Question 1 : A function f(x) is even, when?
1. f(x) = -f(x)
2. f(x) = f(-x)
3. f(x) = -f(x)f(-x)
4. f(x) = f(x)f(-x)
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Question 2 : Relationship between amplitude and frequency is represented by ________
1. Time-domain plot
2. Phase-domain plot
3. Frequency-domain plot
4. Amplitude-domain plot
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Question 3 : Agreement between communication devices are called ________
1. Transmission medium
2. Channel
3. Protocol
4. Modem
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Question 4 : Noise is added to a signal ________
1. In the channel
2. At receiving antenna
3. At transmitting antenna
4. During regeneration of information
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Question 5 : Sum of a periodic and aperiodic signal always be an aperiodic signal.
1. True
2. False
3.
4.
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Question 6 : What is the role of channel in communication system?
1. acts as a medium to send message signals from transmitter to receiver
2. converts one form of signal to other
3. allows mixing of signals
4. helps to extract original signal from incoming signal
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Question 7 : Notch is a ________
1. High pass filter
2. Low pass filter
3. Band stop filter
4. Band pass filter
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Question 8 : A heterodyne frequency changer is ________
1. Mixer
2. Demodulator
3. Modulator
4. Local Oscillator
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Question 9 : Superheterodyne principle provides selectivity at ________
1. RF stage
2. IF stage
3. Demodulating Stage
4. Audio Stage
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Question 10 : Figure of merit is ________
1. Ratio of output signal to noise ratio to input signal to noise ratio
2. Ratio of input signal to noise ratio to output signal to noise ratio
3. Ratio of output signal to input signal to a system
4. Ratio of input signal to output signal to a system
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