A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. A system is said to be defined as non causal, when
A. the output at the present depends on the input at an earlier time
B. the output at the present does not depend on the factor of time at all
C. the output at the present depends on the input at the current time
D. the output at the present depends on the input at a time instant in the future
2. The tree selected for the formation of state equations contains
A. all voltage sources
B. all capacitors
C. all inductors and current sources
D. all voltage sources and maximum number of capacitors
3. Unilateral Laplace Transform is applicable for the determination of linear constant coefficient differential equations with ________
A. Zero initial condition
B. Non-zero initial condition
C. Zero final condition
D. Non-zero final condition
4. Under which conditions does an initially relaxed system become unstable ?
A. only if bounded input generates unbounded output
B. only if bounded input generates bounded output
C. only if unbounded input generates unbounded output
D. only if unbounded input generates bounded output
5. Damped sinusoids are _____
A. sinusoid signals multiplied by growing exponentials
B. sinusoid signals divided by growing exponentials
C. sinusoid signals multiplied by decaying exponentials
D. sinusoid signals divided by decaying exponentials
6. Baseband transmission of a digital signal is possible only if we have a ____ channel.
A. low-pass
B. bandpass
C. low rate
D. high rate
7. What is the nature of Fourier representation of a discrete & aperiodic signal?
A. Continuous & periodic
B. Discrete and aperiodic
C. Continuous & aperiodic
D. Discrete & periodic
8. Generally, the convolution process associated with the Laplace Transform in time domain results into________
A. Simple multiplication in complex frequency domain
B. Simple division in complex frequency domain
C. Simple multiplication in complex time domain
D. Simple division in complex time domain
9. In a complex wave, the negative half of the wave is a reproduction of the positive half wave. Then
A. the wave does not contain triple harmonics
B. the wave does not contain odd harmonics
C. the wave does not contain even harmonics
D. the wave contains only fundamental and third harmonic
10. With respect to time, ________is the rate of change
A. Amplitude
B. Time
C. Frequency
D. Voltage
11. Where does the maximum value of auto-correlation function of a power signal occur?
A. At origin
B. At extremities
C. At unity
D. At infinity
12. In RLC circuits the state variables generally selected are
A. voltages across capacitors
B. currents through resistances and voltages across capacitors
C. currents through resistances and capacitances
D. currents through inductances and voltages across capacitances
13. According to Rayleighs theorem, it becomes possible to determine the energy of a signal by________
A. Estimating the area under the square root of its amplitude spectrum
B. Estimating the area under the square of its amplitude spectrum
C. Estimating the area under the one-fourth power of its amplitude spectrum
D. Estimating the area exactly half as that of its amplitude spectrum
14. FIR digital filter having __________ stability than FIR filter.
A. good stability
B. poor stability
C. stability not guarnteed
D. poor stability
15. 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
A. a step function
B. a pulse function
C. a shifted step function originating at t = a
D. unit step function
16. The Fourier series of an odd periodic function contains
A. odd harmonics only
B. even harmonics only
C. cosine harmonics only
D. sine harmonics only
17. Which among the following belongs to the category of non-recursive systems?
A. Non-causal IIR Systems
B. Causal IIR Systems
C. Non-causal FIR Systems
D. Causal FIR Systems
18. The theoretical power of white noise is
A. infninite
B. depend upon frequency of signal
C. finite
D. zero
19. What is the value of an area under the conditional PDF ?
A. Greater than 0 but less than 1
B. Greater than 1
C. Equal to 1
D. Infinite
20. A system which is linear is said to obey the rules of
A. homogeneity
B. scaling
C. additivity
D. both scaling and additivity
Dr K Chaudhry 5 Alpha Inmternational City, Fatehabad 125050 M: 9810570740, 9810571993facebook.com/doctorkc