Communication Systems – Multiple Choice Questions (MCQs)

1. 85. What is the primary benefit of using Spread Spectrum techniques?

   • A. Increased data rate
   • B. Improved bandwidth efficiency
   • C. Resistance to interference and jamming
   • D. Lower power consumption

2. 86. In Time Division Multiple Access (TDMA)

   • A. different users are assigned different:
   • B. Frequencies
   • C. Time slots
   • D. Codes

3. 87. Code Division Multiple Access (CDMA) uses unique ________ for different users.

   • A. Frequencies
   • B. Time slots
   • C. Spreading codes
   • D. Antennas

4. 88. The concept of "fading" in wireless communication refers to:

   • A. Loss of signal strength due to distance
   • B. Variation in signal strength due to multipath propagation
   • C. Interference from other signals
   • D. Atmospheric absorption

5. 89. Diversity techniques in wireless communication are used to combat:

   • A. Noise
   • B. Fading
   • C. Interference
   • D. Distortion

6. 90. MIMO (Multiple-Input Multiple-Output) technology uses multiple antennas at both transmitter and receiver to improve:

   • A. Data rate and reliability
   • B. Power efficiency
   • C. Security
   • D. Cost

7. 91. The troposphere is the lowest layer of the atmosphere and is responsible for:

   • A. Ionospheric propagation
   • B. Ground wave propagation
   • C. Weather phenomena and troposcatter
   • D. Satellite communication