WorksheetsQUIZ 1
Total questions: 25
Worksheet time: 15mins
Which block converts information into an electrical signal?
Channel
Transducer
Receiver
Destination
The medium through which the signal travels is called
Source
Transducer
Channel
Encoder
The function of a receiver is to
Amplify noise
Modulate the signal
Transmit data
Recover original message signal
Which block is mainly affected by noise?
Source
Transmitter
Channel
Destination
Communication using continuous signals is called
Digital communication
Analog communication
Wireless communication
Optical communication
Which of the following is a digital communication system?
FM radio
AM radio
Telephone (old)
Computer network
Optical fiber communication is an example of
Wireless communication
Analog communication
Wired communication
Radio communication
Bluetooth communication is
Wired
Wireless
Optical
Satellite
A regenerative repeater performs
Amplification, reshaping and retiming
Amplification only
Filtering only
Modulation
Noise generated outside the communication system is called
Internal noise
External noise
Thermal noise
Shot noise
Atmospheric noise is an example of
Internal noise
External noise
Circuit noise
Semiconductor noise
Thermal noise depends on
Frequency only
Temperature only
Bandwidth and temperature
Resistance only
Shot noise occurs due to
Random electron motion
Sudden temperature change
Imperfect modulation
Atmospheric conditions
Noise power is directly proportional to
Resistance
Bandwidth
Signal power
Frequency squared
Unit of Noise Figure is
Watt
Hz
dB
Joule
Noise Figure represents
Signal amplification
Noise reduction
Degradation of SNR
Bandwidth efficiency
A signal with frequency range starting from zero is called
Bandpass signal
Carrier signal
Baseband signal
Modulated signal
AM signal is an example of
Baseband signal
Bandpass signal
DC signal
Random signal
Energy signals have
Infinite energy and finite power
Finite energy and zero average power
Finite energy and finite power
Infinite power
Energy Spectral Density represents
Energy vs time
Energy vs frequency
Power vs time
Power vs frequency
Power signals have
Finite energy
Zero power
Infinite energy
Zero frequency
Unit of Power Spectral Density is
AW
J/Hz
W/Hz
dB
The thermal noise power in a system having bandwidth 10 kHz at 300 K is
(k = 1.38×10^−23 J/K)
4.14×10^−17 W
4.14×10^−18 W
4.14×10^−16 W
4.14×10^−15 W
A system has input SNR = 30 dB and output SNR = 20 dB. Noise figure is
3 dB
10 dB
50 dB
20 dB
If noise figure is 5 dB, the noise factor is approximately
1.58
2
3.16
5
