Electrical measurements-Digital Communications MCQs set/16 Sample Test,Sample questions

Question:
Analog source coding method are

1.Temporal waveform coding

2.Spectral waveform coding

3.Model based coding

4.All of the mentioned


Question:
Attenuation is a function of

1.Channel length

2.Transmission media

3.Signal frequencies

4.All of the mentioned


Question:
Attributes of ISDN have

1.Definition

2.Allowable values

3.Definition & Allowable values

4.None of the mentioned


Question:
Binomial distribution deals with

1.Continuous random variable

2.Discrete random variable

3.Continuous & Discrete random variable

4. None of the mentioned


Question:
Channel bonding provides

1.Higher data rate

2.Lower data rate

3.Does not affect data rate

4.None of the mentioned


Question:
Channel can provide connectivity to

1.Point to point

2.1 to many

3.Many to many

4.All of the mentioned


Question:
Channel noise is

1.Additive

2.White and stationary

3.Has infinite bandwidth

4.All of the mentioned


Question:
Circuit switched connection is provided for

1.Voice

2.Data

3.Voice & Data

4.None of the mentioned


Question:
Decision making needs

1.Priors

2.Likelihoods

3.Priors & Likelihoods

4.None of the mentioned


Question:
Embedding is a form of

1.Abstraction

2.Layering

3.Entity sharing

4.None of the mentioned


Question:
Entities also does

1.Error correction

2.A/D

3.D/A

4.All of the mentioned


Question:
For neyman pearson decision criterion, which are important?

1.Probability of false alarm

2.Probability of miss

3.Probability of false alarm & miss

4.None of the mentioned


Question:
Gaussian process is a

1.Wide sense stationary process

2.Strict sense stationary process

3.All of the mentioned

4.None of the mentioned


Question:
In channel, delay is

1.Fixed

2.Variable

3. Fixed & Variable

4.None of the mentioned


Question:
In layering, n layers provide service to

1.n layer

2.n-1 layer

3.n+1 layer

4.none of the mentioned


Question:
In matched filter _______ is performed.

1.Convolution

2.Correlation

3.Convolution & Correlation

4.None of the mentioned


Question:
In poisson distribution mean is ______ variance.

1.Greater than

2.Lesser than

3.Equal to

4.Does not depend on


Question:
In transmission media, the symbol type is generally

1.Analog

2.Digital

3.Analog & Digital

4.None of the mentioned


Question:
ISDN integrates speech and data on

1.Different lines

2.Same lines

3.Different & Same lines

4.None of the mentioned


Question:
ISDN is a

1.Packet switched network

2.Circuit switched telephone network

3.Packet switched & Circuit switched telephone network

4.None of the mentioned


Question:
Noise is _____ in nature.

1.Random

2.Systematic

3.Random or Systematic

4.None of the mentioned


Question:
Packet switched connection is provided for

1.Voice

2.Data

3.Voice & Data

4.None of the mentioned


Question:
Routing is performed only centrally.

1.True

2.False


Question:
S-interface is a _______ bus.

1.Two wire bus

2.Four wire bus

3.Single wired bus

4.None of the mentioned


Question:
Stochastic process are

1.Random in nature

2.Are function of time

3.Random in nature and are a function of time

4. None of the mentioned


Question:
Stochastic processes are

1.Strict sense stationary process

2.Wide sense stationary process

3.All of the mentioned

4.None of the mentioned


Question:
Symbol error probability can also be determined using upper bound.

1.True

2.False


Question:
T interface is the serial interface between

1.Computing device and terminal adapter

2.Terminal adapter and exchange unit

3.Exchange unit and network terminating unit

4.Computing device and exchange unit


Question:
The radiation loss increases as

1.Frequency increases

2.Frequency decreases

3.Does not depend on frequency

4.None of the mentioned


Question:
The services provided by ISDN

1.Bearer service

2.Teleservice

3.Secondary service

4.All of the mentioned


Question:
The source output in PCM and DPCM is quasi stationary.

1.True

2.False


Question:
The time required to transmit frame depends on

1.Frame size

2.Channel capacity

3.Frame size & Channel capacity

4.None of the mentioned


Question:
The type of distortion which occurs in delta modulation is

1.Slope overload distortion

2.Granular noise

3.Slope overload distortion & Granular noise

4.None of the mentioned


Question:
Top layer is

1.Physical media

2.Application

3.Design

4.None of the mentioned


Question:
Transmission media is

1.Acoustic

2.Guided

3.Optical

4.All of the mentioned


Question:
U-interface is the two wire interface between

1.Computing device and terminal adapter

2.Terminal adapter and exchange unit

3.Exchange unit and network terminating unit

4.Computing device and exchange unit


Question:
What are the parameters calculated for an estimator?

1.Error

2.Mean square error

3.Variance

4.All of the mentioned


Question:
Which can be used as an intermediate device in between transmitter entity and receiver entity?

1.IP router

2.Microwave router

3.Telephone switch

4.All of the mentioned


Question:
Which has higher transmission rate?

1.BPSK

2.16-QAM

3.BPSK & 16-QAM

4.None of the mentioned


Question:
Which is connection oriented and which is connection-less?

1.Datagrams, virtual circuits

2.Virtual circuits, datagrams

3.Datagrams

4.None of the mentioned


Question:
Which method is much better and efficient?

1.Vector quantization

2. Scalar quantization

3.Vector & Scalar quantization

4.None of the mentioned


Question:
Which needs more signal power?

1.BPSK

2.16-QAM

3. BPSK & 16-QAM

4.None of the mentioned


Question:
Which noise component plays a role in decision making?

1.Relevant noise

2.Non relevant noise

3.Relevant & Non relevant noise

4.None of the mentioned


Question:
Which reduces the dynamic range of quantization noise in PCM?

1.Non uniform quantizer

2.Uniform quantizer

3.Adaptive quantizer

4.None of the mentioned


Question:
Which signal sets are called as equivalent signal sets?

1.Simplex

2.Bi-orthogonal

3.Simplex & Bi-orthogonal

4.None of the mentioned


Question:
Which tells about low level transmission and framing?

1.V series

2.X series

3.G series

4. Q series


Question:
Which tells about signalling?

1.V series

2.X series

3.G series

4.Q series


Question:
Which uses TCP?

1.Simple mail transfer protocol

2.Simple network management protocol

3.Simple mail transfer & network management protocol

4.None of the mentioned


Question:
Which uses UDP?

1.Echo

2.Time

3.Domain name server

4.All of the mentioned


Question:
Window given the number of

1.Bytes

2. Frames

3.Bytes & Frames

4.None of the mentioned


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