Let x1(t) and x2(t) be periodic signals with fundamental periods T1 and T2 respectively. Which of the following must be a rational number for x(t)=x1(t)+x2(t) to be periodic?(a) T1+T2(b) T1-T2(c) T1/T2(d) T1*T2This question was posed to me during an interview.This interesting question is from Classification of Signals in section DSP – Basic Signaling of Digital Signal Processing

Let x1(t) and x2(t) be periodic signals with fundamental periods T1 an

1.	Let x1(t) and x2(t) be periodic signals with fundamental periods T1 and T2 respectively. Which of the following must be a rational number for x(t)=x1(t)+x2(t) to be periodic?(a) T1+T2(b) T1-T2(c) T1/T2(d) T1*T2This question was posed to me during an interview.This interesting question is from Classification of Signals in section DSP – Basic Signaling of Digital Signal Processing
Answer» Right option is (C) T1/T2 The explanation: Let T be the PERIOD of the signal x(t) =>x(t+T)=x1(t+mT1)+x2(t+nT2) THUS, we MUST have mT1=nT2=T =>(T1/T2)=(k/m)= a rational number.

Discussion

No Comment Found

Related InterviewSolutions

What is the physical device that performs an operation on the signal?(a) Signal source(b) System(c) Medium(d) None of the mentionedThis question was posed to me in examination.Asked question is from Signals, Systems and Signal Processing in portion DSP – Basic Signaling of Digital Signal Processing
Which of the following wave is known as “amplitude modulated wave” of x(t)?(a) C.x(t) (where C is a constant)(b) x(t)+y(t)(c) x(t).y(t)(d) dx(t)/dtThis question was posed to me during an online interview.I would like to ask this question from Signals, Systems and Signal Processing in portion DSP – Basic Signaling of Digital Signal Processing
Which of the following block is not required in digital processing of a RADAR signal?(a) A/D converter(b) D/A converter(c) DSP(d) All of the mentionedThis question was posed to me by my school teacher while I was bunking the class.My doubt stems from Signals, Systems and Signal Processing topic in portion DSP – Basic Signaling of Digital Signal Processing
What are the important block(s) required to process an input analog signal to get an output analog signal?(a) A/D converter(b) Digital signal processor(c) D/A converter(d) All of the mentionedI have been asked this question in an interview for job.My question is based upon Signals, Systems and Signal Processing in division DSP – Basic Signaling of Digital Signal Processing
If a signal x(t) is processed through a system to obtain the signal (x(t)^2), then the system is said to be ____________(a) Linear(b) Non-linear(c) Exponential(d) None of the mentionedThis question was posed to me in exam.The query is from Signals, Systems and Signal Processing topic in chapter DSP – Basic Signaling of Digital Signal Processing
If x(n)=(0,0,1,1,1,1,1,0) then x(3n+1) is?(a) (0,1,0,0,0,0,0,0)(b) (0,0,1,1,1,1,0,0)(c) (1,1,0,0,0,0,0,0)(d) None of the mentionedThis question was addressed to me in a job interview.This interesting question is from Signals, Systems and Signal Processing topic in chapter DSP – Basic Signaling of Digital Signal Processing
If x(n)=(0,0,1,2,3,4,0,0) then x(n-2) is?(a) (0,0,2,4,6,8,0,0)(b) (0,0,1,2,3,4,0,0)(c) (1,2,3,4,0,0,0,0)(d) (0,0,0,0,1,2,3,4)This question was addressed to me in exam.My question comes from Signals, Systems and Signal Processing in portion DSP – Basic Signaling of Digital Signal Processing
Which of the following is common independent variable for speech signal, EEG and ECG?(a) Time(b) Spatial coordinates(c) Pressure(d) None of the mentionedI got this question in an online quiz.My question is taken from Signals, Systems and Signal Processing topic in division DSP – Basic Signaling of Digital Signal Processing
If x(n)=(0,1,2,3,3,0,0,0) then x(2n) is?(a) (0,2,4,6,6,0,0,0)(b) (0,1,2,3,3,0,0,0)(c) (0,2,3,0,0,0,0,0)(d) None of the mentionedI have been asked this question in my homework.The above asked question is from Signals, Systems and Signal Processing topic in division DSP – Basic Signaling of Digital Signal Processing
Which property does y(t)=x(1-t) exhibit?(a) Time scaling(b) Time shifting(c) Reflecting(d) Time shifting and reflectingI have been asked this question in an online quiz.I need to ask this question from Signals, Systems and Signal Processing topic in chapter DSP – Basic Signaling of Digital Signal Processing

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment