Q.1
Rotation of a geosynchronous satellite means its
  • drift from stationary position
  • wobbling
  • three-axis stabilization
  • three-dimensional stabilization
Q.2
Is the geographical representation of a satellite antenna radiation pattern
  • Footprint
  • Spot
  • Earth
  • Region
Q.3
The smallest beam of a satellite antenna radiation pattern
  • Zone beam
  • Hemispheric beam
  • Spot beam
  • Global beam
Q.4
What is the first passive satellite transponder?
  • Sun
  • Early Bird
  • Score
  • Moon
Q.5
The most common device used as an LNA is
  • Zener diode
  • Tunnel diode
  • IMPATT
  • Shockley diode
Q.6
Earth station uses what type of antenna
  • Despun antenna
  • Helical antenna
  • Toroidal antenna
  • Cassegrain antenna
Q.7
Which of the following is the first active satellite?
  • Echo I
  • Telstar I
  • Early Bird
  • Sputnik I
Q.8
Considered as the unsolved problem in satellite system
  • Coverage
  • Cost
  • Access
  • Privacy
Q.9
What is a device that detects both vertically and horizontally polarized signals simultaneously?
  • Orthomode transducer
  • Crystal detector
  • Optoisolator
  • Isomode detector
Q.10
The radiation patterns of earth coverage antennas have a beamwidth of approximately
  • 21˚
  • 5˚
  • 17˚
  • 35˚
Q.11
The most effective anti jamming technique is
  • frequency hopping
  • spread-spectrum modulation
  • key leverage
  • once-only key
Q.12
What is the delay time for satellite transmission from earth transmitter to earth receiver?
  • 0.5 s
  • 1.0 s
  • 5 ms
  • 0.25 ms
Q.13
The first Philippine Mabuhay satellite has how many channels?
  • 30
  • 24
  • 48
  • 50
Q.14
What height must a satellite be placed above the surface of the earth in order for its rotation to be equal to earth’s rotation?
  • 26,426.4 miles
  • 27,426.4 miles
  • 23,426.4 miles
  • 22,426.4 miles
Q.15
The first satellite to receive and transmit simultaneously
  • Intelsat I
  • Agila I
  • Syncorn I
  • Telstar I
Q.16
What circuit is responsible in activating and deactivating adjacent antenna elements in a mobile satellite array?
  • Radial divider
  • Divider/combiner
  • Radial combiner
  • Radial multiplexer
Q.17
What kind of battery panels are used in some advance satellites
  • Germanium based panels
  • Silicon based panel
  • Galium Phosphate solar panel array
  • Galium Arsenide solar panel array
Q.18
How may satellite orbital slots are requested by the Philippine Government from ITU?
  • 2
  • 4
  • 6
  • 8
Q.19
What kind of battery used by older satellites?
  • Lithium
  • Leclanche
  • Hydrogen
  • Magnesium
Q.20
Which one of the following statements regarding compandor is FALSE?
  • It compresses the higher-amplitude parts of a signal before modulation and expands them back to normal again after demodulation.
  • It gives preferential treatment to the weaker parts of the signal
  • For weaker signals it gives a poor ratio of signal strength to quantizing error
  • Weaker signals, traverse more quantum steps than they would do otherwise and so quantizing error is reduced.
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