laboursonline – MCQs, Mock Tests | Electrical measurements Digital Communications MCQs set-16

Channel noise is

1. Additive
2. White and stationary
3. Has infinite bandwidth
4. All of the mentioned

✅ Correct Answer: 4

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

✅ Correct Answer: 1

Decision making needs

1. Priors
2. Likelihoods
3. Priors & Likelihoods
4. None of the mentioned

✅ Correct Answer: 3

In matched filter _______ is performed.

1. Convolution
2. Correlation
3. Convolution & Correlation
4. None of the mentioned

✅ Correct Answer: 3

Which needs more signal power?

1. BPSK
2. 16-QAM
3. BPSK & 16-QAM
4. None of the mentioned

✅ Correct Answer: 2

Which has higher transmission rate?

1. BPSK
2. 16-QAM
3. BPSK & 16-QAM
4. None of the mentioned

✅ Correct Answer: 2

Symbol error probability can also be determined using upper bound.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Which signal sets are called as equivalent signal sets?

1. Simplex
2. Bi-orthogonal
3. Simplex & Bi-orthogonal
4. None of the mentioned

✅ Correct Answer: 3

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

✅ Correct Answer: 3

What are the parameters calculated for an estimator?

1. Error
2. Mean square error
3. Variance
4. All of the mentioned

✅ Correct Answer: 4

Top layer is

1. Physical media
2. Application
3. Design
4. None of the mentioned

✅ Correct Answer: 2

Entities also does

1. Error correction
2. A/D
3. D/A
4. All of the mentioned

✅ Correct Answer: 4

In channel, delay is

1. Fixed
2. Variable
3. Fixed & Variable
4. None of the mentioned

✅ Correct Answer: 3

Channel can provide connectivity to

1. Point to point
2. 1 to many
3. Many to many
4. All of the mentioned

✅ Correct Answer: 4

Embedding is a form of

1. Abstraction
2. Layering
3. Entity sharing
4. None of the mentioned

✅ Correct Answer: 2

Transmission media is

1. Acoustic
2. Guided
3. Optical
4. All of the mentioned

✅ Correct Answer: 4

In transmission media, the symbol type is generally

1. Analog
2. Digital
3. Analog & Digital
4. None of the mentioned

✅ Correct Answer: 1

Noise is _____ in nature.

1. Random
2. Systematic
3. Random or Systematic
4. None of the mentioned

✅ Correct Answer: 3

The radiation loss increases as

1. Frequency increases
2. Frequency decreases
3. Does not depend on frequency
4. None of the mentioned

✅ Correct Answer: 1

Attenuation is a function of

1. Channel length
2. Transmission media
3. Signal frequencies
4. All of the mentioned

✅ Correct Answer: 4

The time required to transmit frame depends on

1. Frame size
2. Channel capacity
3. Frame size & Channel capacity
4. None of the mentioned

✅ Correct Answer: 3

Window given the number of

1. Bytes
2. Frames
3. Bytes & Frames
4. None of the mentioned

✅ Correct Answer: 3

Routing is performed only centrally.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Which is connection oriented and which is connection-less?

1. Datagrams, virtual circuits
2. Virtual circuits, datagrams
3. Datagrams
4. None of the mentioned

✅ Correct Answer: 2

Which uses UDP?

1. Echo
2. Time
3. Domain name server
4. All of the mentioned

✅ Correct Answer: 4

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

✅ Correct Answer: 1

Which tells about low level transmission and framing?

1. V series
2. X series
3. G series
4. Q series

✅ Correct Answer: 3

Which tells about signalling?

1. V series
2. X series
3. G series
4. Q series

✅ Correct Answer: 4

Which method is much better and efficient?

1. Vector quantization
2. Scalar quantization
3. Vector & Scalar quantization
4. None of the mentioned

✅ Correct Answer: 1

Analog source coding method are

1. Temporal waveform coding
2. Spectral waveform coding
3. Model based coding
4. All of the mentioned

✅ Correct Answer: 4

The source output in PCM and DPCM is quasi stationary.

1. True
2. False
3.
4.

✅ Correct Answer: 2

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

✅ Correct Answer: 3

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

✅ Correct Answer: 3

Binomial distribution deals with

1. Continuous random variable
2. Discrete random variable
3. Continuous & Discrete random variable
4. None of the mentioned

✅ Correct Answer: 2

In poisson distribution mean is ______ variance.

1. Greater than
2. Lesser than
3. Equal to
4. Does not depend on

✅ Correct Answer: 3

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

✅ Correct Answer: 3

Stochastic processes are

1. Strict sense stationary process
2. Wide sense stationary process
3. All of the mentioned
4. None of the mentioned

✅ Correct Answer: 2

Gaussian process is a

1. Wide sense stationary process
2. Strict sense stationary process
3. All of the mentioned
4. None of the mentioned

✅ Correct Answer: 3

ISDN integrates speech and data on

1. Different lines
2. Same lines
3. Different & Same lines
4. None of the mentioned

✅ Correct Answer: 2

ISDN is a

1. Packet switched network
2. Circuit switched telephone network
3. Packet switched & Circuit switched telephone network
4. None of the mentioned

✅ Correct Answer: 3

Circuit switched connection is provided for

1. Voice
2. Data
3. Voice & Data
4. None of the mentioned

✅ Correct Answer: 3

Packet switched connection is provided for

1. Voice
2. Data
3. Voice & Data
4. None of the mentioned

✅ Correct Answer: 2

Channel bonding provides

1. Higher data rate
2. Lower data rate
3. Does not affect data rate
4. None of the mentioned

✅ Correct Answer: 1

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

✅ Correct Answer: 3

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

✅ Correct Answer: 1

S-interface is a _______ bus.

1. Two wire bus
2. Four wire bus
3. Single wired bus
4. None of the mentioned

✅ Correct Answer: 2

The services provided by ISDN

1. Bearer service
2. Teleservice
3. Secondary service
4. All of the mentioned

✅ Correct Answer: 4

Attributes of ISDN have

1. Definition
2. Allowable values
3. Definition & Allowable values
4. None of the mentioned

✅ Correct Answer: 3

In layering, n layers provide service to

1. n layer
2. n-1 layer
3. n+1 layer
4. none of the mentioned

✅ Correct Answer: 3

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

✅ Correct Answer: 4