MCQ Assessment on Communication Systems

The main objective of a communication system is to:

• Modulate the signal

• Transmit power

• Transfer information

• Reduce noise

Which of the following is not an essential element of a communication system?

• Transmitter

• Receiver

• Power amplifier

• Channel

Analog signals are:

• Continuous in time and amplitude

• Discrete in time only

• Discrete in amplitude only

• Binary signals

Which of the following is true for digital communication?

• High bandwidth, low noise immunity

• Low bandwidth, high noise immunity

• Continuous signal processing

• Only used for audio

A signal is called periodic if:

• It repeats after a fixed time interval

• It changes randomly

• It has a constant frequency

• It has infinite energy

Which system has output depending only on present and past inputs?

• Causal system

• Non-causal system

• Linear system

• Static system

The tool used to analyze signals in frequency domain is:

• Laplace Transform

• Z-Transform

• Fourier Transform

• Time shift theorem

Which frequency component is obtained from a constant signal?

• High frequency

• Zero frequency (DC)

• Nyquist frequency

• Carrier frequency

Amplitude Modulation (AM) varies which parameter of the carrier?

• Frequency

• Phase

• Amplitude

• Bandwidth

What is the bandwidth of an AM signal with a 5 kHz modulating signal?

• 5 kHz

• 10 kHz

• 15 kHz

• 20 kHz