SIGNAL SYSTEM MCQS SET 10

SIGNAL SYSTEM MCQS SET 10

1) Which one of the following is correct? Energy of a power signal is
1) finite
2) zero
3) infinite
4) between 1 and 2
5) None of these
Answer:  3) infinite
 
2) Auto correlation function
1) is an even function of t
2) is an odd function of t
3) may be an even or odd function of t
4) is both an odd and even function of t
5) None of these
Answer:  1) is an even function of t
 
3) In RLC circuits the state variables generally selected are
1) voltages across capacitors
2) currents through resistances and voltages across capacitors
3) currents through resistances and capacitances
4) currents through inductances and voltages across capacitances
5) None of these
Answer:  4) currents through inductances and voltages across capacitances
 
4) The theoretical power of white noise is
1) infninite
2) depend upon frequency of signal
3) finite
4) zero
5) None of these
Answer:  2) depend upon frequency of signal
 
5) If f(t) is an even function, the coefficients Fn in the exponential form of Fourier series
1) are real
2) are imaginary
3) are complex
4) may be real or imaginary
5) None of these
Answer:  1) are real
 
6) For a ______ channel, we need to use the Shannon capacity to find the maximum bit
rate.
1) noisy
2) noiseless
3) bandpass
4) low-pass
5) low rate
Answer:  1) noisy
 
7 ) For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.
1) noisy
2) noiseless
3) bandpass
4) low-pass
5) low rate
Answer:  2) noiseless
 

8) Baseband transmission of a digital signal is possible only if we have a ____ channel.
1) low-pass
2) bandpass
3) low rate
4) high rate
5) None of these
Answer:  1) low-pass
 

9) The _____ of a composite signal is the difference between the highest and the lowest
frequencies contained in that signal
1) frequency
2) period
3) bandwidth
4) amplitude
5) None of these
Answer:  3) bandwidth
 

10) A sine wave in the ______ domain can be represented by one single spike in the _____domain.
1) time; frequency
2) frequency; time
3) time; phase
4) phase; time
5) None of these
Answer:  1) time; frequency