Test Series - computer fundamental

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Test Number 72/95

Q: A coaxial cable has a bandwidth of _________ of megahertz.
A. 100
B. 150
C. 1000
D. 10000
Solution: A coaxial cable has a bandwidth of 100’s of Mhz. Baseband speed is in a few KHz. Multiplexing improves channel bandwidth utilization.
Q: In TDM, the samples occupy adjacent time slots.
A. True
B. False
C. none
D. ..
Solution: The statement is true. The TDM technique is based on sampling and they occupy adjacent slots and are transmitted in a sequence.
Q: The carrier wave is a _________
A. tan wave
B. cosec wave
C. sine wave
D. cot wave
Solution: The carrier wave is generally a sine wave. Carrier wave is used to transfer the signal from source to destination.
Q: Controlling the phase is referred as __________
A. modulation
B. half modulation
C. amplitude modulation
D. phase modulation
Solution: It is referred to as phase modulation. When there is a change in amplitude, it is referred to as amplitude modulation.
Q: A transmission mode that can transmit data in both the directions but transmits in only one direction at a time.
A. simplex
B. half duplex
C. full duplex
D. semi-duplex
Solution: The half duplex mode supports two way traffic but only in one direction at a time.
Q: A multiplexing technique based on sampling.
A. FDM
B. TDM
C. SDM
D. FM
Solution: TDM which stands for Time division multiplexing is based on sampling which is a modulation technique.
Q: An example of FDM:
A. broadcast radio
B. telephone
C. machines
D. semi-duplex
Solution: Broadcast radio is an example of FDM. This allows several messages to be translated from baseband.
Q: FDM stands for?
A. Frequency Division Multiplexing
B. Frequency Dependent Multiplexing
C. Frequency Diverged Multiplexing
D. Frequency Derived Multiplexing
Solution: FDM stands for Frequency Division Multiplexing. This allows several messages to be translated from baseband, where they are all in the same frequency.
Q: A modulation technique that improves channel bandwidth utilization.
A. direct
B. modulation
C. demodulation
D. multiplexing
Solution: Multiplexing is a modulation technique that improves channel bandwidth utilization.
Q: The purpose of communication system is to transfer information from _______ to the destination.
A. user
B. source
C. system
D. station
Solution: The answer is source. A communication system transfers information from source to the destination.

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