Satellite Communication MCQ Questions & Answers

21

A satellite is orbiting in the equatorial plane with a period from perigee to perigee of 12 h. If the eccentricity = 0.002, i = 0°, K₁ = 66063.17 km², µ = 3.99 × 10¹⁴ m³/s² and the earth's equatorial radius = 6378.14 km, the semi-major axis will be

A) 34232 km B) 30424 km C) 26612 km D) 22804 km

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Answer & Solution

Answer: Option C

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22

A monostatic pulsed radar operating at 30 GHz has a transmitter with 2 KW O/P power and an antenna with 30 dB gain. Minimum detectable signal in the receiver is -100 dBm. Determine the maximum range of the radar, if it is required to detect a target having radar cross section of 10 sq.m (consider log₁₀4π = 1.1).
Assume EM wave propagate under ideal conditions.

A) 10 km B) 21.5 km C) 56 km D) 100 km

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Answer & Solution

Answer: Option A

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23

Tropospheirc scatter communication is used for which frequency band?

A) HF B) VHF C) UHF D) VLF

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Answer & Solution

Answer: Option C

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24

The frequency range for satellite communication is

A) 1 kHz - 100 kHz B) 100 kHz - 1 MHz C) 10 MHz - 30 MHz D) 1 GHz - 30 GHz

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Answer & Solution

Answer: Option D

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25

One of the following satellite system being used for weather forecast application:

A) TIROS-N B) COMSAT C) GORIZONT D) SPOT

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Answer & Solution

Answer: Option A

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26

A satellite link frequency is expressed as $$\frac{4}{6}$$ GHz. It means that

A) 4 GHz is the downlink frequency and 6 GHz is the uplink frequency B) 4 GHz is the downlink frequency and 6 GHz is the uplink frequency C) The system operates at a mean frequency of 5 GHz D) 4 GHz frequency is used as backup for 6 GHz frequency

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Answer & Solution

Answer: Option B

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27

Ionosphere propagation is not possible for microwaves because

A) Microwaves will be fully absorbed by the ionosphere layers B) There will be an abrupt scattering in all direction C) Microwaves will penetrate through the ionosphere layers D) There will be dispersion of microwave energy

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Answer & Solution

Answer: Option C

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28

What does a link budget for satellite communication include?

A) Total cost of satellite B) Cost of satellite plus launch vehicle C) Signal and noise levels in dB D) Margins of error permitted

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Answer & Solution

Answer: Option C

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29

A company operating taxicabs communicates from its central office with the help of an antenna at the top of a 16 m tower. The antenna on the taxicabs is 1.44 m above the ground. The communication distance between the central office and a taxicab cannot exceed

A) 18.6 km B) 24.0 km C) 50.0 km D) 62.3 km

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Answer & Solution

Answer: Option A

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30

In the radar guidance of missiles, the technique makes use of two separate tracking beams, one tracking the missile and the other tracking the target. The missile is commanded to follow a trajectory based on the data from the two tracking radar beams. It is

A) Command guidance B) Active homing guidance C) Beam rider guidance D) Passive homing guidance

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Answer & Solution

Answer: Option A

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Satellite Communication MCQ Questions & Answers | ECE