STUPIDSID
1 (a)
Solution for magnetic vector potential
5 M
1 (b)
Microstrip transmission lines.
5 M
1 (c)
Power dividers
5 M
1 (d)
Gryotrons.
5 M
2 (a)
Derive plane wave equations and explain the significance
10 M
2 (b)
Derive the expression for reflection and transmission coefficient of finite length
10 M
3 (a)
Derive the electro magnetic equations for TE modes in rectangular waveguide.
10 M
3 (b)
A TE11 mode propogating through a circular waveguide. The radius of the guide is 5 cm and the guide contains a air dielectric.
(i) Determine the cut off frequency
(ii) Determine the guid wavelength for an operating frequency of 3 GHz
(iii) Determine the wave impedance in the guide
(i) Determine the cut off frequency
(ii) Determine the guid wavelength for an operating frequency of 3 GHz
(iii) Determine the wave impedance in the guide
10 M
4 (a)
Explain various types of microwave solid state devices along with their applications
10 M
4 (b)
A Silicon n-p-n bipolar transistor operates in common-base mode at 300°K and has the following parametes:
Silicon instrinsic density : n1=1.5 ×1010 cm-3
Acceptor density in base region : Na=5 ×1016 cm-3
Donor density in emitter region : Nd=5 × 1018 cm-3
Hole Lifetime : ?p=1 ?s
Electron Lifetime : ?n = 1 ?s
Cross Section : A= 10-4 cm2
Base width : w=10-3 cm
Emitter length : LE = 10-2 cm
Determine : -
(i) The mobilities μn and μp
(ii) The diffusion coefficients Dn and Dp
(iii) The emitter efficiency factor y
(iv) The transport factor β
(v) The current gain α
Silicon instrinsic density : n1=1.5 ×1010 cm-3
Acceptor density in base region : Na=5 ×1016 cm-3
Donor density in emitter region : Nd=5 × 1018 cm-3
Hole Lifetime : ?p=1 ?s
Electron Lifetime : ?n = 1 ?s
Cross Section : A= 10-4 cm2
Base width : w=10-3 cm
Emitter length : LE = 10-2 cm
Determine : -
(i) The mobilities μn and μp
(ii) The diffusion coefficients Dn and Dp
(iii) The emitter efficiency factor y
(iv) The transport factor β
(v) The current gain α
10 M
5
Explain various avalanche transit-time devices with reference to construction, operation and applications.
20 M
6 (a)
A two cavity amplifier Klystron has the following characteristics :
Voltage gain : 15 dB
Input power : 5 mW
Total shunt inpedance of input cavity Rsh : 30 k?
Total shunt impedance of output cavity Rsh : 40 ?
Load impedance at o/p cavity RL : 40?
Determine :-
(i) The input Voltage (Vms)
(ii) The output Voltage (Vms)
(iii) The power delivered to the load in watts
Voltage gain : 15 dB
Input power : 5 mW
Total shunt inpedance of input cavity Rsh : 30 k?
Total shunt impedance of output cavity Rsh : 40 ?
Load impedance at o/p cavity RL : 40?
Determine :-
(i) The input Voltage (Vms)
(ii) The output Voltage (Vms)
(iii) The power delivered to the load in watts
10 M
6 (b)
Explain the concept velocity madulation and explain cylindrical magnetron.
10 M
7 (a)
Microwave filters
5 M
7 (b)
Travelling wave tube
5 M
7 (c)
Measurement of impedance .
5 M
7 (d)
Hybrid junctions.
5 M
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