Exercise: Exam Question Papers
Questions for: Exam Question Papers
If the scattering matrix [S] of a two port network is 
then the network is
then the network is
Answer: C
S11 โ S22 โ lossy [S]1 = [S] Reciprocal.
(29)13 รท (29)12 x (29)x = (23)16 Find x
Answer: B
(29)13 รท (29)12 x (29)x = (23)16
=> (35)10 , (33)10 x (29)x = (35)10
=> 
x(29)X = 35
โด (29)x = (33)10 => X = 12.
The signal x(t) is described by 
Two of the angular frequencies at which its fourier transform becomes zero are
Two of the angular frequencies at which its fourier transform becomes zero are
Answer: A
X(jฯ) = 
1.e-jฯt = 
At ฯ = 0 X(j0) = 2
At ฯ = p X(jp) = 0
ฯ = 2p X(j2p) = 0
{ x(n) } is a real-valued periodic sequence with a period N. x(n) and X(k) form N-point. Discrete Fourier Transform (DFT) pairs. The DFT Y(k) of the sequence. y(n) = 
x(r) X (n + r) is
x(r) X (n + r) is
A:
|X(k)|2
B: X(r) X(k + r)
X(r) X(k + r)C:
1
D:
0
Answer: A
Direct property
Convolution in time domain โ Multiplication in frequency domain.
Two coils X of 1000 turns and Y of 2000 turns are placed such that 60% of the flux produced by coil X links coil Y. A current of 1 A in coil X produces 0.1 wb flux. The mutual inductance between coils is
Answer: A
L2 = 0.1 X 4 = 0.4
M = kL1L2 = 0.6 0.4 X 0.1
= 0.6 X 0.2 = 0.12 .
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