Satellite Communication - Study Mode

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[#76] 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°, K 1 = 66063.17 km 2 , µ = 3.99 × 10 14 m 3 /s 2 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

Correct Answer

(C) 26612 km

[#77] 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 log 10 4π = 1.1). Assume EM wave propagate under ideal conditions.

(A) 10 km

(B) 21.5 km

(C) 56 km

(D) 100 km

Correct Answer

(A) 10 km

[#78] Tropospheirc scatter communication is used for which frequency band?

(A) HF

(B) VHF

(C) UHF

(D) VLF

Correct Answer

(C) UHF

[#79] 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

Correct Answer

(D) 1 GHz - 30 GHz

[#80] One of the following satellite system being used for weather forecast application:

(A) TIROS-N

(B) COMSAT

(C) GORIZONT

(D) SPOT

Correct Answer

(A) TIROS-N