College : Psg Polytechnic College
Degree :DECE (Diploma in Electronics & Communication Engineering)
Semester : IV
Subject : G12404 Antennas & Microwave Engineering
Document Type : Model Question Paper
Website : psgpolytech.ac.in
Download Model/ Sample Question Papers : https://www.pdfquestion.in/uploads/psgpolytech.ac.in/6227-G12404.pdf
Antennas & Microwave Engineering Question Paper :
PSG POLYTECHNIC COLLEGE, COIMBATORE – 641 004
DIPLOMA EVEN SEMESTER EXAMINATIONS – APR 2014
Instructions :
Related : PSG Polytechnic College G12403 Microprocessor & Microcontroller Programming DECE Question Paper Model : www.pdfquestion.in/6229.html
1. Group A and Group B questions should be answered in the Main Answer book.
2. Answer any TEN questions in Group A. Each question carries two marks.
3. Answer ALL questions either (a) subdivision or (b) subdivision in Group B. Each question carries 14 marks.
G12404 Antennas And Microwave Engineering
MODEL QUESTION PAPER
Time : 3 Hours
Max.Marks : 100
Group – A Marks : 10 x 3 = 30
1. What is the Radiation resistance of an antenna it radiates a power of 120w and the current in it is 10amps.
2. Is antenna a transducer- Justify your answer.
3. How the EM wave radiation is done through the single wire-
4. How to analyze the regions of log-periodic antenna-
5. Calculate the λ and tilt angle of Rhombic antenna to operate at 20MHz if the elevation angle is 200.
6. What are the microwave antennas? Mention the advantages of the microwave antennas.
7. How does the transit time effect affect the high frequency amplifying devices?
8. List the application and limitations of the reflex klystron.
9. How does the function of the magnetic field in a TWT differ from its function in a magnetron?
10. Discuss the high frequency limitation of transistor comparing with vacuum tubes.
11. What are the types of parametric amplifier?
12. Using energy band diagrams, mention the tunnel diode characteristics.
13. Calculate the VSWR in db in a waveguide when the load is 3dB.
14. Mention the salient features of magic tee.
15. What are the components required for measuring the microwave frequencies?
Group– B Marks : 5 x 14 = 70
16. a) Find the directivity ,efficiency & effective area of an antenna if its Rr=80Ω,Rl=10Ω,power gain is 10dB & antenna operates at a frequency of 100MHz.
(OR)
b) Give the expression for the following:
1) Radiation pattern 2) Beam solid angle 3) Beam width
4) Directivity 5) Effective aperture
17.a) Explain in detail about the yagi-uda antenna and Derive the antenna parameters.
(OR)
b) How does the micro-strip antenna differ from other antennas? Explain the Micro strip antenna with neat sketch.
18. a) With the suitable sketches ,discuss the materials, construction & characteristics of microwave varactors.
(OR)
b) Sketch a gunn diode construction and describe it briefly.
19. a) Explain the operation of the reflex klystron oscillator. Why is the transit time so important in this devices?
(OR)
b) Discuss briefly three methods of beam forming in TWT.
20. a) How to measure the VSWR? Explain the measurement procedure in detail.
(OR)
b) i) Explain the Isolators and circulators. (5)
ii) How to measure the insertion loss and isolation of isolator and circulators? (9)
Digital Logic Design Question Paper :
Time : 3 Hours
Max.Marks : 100
Group – A Marks : 10 x 3 = 30
1. Write the advantages in operating as digital mode
2. Convert the following numbers into its decimal equivalent :
(i) (314)8 (ii) (1011 1100)2
3. Perform the following division in binary; 11011 / 101
4. Construct the two basic gates using universal gates.
5. State and its prove deMorgan’s theorem
6. Simplify the Boolean expressions to a minimum number of literals : xyz’+ x’yz+x’yz’.
7. Draw the block diagram of 4X1 multiplexer and write its truth table.
8. Using k-map, find the simplified Boolean equation for the given values.
F(a,b,c,d)=S(3,4,5,7,9,13,14,15)
9. Design a half adder and simplify using K-map.
10. Define level triggering and edge triggering.
11. Show the characteristics equation for the complement output of JK flip flop is Q’(t+1)=J’Q’+KQ’.
12. Draw the logic diagram of 4 bit SIPO shift register
13. Give the number of bytes stored in the memories listed below: (i) 8K*16 (ii) 2T*8
14. Compare the EPROM & Flash Memory
15. Draw the internal organization diagram of a 64X4 RAM