希戳相祟诺妻哦萍授罗分扮心
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起止时间:2021-04-19到2021-07-09
更新状态:每5天更新一次
1. Introduction to Wireless Communication quiz
1、 Wireless communication is a communication method that uses the characteristics of electromagnetic waves to propagate in space to exchange .
A:energy
B:information
C:matter
D:both matter and energy
答案: information
2、 Which one has the longest wavelength (i.e. the lowest frequency), among the following electromagnetic waves?
A:Microwave
B:Infrared ray
C:Visible light
D:Ultrashort wave
答案: Ultrashort wave
3、 Which description of the characteristics of millimeter wave communication is incorrect?
A:It has wide available spectrum.
B:It has large transmission loss and short transmission distance.
C:The RF devices are easy to be miniaturized.
D:The cost of RF devices is low.
答案: The cost of RF devices is low.
4、 The physicist who first confirmed that electromagnetic waves can propagate across space via experiments is
A:Michael Faraday
B:Isaac Newton
C:James Clerk Maxwell
D:Heinrich Rudolf Hertz
答案: Heinrich Rudolf Hertz
5、 Which is NOT the wireless communications systems?
A:Satellite communication system
B:Optical fiber communication system
C:Cellular mobile communication system
D:Bluetooth communication system
答案: Optical fiber communication system
6、 Which is NOT the feature of the first generation cellular mobile communications (1G)?
A:Analog communications
B:Only carry voice services
C:Low cost
D:Bulky terminals
答案: Low cost
7、 Which is NOT the standard of the third generation mobile communications (3G)?
A:GSM
B:WCDMA
C:TD-SCDMA
D:CDMA2000
答案: GSM
8、 Which one below does NOT belong to the millimeter wave band?
A:28 GHz
B:38 GHz
C:73 GHz
D:2.4 GHz
答案: 2.4 GHz
9、 Who established information theory in 1948?
A:Martin Lawrence Cooper
B:Claude Elwood Shannon
C:Andrew J. Viterbi
D:Michael Faraday
答案: Claude Elwood Shannon
10、 Which is NOT the feature of broadcast/television communications system?
A:Unidirectional transmission
B:Wide coverage
C:Low cost
D:Able to call or be called
答案: Able to call or be called
11、 In 2019, _____ cellular mobile communications system is put into commercial use in China.
A:2G
B:3G
C:4G
D:5G
答案: 5G
12、 5G system application scenarios include .
A:enhanced mobile broadband communications (eMBB)
B:massive machine-type communications (mMTC)
C:ultra-reliable low latency communications (uRLLC)
D:Wide area coverage communications
答案: enhanced mobile broadband communications (eMBB);
massive machine-type communications (mMTC);
ultra-reliable low latency communications (uRLLC)
13、 In wireless communications, which characteristics of electromagnetic waves can be used to carry information.
A:Amplitude
B:Frequency
C:Polarization mode
D:Polarization mode
答案: Amplitude;
Frequency;
Polarization mode;
Polarization mode
14、 Who are the inventors of the radiotelegraph?
A:James Clerk Maxwell
B:Heinrich Rudolf Hertz
C:Alexander Stepanovich Popov
D:Guglielmo Marconi
答案: Alexander Stepanovich Popov;
Guglielmo Marconi
15、 Which are the features of satellite communications?
A:Wide coverage
B:The cost of building is not related to the communication distance
C:Good resistance
D:Low transmission latency
答案: Wide coverage;
The cost of building is not related to the communication distance;
Good resistance
16、 Which are the features of wireless local area network (WLAN)?
A:High transmission rate
B:Mainly use licensed frequency bands
C:Good compatibility
D:Miniaturization and low cost
答案: High transmission rate;
Good compatibility;
Miniaturization and low cost
17、 Which are short-range wireless communication systems?
A:Bluetooth
B:RFID
C:UWB
D:NFC
答案: Bluetooth;
RFID;
UWB;
NFC
18、 Which statements about LTE are correct?
A:Including LTE FDD and TD-LTE two standards
B:High transmission rate
C:Flexible system deployment
D:Guaranteed quality of service
答案: Including LTE FDD and TD-LTE two standards;
High transmission rate;
Flexible system deployment;
Guaranteed quality of service
19、 The goals of wireless communication include_.
A:The goals of wireless communication include.
B:High transmission reliability
C:Low cost
D:Energy saving and environmental protection
答案: The goals of wireless communication include__.;
High transmission reliability;
Low cost;
Energy saving and environmental protection
2. Radio Propagation quiz
1、 Which is used to describe the relationship between transmitted power and received power in free-space propagation?
A:Friis’ Law
B:Huygens principle
C:Snell’s Law
D:Shannon Theory
答案: Friis’ Law
2、 For direct propagation, where the transceiver is at a certain distance, the relationship between path loss and carrier frequency is_____.
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