1. The power of a signal is 50 mW and the power of the noise is
3 μW; what are the values of SNR and SNRdB?
&
2. Distinguish between multilevel TDM, multiple-slot TDM, and
pulse-stuffed TDM? (Min:100 Words)
A communication network has a bandwidth of 10 kHz. Calculate the
signal-to-noise ratio in dB if the capacity of the channel for a
100Kbps [2 Marks]
ii. A communications channel with a bandwidth of 4kHz has a signal
power to noise ratio of 7. Determine the Channel Capacity. [2
Marks]
ii. The bandwidth in b above is reduced by 25%. How much should the
signal power be increased to maintain the same channel
capacity?
We have to calculate the value of Power of an electric DC motor
IN WATTS made from scratch. The only known values that we have are:
The Voltage (V) which is 9V and the current (I) that we are using
which is 3 A, also the value of "n" which is n= 90.16 m (the number
of turns of the wire used in the motor)
I already asked here for this problem and someone answered
this:
Voltage = 9 V,...
energy and
power of signals.
(a) Plot
the signal x(t)
=
e−tu(t)
and determine its energy. What is the power of x(t)?
(b) How
does the energy of z(t)
=
e−∣t∣,
−∞
<
t
<
∞, compare to the energy
of z1(t)
=
e−tu(t)?
Carefully plot the two signals.
(c) Consider the
signaly(t)
=
sign[xi(t)]
=
1
xi(t)
≥
0
−1
xi(t)
< 0
for
−∞
<
t
<
∞,i
=
1,2. Find the
energy and the power of...
A normalized message signal has a bandwidth of W = 10 KHz and a
power of
Pm= 0.75 . It is required to transmit this signal via a channel
with an available bandwidth
of 80 KHz and attenuation of 50 dB. The channel noise is additive
and white
with a power-spectral density of N0/2 = 10^(-10) watts/Hz. A
frequency-modulation
scheme, with no pre-emphasis/de-emphasis filtering, has been
proposed for this
purpose.
1. If it is desirable to have an SNR of...
Calculate (in MeV) the binding energy per nucleon for 14N.
Calculate (in MeV) the binding energy per nucleon for 56Fe.
Calculate (in MeV) the binding energy per nucleon for 207Pb.
The energy of light photons varies with wavelength. Calculate
the energy per mole of photons for each of the following colors of
visible light.
Red Light, λ = 697 nm Green Light, λ = 549 nm Blue Light, λ =
403 nm
answer in kJ/mol
Consider an atom with four energy levels, where the lowest
energy is -10 eV and the highest level is 0 eV. Sketch an
energy-level diagram that could produce the spectrum. What are the
energies of the other two energy levels. (Note: there are more than
two answers.)
A -2 eV and -5 eV
B -1 eV and -4 eV
C -1 eV and -6 eV
D -6 eV and -9 eV
E -7 eV and -3 eV