Electrical measurements/Digital Communications MCQs set-11 Sample Test,Sample questions

Question:
 In TDM, at the receiver end, ____ filter is used.

1.Low pass

2.High pass

3. Band pass

4.Band stop


Question:
A PAM signal can be detected using

1.Low pass filter

2.High pass filter

3.Band pass filter

4.All pass filter


Question:
A PWM signal can be generated by

1.An astable multi vibrator

2.A monostable multi vibrator

3.Integrating a PPM signal

4.Differentiating a PPM signal


Question:
An amplifier uses ______ to take input signal.

1.DC power

2.AC power

3.DC & AC power

4.None of the mentioned


Question:
Analogue switches provides

1.Good bandwidth

2.Low distortion

3.Low cost

4.All of the mentioned


Question:
Class B linear amplifiers have maximum power efficiency of

1.50%

2.75%

3.78.5%

4.None of the mentioned


Question:
Coherent demodulation of FSK signal can be performed using

1.Matched filter

2.BPF and envelope detectors

3.Discriminator

4.None of the mentioned


Question:
Delta modulation is ______ conversion.

1.Analog to digital

2.Digital to analog

3.Analog to digital and digital to analog

4.None of the mentioned


Question:
Flat top sampling of low pass signals

1.Gives rise to aperture effect

2.Implies over sampling

3.Leads to aliasing

4.Introduces delay distortion


Question:
For non coherent reception of PSK _____ is used.

1.Differential encoding

2.Decoding

3.Differential encoding & Decoding

4.None of the mentioned


Question:
For which quantization process is used?

1.Amplitude discretization

2.Time discretization

3.Amplitude & Time discretization

4.None of the mentioned


Question:
Free space in idealization which consists

1.Transmitter

2.Receiver

3.Transmitter & Receiver

4.None of the mentioned


Question:
In a delta modulation system, granular noise occurs when the

1.Modulating signal increases rapidly

2.Pulse rate decreases

3.Pulse amplitude decreases

4.Modulating signal remains constant


Question:
In an ideal TDM system, the cross correlation between two users of the system is

1.1

2.0

3.Infinity

4.-1


Question:
In bipolar codes, pulses can be

1.Positive

2.Negative

3.Absent

4.All of the mentioned


Question:
In channel encoding procedure

1.Redundancy bits are added

2.Errors are corrected

3.Redundancy bits are added & Errors are corrected

4. None of the mentioned


Question:
In finite state machines, output is predicted using

1.Past output

2.Present input

3.Past output & Present input

4.None of the mentioned


Question:
In M-ary FSK as M tends to infinity, probability of error tends to

1.Infinity

2.Unity

3.Zero

4.None of the mentioned


Question:
In M-ary FSK, as M increases error

1.Increases

2.Decreases

3.Does not get effected

4.Cannot be determined


Question:
In TCM channel capacity can be increased.

1.True

2.False


Question:
In TCM the signals are decoded using

1.Soft decision decoders

2.Hard decision decoders

3. Soft & Hard decision decoders

4.None of the mentioned


Question:
In time division system, the actual switch is called as

1.Speech memory

2.Cross point

3.Connecting point

4.None of the mentioned


Question:
In time division, connection is established using

1.Data exchange

2.Galvanic connection

3.Data exchange & Galvanic connection

4.None of the mentioned


Question:
Modulation process corresponds to ______ the amplitude, frequency or phase.

1.Switching

2.Keying

3.Switching or keying

4.None of the mentioned


Question:
Modulation process includes

1.Analog to digital conversion

2.Digital to analog conversion

3.All of the mentioned

4.None of the mentioned


Question:
Operations performed by switching system

1.Path establishment

2.Information exchange

3.Tariff computation

4.All of the mentioned


Question:
PCM includes the process of

1.Amplitude discretization

2.Time discretization

3.Amplitude & Time discretization

4.None of the mentioned


Question:
Properties used to determine stream’s fidelity

1.Sampling rate

2.Bit depth

3.Sampling rate & Bit depth

4.None of the mentioned


Question:
Source of noise in delta modulation is

1.Granularity

2.Slope overload

3.Granularity & Slope overload

4.None of the mentioned


Question:
Space division has dedicated

1.Paths

2.Time slots

3.Paths & Time slots

4.None of the mentioned


Question:
Switching exists in

1.Point to point communication

2.Broadcast communication

3.Point to point & Broadcast communication

4.None of the mentioned


Question:
TDM is less immune to cross-talk in channel than FDM.

1.True

2.False


Question:
TDM requires

1.Constant data transmission

2. Transmission of data samples

3.Transmission of data at random

4.Transmission of data of only one measured


Question:
The demodulator in delta modulation technique is

1.Differentiator

2.Integrator

3.Quantizer

4.None of the mentioned


Question:
The TCM decoder uses

1.Minimum likelihood detector

2.Maximum likelihood detector

3.Does not use redundant bits

4.None of the mentioned


Question:
The use of non uniform quantization leads to

1.Reduction in transmission bandwidth

2.Increase in maximum SNR

3.Increase in SNR for low level signals

4.Simplification of quantization process


Question:
Time division multiplexing uses

1.High pass filter

2.Commutator

3.High pass filter & Commutator

4.None of the mentioned


Question:
To achieve high signal to noise ratio, delta modulation must use

1.Under sampling

2.Over sampling

3.Aliasing

4.None of the mentioned


Question:
Transmission bandwidth depends on

1.Rate of signalling

2.Density of signal points

3.Reduced distance

4.None of the mentioned


Question:
Trellis coded modulation scheme

1.Has memory

2. Is memory-less

3.Needs more bandwidth

4.None of the mentioned


Question:
When probability of receiving a symbol is 1 then how much information will be obtained?

1.Little information

2.Much information

3.No information

4.None of the mentioned


Question:
Which determines the error performance in TCM?

1.Reduced distance

2.Free distance

3.Bandwidth

4.None of the mentioned


Question:
Which generates high distortion?

1.Class A

2.Class B

3.Class C

4.Class AB


Question:
Which has 50% maximum power efficiency?

1.Class A

2.Class B

3.Class AB

4.None of the mentioned


Question:
Which has higher error probability performance?

1.Uni-polar base-band signalling

2.Bipolar base-band signalling

3.ASK

4.FSK


Question:
Which has same probability of error?

1.ASK and FSK

2.ASK and PSK

3.PSK and FSK

4. None of the mentioned


Question:
Which has the maximum power efficiency?

1.Class A

2.Class B

3.Class C

4.Class AB


Question:
Which modulation technique have the same bit and symbol error probability?

1.BPSK

2.DPSK

3.OOK

4.All of the mentioned


Question:
Which of the following requires a synchronizing signal?

1.Single channel PPM system

2.PAM

3.DM

4.All of the mentioned


Question:
Which provides more secure communication?

1.CDMA

2.FDMA

3.TDMA

4.None of the mentioned


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