constant
B Low-pass filters
C The shortest possible time
D The restricted high-frequency response
A receiver has poor IF selectivity. It will therefore also have poor
A Blocking
B Double-spotting
C Diversion reception
D Sensitivity

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