Punjab Technical University 2008 Bachelor of Fisheries Science (B.F.Sc.) SATELLITE & SPACE COMMUNICATION - Question Paper

SATELLITE & SPACE COMMUNICATION University ques. paper 2008

Time: three Hours June 2006 Max. Marks: 100

NOTE: There are nine ques. in all.
• ques. one is compulsory and carries 20 marks. ans to Q. 1. must be written in the space given for it in the ans book supplied and nowhere else.
• Out of the remaining 8 ques. ans any 5 ques.. every ques. carries 16 marks.
• Any needed data not explicitly given, may be suitably presumed and said.


Q.1 select the accurate or best option in the following: (2x10)

a. The 1st geostationary satellite, Early Bird, began to give telephone service across the Atlantic ocean, fulfilling clarke’s vision on satellite communication in the year

(A) 1960 (B) 1959
(C) 1969 (D) 1965

b. A remote sensing satellite is launched in

(A) Circular orbit. (B) Polar orbit.
(C) Geo Synchronous orbit. (D) Geo Stationary orbit.

c. The gain of a 10 m2 aperture at a frequency of 11 GHz is

(A) 51.2 dB (B) 52.3 dB
(C) 48.9 dB (D) 54.2 dB

d. The free space region of the earth’s atmosphere starts from a height of about

(A) 90 km from the earth’s surface.
(B) 300 km from the earth’s surface.
(C) 450 km from the earth’s surface.
(D) 600 km from the earth’s surface.

e. When a signal is transmitted through a link using pre-emphasis and de-emphasis at the source and the destination respectively, the transfer function of the system will be

(A) 0.5 (B) 2
(C) one (D) 2.5

f. The microwave device that can give amplification over a very wide bandwidth is

(A) Klystron (B) reflex klystron
(C) TWT (D) Magnetron.

g. If the bit rate for a TDMA circuit that uses QPSK modulation is 60.25 Mb/s, then the IF bandwidth needed with a roll off factor of 0.2 is

(A) 35.15 MHz (B) 36.15 MHz
(C) 29.12 MHz (D) 40 MHz

h. If the coding gain for a CDMA receiver is 27.2 dB, then the value of the chip rate for a bit rate of 9.6 kbps is

(A) 9.6 kcps (B) 9.5 mcps
(C) five mcps (D) 10 mcps

i. If the generator matrix for a (6,3) block code is , then the code word for the message block (1, 1, 0) is

(A) [110110] (B) [110111]
(C) [000010] (D) [110101]

j. Most VSAT systems operate with transmitter powers of

(A) six or eight watts (B) 10 or 15 watts

Earning:   Approval pending.