a) Reciprocal
f) a & c
b) Lossless
c) symmetric
d) a & b
e) b & c
g)none.
Answer : [f] a & c
2) For a resistive four port and three
port devices the amount of power lost at the junctions respectively.
a) 50 % , 65 %
b)67%, 50%
c) 33%, 67%
d) 67%, 33%
e) None
Answer : [b] 67%, 50%
3) The Isolation for port 2 and port 3
is present in.
a) Resistive T-Junction
d) H-plane T
b) Wilkinson power divider
e)Lossless T-junction
c) E-plane T
f)None
Answer : [b] Wilkinson power divider
4) The Percentage of power comes to
port 2 in equal split Resistive power divider when input is given at
port 1 is
a) 50%
b) 75%
c)25%
d) 15%
e)None
Answer : [c] 25%
5) In equal split lossless T-junction
power divider, what would be the characteristic Impedance value of
Quarter wave Transformer at port 2 match it to .
a) 0.707 Zo
b)Z0
c)1.712 Zo d) 2 Zo
e) None
Answer : [e] None
6) For a four port Directional coupler
in which all ports are matched and input is given at port 1. Voltage
at coupled port is 1V, Voltage at isolated port is 1mV, voltage at
through port is 3V now what is coupling.
a) 8.5 dB
b) 13.8 dB
c) 10.6 dB
d) 20 dB
e) None
Answer : [d] 20 dB
7) We use ................property of
ferrite material to make Isolator and circulator
a) Anisotropic
e) a, b &c
b) Non-linear
c)Non-homogenous
d)a & c
f)None
Answer : [a] Anisotropic
8) If we observe the graphical
representation of the S-parameters (in the range of 0 to -50 dB) of
equal split power divider with respect to frequency which parameter
will dominant in graph.
a) S12
b)S11
c)S23
d)S22
e)None
Answer : [a] S12
9)If a network is reciprocal and
lossless and s21 = 12∠90 0 is then find the return loss seen in
port 1 if port two is terminated with matched load
a)1.5 dB
b) 3 dB
c)-3 dB
d)-1.5 dB
Answer : [b] 3 dB
10. Find reflection co-efficient at
input port of a X-band air-filled Waveguide(Dimensions 1 * 0.5 inch)
of length λ0 4 which is terminated by a load of 500 ohm ,frequency
of operation is 10GHz
a) 0.243
b)0.033
c)0.818
d)Zero
Answer : [c] 0.818
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