Punjab State Board of Technical Education and Industrial Training 2011 Diploma Electronics and Communication Microwave and radar engineering - Question Paper

Duration: 3Hrs. Max.Marks:75


section-A [marks:1*15]
Q.1. Do as directed

a)Frequency range of Ku-band extends from________ to _________
b)A wave guide behaves as a filter.(T/F).
c)A directional coupler that has more than three holes is sometime preferred over a two hole coupler because it increases __________
d)Wave guides are not used at lower frequency because ________
e)Full form of IMPATT is ________
f)The dominant mode in a circular wave guide is ________
g)In a E-plane tee, the output of 2 arms will be ______ out of phase.
h)Relation ranging from group velocity and phase velocity is __________
i)Full form of PPI is_________
j)When the target is moving towards the CW doppler radar, the received frequency is ______ then the transmitted frequency.
k)A reflex klystron is often preferred wver the multicavity klystron amplifier because it________
l)Device which allow the use of a single antenna for transmission and reception is ________
m)Cut off wavelength of team mode in a rectangular wave-guide is _________
n)The input cavity in a cavity klystron is called __________ cavity.
o)Full form of VSAT is __________


section-B [marks:6*5=30]

Q.2.Attempt any 6 ques..

a)Discuss the advantages and disadvantages offered by the microwave over lower frequencies.

b)Briefly discuss the limitations of conventional devices like triode and transistors at higher frequencies.

c)Define phase velocity and group velocity.

d)Explain the construction and working of horn antenna.

e)What do you mean by TE, TM and TEM modes? Which mode of propagation is not possible in wave-guides?

f)Explain the operation and construction of E-plane tee and H-plane tee.

g)Explain the basic principles of a radar system also mention the limitations and applications of radar.

h)Describe the features of VSAT?


section-C [marks:3*10=30]

Q.3.Attempt any 3 ques..

a)With a neat sketch discuss the construction and operation of reflex klystron.

b)Draw the block diagram and discuss the principle of MTI.

c)Explain the construction and working of a circulator and an isolator.

d)Write short notes on any two:
1.directional coupler
2.parabolic reflector
3.slotted part
4.radar display

Earning:   Approval pending.