AllInfoHub – MCQ Practice

Communication Systems – Multiple Choice Questions (MCQs)

73. Nyquist's criterion for zero ISI states that the pulse shape must have zero crossings at integer multiples of the:
- A. Bit rate
- B. Symbol rate
- C. Carrier frequency
- D. Sampling frequency
74. Raised cosine filter is commonly used in digital communication to reduce:
- A. Noise
- B. ISI
- C. Quantization error
- D. Aliasing
75. The purpose of channel coding in digital communication is to:
- A. Compress data
- B. Detect and correct errors
- C. Encrypt data
- D. Modulate the signal
76. Hamming codes are a type of:
- A. Error detection code
- B. Error correction code
- C. Source code
- D. Encryption code
77. What is the primary function of a modem?
- A. To convert analog signals to digital
- B. To convert digital signals to analog
- C. To modulate and demodulate signals
- D. To amplify signals
78. A constellation diagram is used to represent digital modulation schemes like:
- A. ASK and FSK
- B. PSK and QAM
- C. AM and FM
- D. PCM and DM
79. The bandwidth of a baseband signal is typically much ________ than the bandwidth of a modulated signal.
- A. Greater than
- B. Less than
- C. Equal to
- D. Independent of
80. An ideal channel adds only ________ to the signal.
- A. Noise
- B. Distortion
- C. Delay
- D. Attenuation
81. The maximum power transfer theorem applies to matching the impedance of the source to the impedance of the:
- A. Channel
- B. Receiver
- C. Antenna
- D. Power supply
82. The concept of "noise figure" is used for characterizing the noise performance of:
- A. Antennas
- B. Transmitters
- C. Receivers
- D. Channels
83. The input power of a communication receiver is usually measured in:
- A. Watts
- B. dBm
- C. Volts
- D. Amperes
84. A superheterodyne receiver reduces the problem of varying selectivity by:
- A. Using multiple filters
- B. Converting all incoming signals to a fixed IF
- C. Using a very wide bandwidth
- D. Employing AGC

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Communication Systems – Multiple Choice Questions (MCQs)

73. Nyquist's criterion for zero ISI states that the pulse shape must have zero crossings at integer multiples of the:

74. Raised cosine filter is commonly used in digital communication to reduce:

75. The purpose of channel coding in digital communication is to:

76. Hamming codes are a type of:

77. What is the primary function of a modem?

78. A constellation diagram is used to represent digital modulation schemes like:

79. The bandwidth of a baseband signal is typically much ________ than the bandwidth of a modulated signal.

80. An ideal channel adds only ________ to the signal.

81. The maximum power transfer theorem applies to matching the impedance of the source to the impedance of the:

82. The concept of "noise figure" is used for characterizing the noise performance of:

83. The input power of a communication receiver is usually measured in:

84. A superheterodyne receiver reduces the problem of varying selectivity by:

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