Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (ECE)-Electronics And Communications Engineering 2020 December 6th Sem 71121 Microwave And Radar Engineering Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ECE) (2012 to 2017)
(Sem.?6)
MICROWAVE AND RADAR ENGINEERING
Subject Code : BTEC-601
M.Code : 71121
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks each and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1.
What is the need of isolator in microwave bench?
2.
Why is PIN diode used in microwave engineering?
3.
Which klystron is used as an amplifier only and not as an oscillator?
4.
What do you mean by transit time?
5.
What is the function of slow wave structure in TWT?
6.
What is the use of bends and corners in microwave?
7.
Define BWO.
8.
What is tunneling effect?
9.
Name the various scanning techniques.
10.
What is SWR?
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SECTION-B
11. Explain the slotted line method of VSWR measurement with basic experimental set-up
for high VSWR (S>20).
12. What do you understand by moving target detector? Explain.
13. How power can be measured using calorimeters?
14. A two cavity klystron amplifier has the following characteristics
Voltage gain = 15 dB
Input power= 5mW
Rsh of input cavity = 30 k
Rsh of output cavity = 40 k
Load impedance = 40 k
Determine :
a. The input rms voltage
b. The output rms voltage
15. Explain the working of phase shifter in detail.
SECTION-C
16. Explain working and construction of directional coupler and solve the s-matrix for the
same.
17. a. What is Gunn Effect? Explain Gunn domain in detail.
b. What is velocity modulation? What are the benefits obtained from velocity
modulation?
18. Define the following terms of magnetron :
a. favoured electrons
b. back heating effect
c. -mode oscillations
d. frequency pushing and frequency pulling
e. mode jumping
NOTE : Disclosure of identity by writing mobile number or making passing request on any
page of Answer sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021