In MPSK adding new signals _______ make it vulnerable to noise and in MFSK _______ make it vulnerable.
1.Does, does not
2.Does not, does
3.Does, does
4.Does not, does not
According to reciprocity theorem, _____ and _____ are identical.
1.Transmitting power and receiving power
2.Transmitting gain and receiving gain
3.Effective area and physical area
4.None of the mentioned
AM-to-AM conversion brings about
1.Amplitude variation
2.Phase variation
3. Frequency variation
4.None of the mentioned
AM-to-PM conversion brings about
1.Amplitude variation
2. Phase variation
3.Frequency variation
4.None of the mentioned
Antenna gain ______ as effective area increases.
1.Increases
2.Decreases
3.Remains same
4.None of the mentionedv
Antenna’s efficiency is given by the ratio of
1.Effective aperture to physical aperture
2.Physical aperture to effective aperture
3.Signal power to noise power
4.Losses
Antennas are used
1.As transducer
2.To focus
3.As transducer & To focus
4.None of the mentioned
Antipodal signals are
1.Mirror images
2.1800 apart
3.One is negative of the other
4.All of the mentioned
As limit of k increases, the ratio of PB/PE becomes
1.1:2
2.2:1
3.1:3
4.3:1
Atmospheric window region is used for
1.Satellite communication
2.Deep-space communication
3.Satellite & Deep-space communication
4.None of the mentioned
Automatic repeat request is also called as
1.Forward error correction
2.Backward error correction
3.Forward & Backward error correction
4.None of the mentioned
Channel coding relates to area such as
1.Waveform coding
2.Structured sequence
3.Waveform coding & Structured sequence
4.None of the mentioned
Check-sum scheme has
1.Check bits
2.Parity bits
3.Longitudinal redundancy bits
4.All of the mentioned
Effective radiated power of an isotropic radiator can be given as a product of
1.Radiated power and received power
2.Effective area and physical area
3.Transmitted power and transmitting gain
4.Receiving power and receiving gain
Energy per symbol Es is given as
1.Es=Eb(log2M)
2.Es=Eb/(log2M)
3.Es=2Eb(log2M)
4.Es=Eb/2(log2M)
Error detection is realized using
1.Hash function
2.Check sum
3.Hash function & Check sum
4.None of the mentioned
Example of block code is
1.Hamming code
2.Reed-solomon code
3.Repetition code
4.All of the mentioned
Examples of structured sequences are
1.Block codes
2.Convolutional codes
3.Turbo codes
4.All of the mentioned
Field of view is ______ to antenna gain.
1.Proportional
2.Inversely proportional
3.Half the
4. Double
For FSK signalling, WT is equal to
1.0
2.1
3.0.737
4.Infinity
Hybrid automatic repeat request is a combination of
1.ARQ and error correction code
2.ARQ and error detection code
3.Error detection and correction codes
4.One of the mentioned
In analog receivers, noise bandwidth is _________ signal bandwidth.
1.Lesser than
2.Greater than
3.Equal to
4.Not related View Answer
In continuous ARQ will pullback uses _____ system.
1.Half duplex
2.Full duplex
3.Simplex
4.None of the mentioned
In orthogonal signalling with symbols containing more number of bits we need ____ power.
1.More
2.Less
3.Double
4.None of the mentioned
In which repeaters uplink is decoupled from the downlink?
1.Regenerative
2.Non regenerative
3.Regenerative & Non regenerative
4.None of the mentioned
In which system, bit stream is portioned into even and odd stream?
1.BPSK
2.MSK
3.QPSK
4.FSK
Link budget can help in predicting
1.Equipment weight and size
2.Technical risk
3.Prime power requirements
4.All of the mentioned
Link budget consists of calculation of
1.Useful signal power
2.Interfering noise power
3.Useful signal & Interfering noise power
4.None of the mentioned
M-ary signalling produces _______ error performance with orthogonal signalling and _______ error performance with multiple phase signalling.
1.Degraded, improved
2.Improved, degraded
3.Improved, improved
4.Degraded, degraded
Mechanism contributing to a reduction in efficiency is called as
1.Amplitude tapering
2.Blockage
3.Edge diffraction
4.All of the mentioned
Noise figure is a parameter that represents a ______ of the system.
1.Noisiness
2.Efficiency
3.Maximum output
4.Maximum power handling capacity
Noise figure measures the
1.Power degradation
2.Noise degradation
3.SNR degradation
4.None of the mentioned
Path loss Ls is dependent on
1.Signal power
2.Effective area
3.Wavelength
4. Antenna size
Space loss occurs due to a decrease in
1.Electric field strength
2.Efficiency
3.Phase
4.Signal power
The beam-width becomes narrower on
1.Increasing frequency
2.Increasing antenna size
3.Increasing frequency & antenna size
4.None of the mentioned
The error performance of MPSK ______ as M or k increases.
1.Increases
2.Decreases
3.Stays constant
4.None of the mentioned
The link availability measures the percentage of time the link can be ______
1.Open
2.Closed
3.Used
4.None of the mentioned
The relation between the probability of bit error and probability of symbol error in M-ary orthogonal signalling is
1.M/M-1
2.2M/M-1
3.(M/2)/M-1
4.M/M+1
The space window region ranges from
1.1GHz to 10 GHz
2.10GHz to 100GHZ
3.5GHz to 50GHz
4. 1MHz to 10MHz
The stop and wait ARQ needs _______ connection.
1.Half duplex
2.Full duplex
3.Simplex
4.None of the mentioned
Thermal noise is generated due to
1.Lossy coupling
2.Lossless coupling
3.Lossy & Lossless coupling
4.None of the mentioned
Visibility is ________ to required availability.
1.Proportional
2.Inversely proportional
3.Equal
4.Not related
What are the functions of non-regenerative repeaters?
1.Amplifies
2.Re transmits
3.Amplifies & Re transmits
4.None of the mentioned
What are the functions of satellite repeaters?
1.Re transmits
2.Regenerates
3.Reconstitutes
4.All of the mentioned
When two networks are connected in series, its composite noise figure can be given as
1.F1+(F2-1)/G1
2.F1-(F2-1)/G1
3.F2+(F1-1)/G1
4.F1G1+(F2-1)
Which factor adds phase noise to the signal?
1.Jitter
2.Phase fluctuations
3.Jitter & Phase fluctuations
4. None of the mentioned
Which is more vulnerable to noise?
1.2-ary system
2.4-ary system
3.Binary system
4.None of the mentioned
Which is the primary cost for degradation of error performance?
1.Loss in signal to noise ratio
2.Signal distortion
3.Signal distortion & Loss in signal to noise ratio
4.None of the mentioned
Which method requires less redundancy?
1.Error detection
2.Error correction
3.Error detection & correction
4.None of the mentioned
Which parameter is referred to as receiver sensitivity?
1.S/N ratio
2.G/T ratio
3.EIRP
4.PR/N0