A period of 100 ms in microseconds would be equals to
1.103us
2.105us
3.107us
4.109us
A sine wave is defined by
1.amplitude
2.frequency
3.Phase
4.All of the above
Data to be transmitted must be transformed into
1.Electronic signal
2.Magnetic pulses
3.Radiations
4.Electromagnetic signals
Digital signals are represented in
1.Sine Waves
2.Levels
3.Stages
4.None of the above
If a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two signal levels the maximum Bit rate would be
1.12000 bps
2.6000 bps
3.1800bps
4.zero
In induced noise, the impairment is created by sources like
1.Motor & appliances
2.Power lines
3.the sending and receiving antenna
4.Motion of electrons in wire
SNR (signal to noise ratio) is equals to
1.Avg signal power/Avg noise power
2.Avg signal power/Avg distortion
3.Avg noise power/Attenuation
4.Avg Attenuation/Avg distortion
The propagation speed of electromagnetic signals depends on the
1.medium
2.Period
3.Phase
4.delay
A digital signal is a composite analog signal with
1.finite bandwidth
2.Infinite bandwidth
3. zero bandwidth
4. None of the above
A digitized voice channel is made by digitizing a 4-kHz bandwidth analog voice signal. We need to sample the signal at twice the highest frequency (two samples per hertz). We assume that each sample requires 8 bits. What is the required bit rate?
1.64 kbps
2.32 kbps
3.128 kbps
4. 16 kbps
A transmission media can have signal impairment because of
1.Noise
2.Attenuation
3.distortion
4.All of the above
According to Fourier analysis, any composite signal is a combination of sine waves with
1.diff frequencies amplitude, and phase
2.different frequencies
3.same frequencies
4.same frequencies with amplitude and phase
Analog data refers to information that is
1.Discrete state
2.Continuous state
3.Randomly arranged
4.None of the above
Assume we need to download text documents at the rate of 100 pages per second. What is the required bit rate of the channel?
1.1.846 Mbps
2.1.536 Mbps
3.2.4 Mbps
4.None of the Mentioned
Bit length can be defined in terms of
1.high and low frequency
2.Propagation Speed
3.Bit duration
4.both b and c
Bit rate is measured in
1.Bits per Hertz
2.Bits Per Second
3.Nano seconds
4.Pixels per second
Bit Rate is the number of bits sent in
1.1sec
2.2sec
3.10sec
4.100sec
Change over a long span of time means
1.High Frequency
2.Low Frequency
3.High Phase
4.Low phase
Conversion of digital signal to analog signal is
1.Modulation
2.Demodulation
3.Encapsulation
4.Bypass
Digital data refers to the information that is
1.Continuous
2.Discrete
3.Bits
4.Bytes
Frequency is expressed in
1.Second
2.Nanosecond
3.Hertz
4.Megahertz
Given the frequency 24Hz the corresponding period would be c. d.
1.87.9ms
2.41.7ms
3.90ms
4.12ms
How many factors data rate limit depends on
1.one
2.two
3.four
4.three
If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz, what is its bandwidth?
1.2500 Hz
2.900 Hz
3.800 Hz
4.can’t be determined with the information given
If signal does not change at all, its frequency is
1.Zero
2.Maximum
3.Infinite
4.None of the above
In baseband transmission, the required bit rate is proportional to the
1.Wavelength
2.frequency
3.Period
4.Bandwidth
In data communications, the non periodic signals
1.Sine wave
2.Digital Signals
3.Analog Signals
4.None of the above
In data communications, we use periodic analog signals and
1.Periodic digital signals
2.Non periodic analog signals
3.Non periodic digital signals
4.both a and c
In real life, we cannot have a
1.Noisy Channel
2.Noiseless channel
3.Bandwidth of channel
4.Frequency of channel
One Picoseconds (PS) is equivalent to
1.10-3 s
2.10-6 s
3.10-9 s
4.10-12 s
Periodic analog signals can be classified as
1.Simple analog signal
2.Composite analog signal
3.Multiple Sine waves
4.All of the above
Signal to Noise Ratio is the ratio of the two
1.Signals
2.Powers
3.Noise
4.Frequencies
Sine wave can be represented by three parameters
1.peak amplitude, frequency and bandwidth
2. Frequency, phase and bandwidth
3.Peak amplitude, frequency and Phase
4.Peak amplitude, bandwidth, Period
SNR stands for
1.Shannon Noise ratio
2.Shannon Noise Relation
3.Signal Noise ratio
4.Signal Noise Relation
The bandwidth of a composite signal is the difference between the highest and
1.zero frequency
2.lowest frequencies
3.two Parallel frequencies
4.None of the above
The data rate depends upon
1.Bandwidth
2.Level of signals
3.Level of noise
4.All of the above
The difference in the delay of the signal may create a difference in
1.Phase
2.Frequency
3.Period
4.Decibel
The power in our house can be represented by
1.sine wave with a peak amplitude
2.sine wave with amplitude
3.sine wave with phase
4.sine wave with frequency
The range of frequencies a channel can pass is called bandwidth in
1.Bits per second
2.Hertz
3.Kilogram
4.Nanosecond
The range of frequencies contained in a composite signal is its
1.Wavelength
2.Bandwidth
3.amplitude
4.Composite
The relationship between amplitude and frequency can be represented by
1.frequency-domain plot.
2.Time-domain plot
3. Phase Domain Plot
4. Amplitude domain Plot
The term that describes the position of the waveform relative to time 0 is
1.Wavelength
2.Period
3.Frequency
4.Phase
The term that refers to loss of strength of a signal is called
1.attenuation
2.distortion
3.Noise
4.Impairments
The time required for a bit to travel from source to destination is
1.Latency
2.Propagation Time
3.Delay
4.Transmission time
The transmission impairment that refers to a signal with high energy in a very short time is
1.Thermal Noise
2.Induced Noise
3.Cross talk
4.Impulse Noise
The unit that is used to express the state of a signal is
1.Kilograms
2.Seconds
3.Decibel
4.Hertz
The value of the decibel is positive, if signal is
1.Attenuated
2.Distorted
3.Noisy
4.Amplified
We cannot send the digital signal directly to the channel, when the channel is
1.bandpass
2.Bypass
3.baseband
4.Low pass
We send a voice signal from a microphone to a recorder, the transmission is
1.Base band transmission
2.Broad band transmission
3.both a and b
4.None of the above
When there is heavy traffic on the network, the queuing time is
1.fluctuate
2.Remains same
3.increases
4.decreases