Question Paper: Microwave & Radar Engineering : Question Paper Dec 2016 - Electronics & Telecomm (Semester 7) | Mumbai University (MU)
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## Microwave & Radar Engineering - Dec 2016

### Electronics & Telecomm. (Semester 7)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

1(a) What is meant by RADAR range?
(5 marks) 00

1(b) Explain the working of Hybrid ring.
(5 marks) 1451

1(c) Explain travelling wave tube as an amplifier.
(5 marks) 991

1(d) Explain working of IMPATT.
(5 marks) 00

2(a) Match a load impedance ZL = 60j80 to a $50 \ohm$ line using a double stub tuner. The stubs are open circuited and are spaced $\lambda / 8$ part. The match frequency is 2GHz.
(10 marks) 1454

2(b) With a neat functional diagram expalin the networking principle of Cylindrical Magnetron.
(10 marks) 1470

3(a) Discuss the various frequency bands and characteristics of microwaves.
(10 marks) 00

3(b) Explain Doppler Shift and its role in pulsed and CW RADAR.
(10 marks) 1002

4(a) Explain instrument landing system for aircraft navigation.
(10 marks) 1009

4(b) Radar operating at 1.5GHz uses a peak pulse power of 2.5 MW and has a range of 100 nmit for objects whose radar cross section is 1m2If the minimum receivable power of the receiver is 2×10-13 Watt, what is the smallest diameter of the antenna reflector could have assuming it to be a full paraboloid with η=0.65
(10 marks) 1008

5(a) State various modes of Gunn diode and explain any one of them in detail.
(10 marks) 998

5(b) With block diagram explain the MTI radar system. Give its limitations.
(10 marks) 1004

6(a) Give the working principle difference between Two Cavity Klystron and Reflex Klystron.
(10 marks) 00

6(b) Write a short note on rectangular waveguide.
(10 marks) 00