SIGNAL SYSTEM MCQS SET 09

SIGNAL SYSTEM MCQS SET 09

1. Under which conditions does an initially relaxed system become unstable ?
1) only if bounded input generates unbounded output
2) only if bounded input generates bounded output
3) only if unbounded input generates unbounded output
4) only if unbounded input generates bounded output
5) None of these
Answer:  1) only if bounded input generates unbounded output

2. All causal systems must have the component of
1) memory
2) time invariance
3) stability
4) linearity
5) None of these
Answer:  1) memory
 
3) A system is said to be defined as non causal, when
1) the output at the present depends on the input at an earlier time
2) the output at the present does not depend on the factor of time at all
3) the output at the present depends on the input at the current time
4) the output at the present depends on the input at a time instant in the future
5) None of these
Answer:  4) the output at the present depends on the input at a time instant in the future
 
4) A time invariant system is a system whose output
1) vanishes with a delay in input
2) remains same with a delay in input
3) decreases with a delay in input
4) increases with a delay in input
Answer:  2) remains same with a delay in input
 
5) A system which is linear is said to obey the rules of
1) homogeneity
2) scaling
3) additivity
4) both scaling and additivity
5) None of these
Answer:  4) both scaling and additivity
 
6) Double integration of a unit step function would lead to
1) an impulse
2) a parabola
3) a ramp
4) a doublet
5) None of these
Answer:  2) a parabola
 
7) A signal g(t) = A then g(t) is a
1) energy signal
2) power signal
3) neither energy nor power signal
4) insufficient data
5) both 1 & 2
Answer:  2) power signal
 
8 ) The Fourier series of an odd periodic function contains
1) odd harmonics only
2) even harmonics only
3) cosine harmonics only
4) sine harmonics only
5) None of these
Answer:  4) sine harmonics only
 
9 ) As per time displacement theorem in Laplace transformation, displacement in the time
domain by T becomes
1) division by s in the s domain
2) division by e-sT in the s domain
3) multiplication by s in the s domain
4) multiplication by e-sT in the s domain
5) None of these
Answer:  4) multiplication by e-sT in the s domain
 
10 ) The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0 ≤ t ≤ a and f(t) = 0 for t > a is
1) a step function
2) a pulse function
3) a shifted step function originating at t = a
4) unit step function
5) None of these
Answer:  2) a pulse function