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Communication Systems

This test covers concepts of Circuits & Networks, DSP, Wireless Communication

20 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following are applications of Infrared and Millimeter waves?

  1. Short range communication/ TV remote control
  2. Personal Area Networks
  3. Data communication/Internet
  4. Satellite communication
  1. 1, 2 & 4
  2. 1 & 2
  3. 3 & 4
  4. 1 & 4
Question 2 Multiple Choice (Single Answer)

Which mode of wireless communication is the most suitable to prevent eavesdropping/ security, i.e. they cannot pass through solid objects?

  1. Radio Transmission
  2. Satellite Communication
  3. Microwave Communication
  4. Infrared Transmission
Question 3 Multiple Choice (Single Answer)

Which of the following has the longest range as well as a point to point transmission mode?

  1. Radio Transmission
  2. Infrared Transmission
  3. Microwave Transmission
  4. Bluetooth
Question 4 Multiple Choice (Single Answer)

Which of the following makes use of one point access system?

  1. Cellular System
  2. Satellite Communication System
  3. Wireless LAN
  4. Paging System
Question 5 Multiple Choice (Single Answer)

Four modes of wireless communication are given below:

  1. Bluetooth
  2. FM radio
  3. Wi-Fi
  4. Infrared

Compare the ranges of the given modes of wireless applications.

  1. 2 > 3 > 4 > 1
  2. 3 > 2 > 1 > 4
  3. 3 > 2 > 4 > 1
  4. 2 > 3 > 1 > 4
Question 6 Multiple Choice (Single Answer)

In cellular systems, the process when a mobile subscriber moves from one cell to the other and the corresponding base station also changes is known as

  1. Co-channel interference
  2. Cellular interference
  3. CDMA
  4. Handoff
Question 7 Multiple Choice (Single Answer)

What is the correct sequence in which message is coupled from system to channel?

  1. Message-> Coding-> Modulation-> Power Amplifier-> Antennae
  2. Coding-> Message-> Modulation-> Power Amplifier-> Antennae
  3. Message-> Coding-> Power Amplifier-> Antennae-> Modulation
  4. Message-> Modulation-> Coding-> Power Amplifier-> Antennae
Question 8 Multiple Choice (Single Answer)

Which of the following is a multiplexing technique in cellular systems?

  1. TDMA
  2. CDMA
  3. FDMA
  4. All of the above
Question 9 Multiple Choice (Single Answer)

Which of the following is not a characteristic of wireless LAN?

  1. It uses the concept of one access point.
  2. The data generally breaks up into packets.
  3. Channel access is shared.
  4. Very high speed for all applications
Question 10 Multiple Choice (Single Answer)

Which of the following transmissions is generally optimized for one-way transmission?

  1. Cellular System
  2. Satellite Communication System
  3. WLAN
  4. Microwave Transmission
Question 11 Multiple Choice (Single Answer)

In the sensor networks, the nodes which are small sensing devices with some built-in intelligence are known as

  1. comparator
  2. motes
  3. astable multivibrator
  4. PLL
Question 12 Multiple Choice (Single Answer)

Which of the following systems will be suitable for weather forecasting/earthquake forecasting?

  1. Adhoc networks
  2. Sensor networks
  3. Distributed control networks
  4. UWB
Question 13 Multiple Choice (Single Answer)

Which of the following is not a characteristic of sensor networks?

  1. Energy constraint
  2. Low per node data rate
  3. Highly correlated data in time and space
  4. Dynamic topology
Question 14 Multiple Choice (Single Answer)

Having more and more power for transmission is not a viable solution to increase SNR in wireless channels because

  1. power does not change the SNR
  2. of radiation hazards
  3. more power changes the frequency of transmission
  4. power decreases with distance of transmission
Question 15 Multiple Choice (Single Answer)

Which of the following is an example of fixed wireless communication system?

  1. Microwave links
  2. Cellular systems
  3. Satellite communication
  4. Paging systems
Question 16 Multiple Choice (Single Answer)

Consider the following two statements:

  1. Bluetooth at a time has a limitation on number of devices it can connect to.
  2. Ultra Wideband devices do not have limitation on number of devices they can connect to at a time.

Mark the correct alternative from the given options.

  1. Only statement 1 is correct.
  2. Only statement 2 is correct.
  3. Both statements (1) and (2) are correct.
  4. Neither (1) nor (2) statement is correct.
Question 17 Multiple Choice (Single Answer)

Which of the following generally has Bursty traffic?

  1. Voice
  2. Data
  3. Videos
  4. Music
Question 18 Multiple Choice (Single Answer)

Some charcteristics of a system are given below:

  1. Exceptional multi-path immunity
  2. Low power consumption
  3. No need of license to operate
  4. Low bandwidth
  5. Very low interference
  6. Low data-rate

Which of the given characteristics are true about Ultra wide band networks?

  1. All are the characterstics of UWB.
  2. 1, 3, 4 & 5
  3. 1, 2, 3 & 5
  4. 2, 4 & 6
Question 19 Multiple Choice (Single Answer)

Fourier Series of Even periodic functions contain

  1. only cosine terms
  2. only sine terms
  3. only constant terms
  4. all cosine, sine and constant terms
Question 20 Multiple Choice (Single Answer)

For a given power, which of the following statements is correct?

  1. Larger frequency waves travel longer distance than smaller frequency waves.
  2. Smaller frequency waves travel longer distance than larger frequency waves.
  3. Distance travelled by the wave depends on power and not on frequency of transmission.
  4. It can be either smaller frequency waves or larger frequency waves, which travel longer depending on the channel conditions.
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