### 22414 Data Communication and Computer Network (DCC) | Unit 1 MCQs Department of Computer Engineering

Class: SE Computer & IT

Subject: 22414 Data Communication and Computer Network (DCC)

MCQ Question Bank with Answers

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Unit I

1. In a _______ connection, more than two devices can share a single link.
(a) Point-to-point
(b) Primary
(c) Multi-point
(d) Secondary

1. Communication between a computer and a keyboard involves ______________
transmission
(a) Full-duplex
(b) Half-duplex
(c) Simplex
(d) None of these

1. The information to be communicated in a data communications system is the ________
a. Medium
b. Protocol
c. Transmission
d. Message

1. Frequency of failure and network recovery time after a failure are measures of the
_______ of a network.
a. Performance
b. Security
c. Reliability
d. Feasibility

1. In _______ transmission, the channel capacity is shared by both communicating devices at all times.
a. Full-duplex
b. Simplex
c. Half-duplex
d. Half-Simplex

1. An unauthorized user is a network _______ issue.
a. Performance
b. Reliability
c. Security
d. All of the above

1. A television broadcast is an example of _______ transmission.
a. Half-duplex
b. Full-duplex
c. Simplex
d. Automatic

1. A _______ connection provides a dedicated link between two devices.
a. Multi-point
b. Point-to-Point
c. Primary
d. Secondary

2. Before data can be transmitted, they must be transformed to ________.
a. Electromagnetic signals
b. Periodic signals
c. Aperiodic signals
d. Low-frequency sine waves

1. A periodic signal can always be decomposed into ________.
a. Exactly an odd number of sine waves
b. A set of sine waves, one of which must have a phase of 0°
c. A set of sine waves
d. None of the above

1. . In a frequency-domain plot, the horizontal axis measures the ________.
a. Frequency
b. Peak amplitude
c. Phase
d. Slope

1. In a time-domain plot, the vertical axis is a measure of ________.
a. Frequency
b. Phase
c. Amplitude
d. Time

1. As frequency increases, the period ________.
a. Decreases
b. Increases
c. Remains the same
d. Doubles

1. When propagation speed is multiplied by propagation time, we get the ________.
a. Throughput
b. Wavelength of the signal
c. Distance a signal or bit has traveled
d. Distortion factor

1. Propagation time is ________ proportional to distance and ________ proportional to propagation speed.
a. Inversely; directly
b. Inversely; inversely
c. Directly; inversely
d. Directly; directly

1. Wavelength is ________ proportional to propagation speed and ________ proportional to period.
a. Directly; directly
b. Inversely; directly
c. Directly; inversely
d. Inversely; inversely

1. Which of the following can be determined from a frequency-domain graph of a signal?
a. Phase
b. Power
c. Frequency
d. Bandwidth

1. Which of the following can be determined from a frequency-domain graph of a signal?
a. Phase
b. Bandwidth
c. Power
d. All the above

2. In a frequency-domain plot, the vertical axis measures the ________.
a. Frequency
b. Peak amplitude
c. Phase
d. Slope

1. Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.
a. One-half
b. Twice
c. The same as
d. Indeterminate from

1. The wavelength of green light in air is ________ the wavelength of green light in fiber-optic cable.
a. Greater than
b. Less than
c. Equal to
d. None of the above

1. A sine wave is ________.
a. Aperiodic and continuous
b. Periodic and discrete
c. Aperiodic and discrete
d. Periodic and continuous

2. _______ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.
a. Distortion
b. Noise
c. Decibel
d. Attenuation

3. _______ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.
a. Attenuation
b. Noise
c. Distortion
d. Decibel

4. _______ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.
a. Attenuation
b. Noise
c. Distortion
d. Decibel

1. The ________ has units of meters/second or kilometers/second.
a. Throughput
b. Propagation time
c. Propagation speed
d. (b) and (c)

1. ______ has units of bits/second.
a. Throughput
b. Propagation speed
c. Propagation time
d. (b) and (c)

2. The ________ has units of seconds.
a. Throughput
b. Propagation time
c. Propagation speed
d. (a) and (b)

1. The wavelength of a signal depends on the ________.
a. Frequencies of the signal
b. Medium
c. Phase of the signal
d. (a) and (b)

2. Block coding can help in _______ at the receiver.
a. Synchronization
b. Error detection
c. Attenuation
d. (a) and (b)

1. In _______ transmission, bits are transmitted simultaneously, each across its own wire.
a. Parallel
b. Asynchronous serial
c. Synchronous serial
d. (a) and (b)

2. Unipolar, bipolar, and polar encoding are types of _______ encoding.
a. Block
b. Line
c. NRZ
d. Manchester

1. _______ encoding has a transition at the middle of each bit.
a. RZ
b. Manchester
c. Differential Manchester
d. All the above

1. ______ encoding has a transition at the beginning of each 0 bit.
a. Differential Manchester
b. RZ
c. Manchester
d. All the above

2. PCM is an example of _______ conversion.
a. Analog-to-analog
b. Analog-to-digital
c. Digital-to-digital
d. Digital-to-analog

3. One factor in the accuracy of a reconstructed PCM signal is the _______.
a. Number of bits used for quantization
b. Signal bandwidth
c. Carrier frequency
d. Baud rate

1. In asynchronous transmission, the gap time between bytes is _______.
a. Fixed
b. A function of the data rate
c. Variable
d. Zero

1. Synchronous transmission does not have _______.
a. A start bit
b. A stop bit
c. Gaps between bytes
d. All the above

1. Which encoding type always has a nonzero average amplitude?
a. Polar
b. Bipolar
c. Uni-polar
d. All the above

1. Which of the following encoding methods does not provide for synchronization?
a. Manchester
b. NRZ-L
c. RZ
d. NRZ-I

1. Which encoding method uses alternating positive and negative values for 1s?
a. Manchester
b. AMI
c. NRZ-I
d. RZ

1. In PCM, an analog-to- _______ conversion occurs.
a. Analog
b. Digital
c. QAM
d. Differential

1. RZ encoding involves _______ signal levels.
a. Five
b. Four
c. Three
d. Two

1.  In _______ transmission, a start bit and a stop bit frame a character byte.
a. Synchronous serial
b. Asynchronous serial
c. Parallel
d. (a) and (b)

1.  The Nyquist theorem specifies the minimum sampling rate to be_______.
a. Twice the bandwidth of a signal
b. Twice the highest frequency of a signal
c. Equal to the lowest frequency of a signal
d. Equal to the highest frequency of a signal

1.  Pulse rate is always _______ the bit rate.
a. Less than
b. Less than or equal to
c. Greater than
d. Greater than or equal to

1. AM and FM are examples of ________ modulation.
a. Analog-to-analog
b. Analog-to-digital
c. Digital-to-digital
d. Digital-to-analog

1. In QAM, both phase and ________ of a carrier frequency are varied.
a. Frequency
b. Bit rate
c. Amplitude
d. Baud rate

1. Which of the following is most affected by noise?
a. PSK
b. FSK
c. QAM

1. ASK, PSK, FSK, and QAM are examples of ________ modulation.
a. Analog-to-analog
b. Analog-to-digital
c. Digital-to-digital
d. Digital-to-analog

1. As the bit rate of an FSK signal increases, the bandwidth ________.
a. Remains the same
b. Decreases
c. Increases
d. Doubles

1. In 16-QAM, there are 16 ________.
a. Phases
b. Combinations of phase and amplitude
c. Amplitudes
d. bps

1. Which modulation technique involves tribits, eight different phase shifts, and one amplitude?
a. FSK
c. 4-PSK
d. 8-PSK

2. A modulated signal is formed by ________.
a. Changing the carrier wave by the modulating signal
b. Quantization of the source data
c. Changing the modulating signal by the carrier wave
d. Sampling at the Nyquist frequency

1. When an ASK signal is decomposed, the result is ________.
a. An infinite number of sine waves
b. Always one sine wave
c. Always two sine waves
d. None of the above

1. The bandwidth of an FM signal requires 10 times the bandwidth of the _______ signal.
a. Bipolar
b. Sampling
c. Carrier
d. Modulating

1. Modulation of an analog signal can be accomplished through changing the ________ of the carrier signal.
a. Amplitude
b. Frequency
c. Phase
d. Any of the above

1. For a telephone line, the bandwidth for voice is usually _______ the bandwidth for data.
a. Less than
b. Greater than
c. Twice
d. Equivalent to

1. For a given bit rate, the minimum bandwidth for ASK is ________ the minimum bandwidth for FSK.
a. Less than
b. Equivalent to
c. Greater than
d. Twice

1. 