Communication Engineering - Online Test
Q1. A discrete system is represented by the difference equation
It has initial condition X1(0) = 1; X2(0) = 0. The pole location of the system for a = 1, are
Answer : Option A
Explaination / Solution:
from the given difference equation,
Q2. A memory less source emits n symbols each with a probability p. The entropy of the source as a function of n
Answer : Option A
Explaination / Solution:
Q3. For linear time invariant systems, that are Bounded Input Bounded stable, which one of the following statement is TRUE?
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. Consider a signal defined by
Its Fourier Transform is
Answer : Option A
Explaination / Solution:
Q5. A signal flow graph of a system is given below
The set of equalities that corresponds to this signal flow graph is
Answer : Option C
Explaination / Solution:
Q6. The following discrete-time equations result from the numerical integration of the differential equations of an un-damped simple harmonic oscillator with state variables x and y. The integration time step is h.
For this discrete-time system, which one of the following statements is TRUE?
Answer : Option A
Explaination / Solution:
No Explaination.
Q7.
A rectangular waveguide of internal dimensions (a = 4 cm and b = 3 cm) is to be operated in TE11 mode. The minimum operating frequency is
Answer : Option A
Explaination / Solution:
Q8. A function y(t), such that y(0) = 1 and y(1) = 3e-1, is a solution of the differential equation 
Then y(2) is
Then y(2) is
Answer : Option B
Explaination / Solution:
Q9. One end of a loss-less transmission line having the characteristic impedance of 75Ω and length of 1 cm is short-circuited. At 3 GHz, the input impedance at the other end of transmission line is
Answer : Option D
Explaination / Solution:
Q10. The value of the integral
over the contour |z| = 1, taken in the anti-clockwise direction, would be
Answer : Option B
Explaination / Solution:
