Deemed University 2009 A.M.I.E.T.E Electronics

AMIETE – ET (OLD SCHEME)

Code: AE20 Subject: MICROWAVE THEORY & TECHNIQUES
Time: three Hours 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 the best option in the following: (2 10)

a. The skin depth at 1000 MHz, in comparison with that at 500 MHz is

(A) 2. (B) .
(C) . (D) .

b. Which of the subsequent modes will not be supported by a rectangular waveguide?

(A) (B)
(C) (D)

c. The semiconductor diode which can be used in switching circuit of microwave range is

(A) PIN diode. (B) Varactor diode.
(C) Tunnel diode. (D) Gunn diode.

d. A full duplex round trip delay through geostationary synchronous satellite is approximately

(A) 300 ms. (B) 500 ms.
(C) 600 ms. (D) 800 ms.

e. A plane electromagnetic wave is travelling in an unbounded loss-less dielectric medium having and . The time averaged Poynting vector of the wave is five . The phase velocity (assuming velocity of light as ) is:

(A) . (B) .
(C) . (D) .

f. If the peak transmitted power of radar is increased by a factor of 81, then maximum range will be increased by a factor

(A) 3. (B) 9.
(C) 27. (D) 81.

g. A microwave junction is supposed to be matched at all ports, if in the S matrix

(A) All diagonal elements are zero.

Earning:   Approval pending.