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Worksheetscommunication engineering online activity
Total questions: 11
Worksheet time: 7mins
Characteristics of radio receivers
SELCTIVITY & SENSITIVITY
NOISE FIGURE & FIDELITY
BOTH OPTION 1 & 2
ONLY OPTION 1
Intermediate frequency of AM receiver(write the value only no need of unit) (a) kHz
In superheterodyne receiver
the RF stage has better selectivity than IF stage
the IF stage has better selectivity than RF stage
the IF stage has same selectivity than RF stage
none of these
The function of AM detector circuit
rectify the input signal
discard the carrier
provide audio signal
modulate the carrier
Define fidelity
Equally amplifies all the signal frequencies at receiver
Ability of receiver to select wanted signal from various incoming signal
Minimum magnitude of input signal required to produced a specified output
Ability to amplify weak signals
how was today's session
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Excellent
OK
Which oscillator is used as a local oscillator in radio receiver?
CRYSTAL OSCILLATOR
HARTELY OSCILLATOR(LC OSCILLATOR)
WEIN BRIDGE OSCILLATOR
PHASE SHIFT OSCILLATOR
RF amplifiers are used in radio receivers for
improved image frequency rejection
improved rejection of adjacent unwanted signals
prevention of re-radiation of the local oscillator through the antenna of the receiver
all of the above
In a communication system, noise is most likely to affect the signal
at transmitter
at the destination
in the channel
in the information source
In a radio receiver, if the intermediate frequency is too high
Selectivity will be poor
Tracking difficulties will be least
Adjacent channel rejection will improve
all the above
In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be(only value required) (a) kHz
