Electrical measurements-Digital Communications MCQs set/3 Sample Test,Sample questions

Question: ``` Ionospheric communication can take place in ```

1.High frequency band

2.Very high frequency band

3.Ultra high frequency band

4.Super high frequency band

Question: ``` Modulation channel consists of ```

1.Amplifier

2.Signal processing units

3.Amplifier & Signal processing units

4.None of the mentioned

Question: ``` The weighing matrix is ```

1.Positive quantity

2.Inverse of covariance matrix of the input vector

3.Positive quantity & Inverse of a covariance matrix of the input vector

4.None of the mentioned

Question: ```A band-pass signal can be down-converted using ```

1.Sine wave

2.Cosine wave

3.Time delayed wave

4.None of the mentioned

Question: ```A band-pass signal has a Fourier transform equal to ```

1.One

2.Zero

3.Infinity

4.Cannot be determined

Question: ```A base-band signal can be up-converted using ```

1.Sine wave

2.Cosine wave

3.Filtering

4.None of the mentioned

Question: ```A rectangular pulse of duration T is applied to a matched filter. The output of the filter is a ```

1.Rectangular pulse of duration T

2.Rectangular pulse of duration 2T

3.Triangular pulse

4.Sine function

Question: ```A signal can be recovered from its sample by using ```

1.Low pass filter

2.High pass filter

3.Band pass filter

4.Band stop filter

Question: ```A stationary stochastic process has ```

1.Finite energy signal

2.Infinite zero signal

3.Zero energy signal

4.None of the mentioned

Question: ```According to Sampling theorem ```

1.Ts is greater than 1/2fm

2.Ts is lesser than 1/2fm

3.Ts is equal to 1/2fm

4.Ts is lesser than or equal to 1/2fm

Question: ```ADSL has _____ information channels. ```

1.One

2.Three

3.Four

4.None of the mentioned

Question: ```Aliasing can be removed using ```

1.Prefiltering

2.Postfiltering

3.Prefiltering & Postfiltering

4.None of the mentioned

Question: ```Constellation diagram is plotted in ```

1.Constellation space

2. Signal space

3.Orthogonal space

4.Boundary space

Question: ```Cumulative distributive function is ```

1.Non negative

2.Non decreasing

3.Non negative & decreasing

4.None of the mentioned

Question: ```Flat top sampling or practical sampling has ```

1.Same frequency

2.Same amplitude

3.Same time difference

4.None of the mentioned

Question: ```For a periodic function, the spectral density and auto correlation functions form ```

1.Fourier transform pair

2.Laplace transform pair

3.Hilbert transform pair

4.Z transform pair

Question: ```Fourier transform of a signal gives the ```

1.Frequency content

2.Bandwidth

3.Frequency content & Bandwidth

4.None of the mentioned

Question: ```Ground wave communication occurs in ```

1.Low frequency band

2.Medium frequency band

3.Low & Medium frequency band

4.None of the mentioned

Question: ```If operating frequency bands are higher ______ is available. ```

1.Smaller bandwidth

2.Larger bandwidth

3.Smaller & Larger bandwidth

4.Cannot be determined

1.Stationary

2.Ergodic

3.Gaussian

4.Poisson

Question: ```In down-conversion multiplication with cosine wave is followed by ```

1.Low pass filter

2.High pass filter

3.Bandpass filter

4.Bandstop filter

1.Amplitude

2.Phase

3.Frequency

4.Time period

Question: ```In the digital communication system, signals in different frequency bands are ```

1.Orthogonal

2.Non orthogonal

3.Orthogonal & Non orthogonal

4.None of the mentioned

Question: ```Loop filter is a ______ used to reduce noise. ```

1.Low pass filter

2.High pass filter

3.Band pass filter

4.Band reject filter

1.True

2.False

Question: ```Multiplication of input signal with pulse train is done in ________ sampling. ```

1.Impulse sampling

2.Natural sampling

3.Flat top sampling

4.None of the mentioned

Question: ```Non uniform tree _____ bit rate. ```

1.Increases

2.Decreases

3.Does not affect

4.None of the mentioned

Question: ```Possible timing error detection methods are ```

1.Early late

2. Zero crossing

3.Early late & Zero crossing

4.None of the mentioned

Question: ```Properties of Fourier transform are ```

1.Duality property

2.Time shifting property

3.Modulation property

4.All of the mentioned

Question: ```Properties of impulse function are ```

1.Symmetry

2.Time scaling

3.Shifting

4.All of the mentioned

Question: ```Random things in a communication system are ```

1.Timing offset

2.Device frequency

3.Attenuation

4.All of the mentioned

Question: ```Sampling theorem is used for converting ```

1.Continuous time signal to discrete

2.Discrete to continuous time signal

3.Continuous time signal to discrete & vice versa

4.None of the mentioned

Question: ```Satellite communication takes place in ```

1.Ultra high frequency band

2.Super high frequency band

3.Ultra & Super high frequency band

4.None of the mentioned

Question: ```The auto-correlation of white noise is ```

1.A delta function

2.A constant

3.Gaussian

4.None of the mentioned

Question: ```The capacity of a channel is given by ```

1.Number of digits used in coding

2.Volume of information it can take

3.Maximum rate of information transmitted

4.Bandwidth requires information

Question: ```The effects of aliasing are ________ ```

1.Attenuation of high frequency spectral replicates

2.Non uniform spectral gain applied to desired baseband spectrum

3.Attenuation and non uniform spectral gain

4.None of the mentioned

Question: ```The fourier tranform of one impulse train is also another impulse train with a period of the output equal to the ```

1.Period of the input

2.Reciprocal of the period of input signal

3.Half the period of input

4.Twice the period of the input

Question: ```The line code has a zero dc component for pulse transmission of random binary data is ```

1.NRZ

2.RZ

3.Alternate mark inversion

4.None of the mentioned

Question: ```The output of sampling process are called as ________ ```

1.Pulse code modulation

2.Pulse amplitude modulation

3.Frequency modulation

4.Amplitude modulation

Question: ```The power spectral density function of the stochastic process is ```

1.Real

2.Odd

3.Real & odd

4.None of the mentioned

Question: ```The process in which the top of each pulse in the output samples retains the shape of the analog segment is called as ________ ```

1.Natural sampling

2.Ideal sampling

3.Aliasing

4.None of the mentioned

Question: ```The sampling process includes methods such as ```

1.Filtering

2.Sample and hold

3.Amplifying

4.None of the mentioned

Question: ```Two clock with rates T1 and T2 are incommensurate if its ratio is ```

1.Rational

2.Irrational

3.Equal

4.None of the mentioned

Question: ```Voltage generated by lightning is an example for ```

1.Energy signal

2.Power signal

3.Energy & Power signal

4.None of the mentioned

Question: ```Which are non negative functions? ```

1.PDF

2. PMF

3.PDF & PMF

4.None of the mentioned

Question: ```Which are orthonormal signal representation? ```

1.Sine and cosine at same frequency

2.Wavelets

3.Complex sinusoids at a different frequency

4.All of the mentioned

Question: ```Which can be used for periodic and non periodic? ```

1.Fourier series

2.Fourier transforms

3.Fourier series & transforms

4.None of the mentioned

Question: ```Which has minimum power loss during transmission? ```

1.Twisted Copper cable at 1KHz

2.Optical fiber

3.Twisted copper cable at 100KHz

4.Wave guide

Question: ```Which is practically realizable? ```

1.A train of pulses

2.Impulse train

3.All of the mentioned

4.None of the mentioned

Question: ```Which process is more economical? ```

1.Undersampling

2.Oversampling

3.Aliasing

4.None of the mentioned

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