# Engineering/Engineering Electronics Sample Test,Sample questions

## Question: ``` A signal is an energy signal when the signal has ```

1.Infinite energy

2.Finite energy

3. zero energy

4.None of the above

1.1/j Ï‰

2.1/2j Ï‰

3.j Ï‰

4.2j Ï‰

## Question: ``` 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

## Question: ``` Which of the following is the one of the property of unit impulse Î´(t) is ```

1.Î´(at) = a Î´(t)

2.Î´(at) = Î´(t)

3.Î´(at) = 1/a Î´(t)

4.Î´(at) = [Î´(t)]a

## Question: ``` 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

## Question: ```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

1.X(n00

2.0

3. "“x(n)

4. "“x(-n)

1.X(n)

2.0

3."“x(-n)

4.âˆž

## Question: `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

## Question: ```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

## Question: ```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

## Question: ```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

## Question: ```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

1.1 KHz.

2.2 KHz.

3. 3 KHz.

4.4 KHz.

## Question: ```Frequency and Time period are ______ ```

1.Proportional to each other

2. Inverse of each other

3.Same

4.None of the above

1.Noisy

2.Noiseless

3.Bandpass

4.Low-pass

1.Noisy

2.Noiseless

3.Bandpass

4.Low-pass

## Question: ```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

## Question: ```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

1. 2Ï€

2.Ï€/2

3. Ï€/2

4. Ï€/4

## Question: ```Which of the following can weaken a signal ```

1.Attenuation

2.Distortion

3.Noise

4.All of the above

## Question: ```_________ 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

## More MCQS

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