1. ……………… means sending a digital signal over a channel without changing the digital signal to an analog signal.
A) Baseband transmission
B) Broadband transmission
C) Digital transmission
D) Analog transmission
2. In …………………. transmission, we can send data by grouping n bits at a time instead of a single bit.
A) parallel
B) serial
C) analog
D) digital
3. In ………………….. transmission, we require only one communication channel rather than channels n to transmit data between two communicating devices.
A) parallel
B) serial
C) analog
D) digital
4. ……………… is the loss of energy as the signal propagates outward, where the amount of energy depends on the frequency.
A) Noise
B) Delay distortion
C) Attenuation distortion
D) Dispersion
5. If the ……………….. is too much, the receiver may not be able to detect the signal at all or the signal may fall below the noise level.
A) Noise
B) Delay
C) Dispersion
D) Attenuation
6. Attenuation can be also expressed in decibel(dB) and commonly used because.
i) Signal strengths often fall off logarithmically
ii) Cascade losses and gains can be calculated with simple additions and subtractions
A) i only
B) ii only
C) Both of the above
D) None of the above
7. ……………… occurs due to velocity of propagation the frequency varies. Thus various frequency components of a signal arrive at the receiver at different times.
A) Noise
B) Delay distortion
C) Attenuation distortion
D) Dispersion
8. ………….. can be defined as unwanted energy from source other than the transmitter.
A) Dispersion
B) Attenuation Distortion
C) Delay distortion
D) Noise
9. …………… noise is caused by the random motion of the electrons in a wire and is avoidable.
A) Thermal
B) Intermodulation
C) Cross talk
D) Impulse
10. Thermal noise is often referred to as …………… noise, because it affects uniformly the different frequencies.
A) Black
B) White
C) Gray
D) Blue
11. ………………….. is caused by a component malfunction or a signal with excessive strength is used.
A) Thermal
B) Intermodulation
C) Cross talk
D) Impulse
12. ……………….. is a noise where foreign signal enters the path of the transmitted signal.
A) Thermal
B) Intermodulation
C) Cross talk
D) Impulse
13. …………….. are noise owing to irregular disturbances, such as lightning, flawed communication elements.
A) Thermal
B) Intermodulation
C) Cross talk
D) Impulse
14. ……………… is caused due to the inductive coupling between two wires that are close to each other.
A) Thermal
B) Intermodulation
C) Cross talk
D) Impulse
15. Sometime when talking over the telephone, you can hear another conversation in the background which is ………………..
A) Thermal
B) Intermodulation
C) Cross talk
D) Impulse
16. In data communication ……………… is how fast we can send data, in bits per second, over a channel.
A) data rate
B) data flow
C) data speed
D) baud rate
17. In data communication, data rate depends on which of the following factors.
i) The bandwidth available ii) The level of the signals iii) The level of noise
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii
18. …………….. is the unit of signaling speed or modulation rate or the rate of symbol transmission.
A) Data rate
B) Bit rate
C) Signal to Noise Ratio
D) Baud rate
19. A …………… is a discrete time signal having finite number of amplitude.
A) Analog signal
B) Digital signal
C) Hybrid signal
D) Discrete signal
20. The range of frequencies that contain the information is called as the ………..
A) Bandwidth
B) Bit rate
C) Signal to Noise Ratio
D) Baud rate
Answers
1. A) Baseband transmission
2. A) parallel
3. B) serial
4. C) Attenuation distortion
5. D) Attenuation
6. C) Both of the above
7. B) Delay distortion
8. D) Noise
9. A) Thermal
10. B) White
11. B) Intermodulation
12. C) Cross talk
13. D) Impulse
14. C) Cross talk
15. C) Cross talk
16. A) data rate
17. D) All i, ii and iii
18. D) Baud rate
19. B) Digital signal
20. A) Bandwidth
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