A signal is an energy signal when the signal has
1.Infinite energy
2.Finite energy
3. zero energy
4.None of the above
Determine the Fourier transform of unit step x(t) = u(t)
1.1/j ̉ۡ
2.1/2j ̉ۡ
3.j ̉ۡ
4.2j ̉ۡ
The equation y(t) = a x(t)+b comes under which system
1.Linear for any value of b
2.Linear if b > 0
3.Linear if b < 0
4.Non-linear
Which of the following is the one of the property of unit impulse δ(t) is
1.δ(at) = a δ(t)
2.δ(at) = δ(t)
3.δ(at) = 1/a δ(t)
4.δ(at) = [δ(t)]a
Which of the following time system operates with a continuous time signal & produces a continuous time output signal
1.Continuous time system
2.Discrete time system
3.Time invariant system
4.Time variant system
A continuous-time periodic signal x(t), having a period T, is convolved with itself. Then the resulting signal is
1. Not Periodic
2.D. Periodic having a period
3.Periodic having a period T
4.Periodic having a period T/2
A discrete signal is said to be even or symmetric if x(-n) is equal to
1.X(n00
2.0
3. "“x(n)
4. "“x(-n)
A discrete signal is said to be odd or asymmetric if x(-n) is equal to
1.X(n)
2.0
3."“x(-n)
4.∞
A signal is a power signal when the signal has
1.Infinite average power
2.finite average power
3.Zero average power
4.None of the above
A system is defined as
1.Any combination of components or elements that has a useful function.
2.Any combination of elements that has a single input and a single output.
3.Any closed volume for which all the inputs and outputs are known
4. Any physical quantity that varies with time,space or any other independent variable
A system is said to be casual if the output of the system depends on the
1.Past & Present Inputs
2.Present Input
3.Future Input
4.Past & Future Inputs
A system is said to be dynamic if the output of the system depends on the A. Past InputB. Future InputC. Present InputD. Present & Future Inputs
1.Past Input
2.Future Input
3.Present Input
4.Present & Future Inputs
A system is said to be stable if the bounded input to the system produces
1.Bounded output
2.Non bounded output
3.Inbound output
4.Outbound output
For a band pass signal extends from 1 KHz to 2 KHz. Then the minimum sampling frequency that needed to retain all information of the sampled signal is
1.1 KHz.
2.2 KHz.
3. 3 KHz.
4.4 KHz.
Frequency and Time period are ______
1.Proportional to each other
2. Inverse of each other
3.Same
4.None of the above
Nyquist bit rate formula defines the theoretical maximum bit rate for which channel
1.Noisy
2.Noiseless
3.Bandpass
4.Low-pass
Nyquist bit rate formula defines the theoretical maximum bit rate for which channel
1.Noisy
2.Noiseless
3.Bandpass
4.Low-pass
The given system is characterized by the differential equation d2y(t)/dt2-dy(t)/dt-2y(t)= x(t). Then the system is:
1.Linear and stable
2. Linear and unstable
3.Nonlinear and unstable
4.Nonlinear and stable
The function which relates output of a system to the input(signal) of a system is
1.Periodic function
2. Non-periodic function
3.Transfer function
4.None of the above
The Parseval's theorem states that the energy in the time-domain representation of a signal is equal to the energy in the frequency domain representation normalized by
1. 2À
2.À/2
3. À/2
4. À/4
Which of the following can weaken a signal
1.Attenuation
2.Distortion
3.Noise
4.All of the above
_________ is defined as any physical quantity that varies with time, space or any other independent variable
1.Signal
2.system
3.signals & system
4.None of the above