0
Add your answer:
Earn +20 pts
Can you say whether a signal is periodic or nonperiodic by looking at its frequency domain plot?
Yes. The Fourier transform of a signal to the frequency domain will give rise to a graph that has energy (is greater than zero) at only the base frequency and its harmonics.
What is the greatest common multiple of 2 and 9?
In any list that includes zero, the answer is zero.
What numbers are between -34 and 58?
That's an infinite list. Zero is on it.
What are the five multiples of 11 that are greater than zero?
They are infinite. The first five are: 11, 22, 33, 44, 55.
What does bias mean in a valve--tube-- radio receiver circuit?
Like many electronic devices, tubes (aka valves) are closer to linear in certain operating ranges--meaning the output is a scaled version of the input when operating in the linear region. However, these linear regions are not typically at zero volts. So a DC bias is added to the AC input signal, shifting the signal into the linear region of the device. The DC bias can be removed from the output, leaving the amplified signal. Essentially the bias shifts the "zero" point for the signal to match the amplifier characteristics. Choosing bias is an important consideration in amplifier design. Amplifiers are designated by a "class" according to their bias--class A, class B, class AB, class C (there are other classes but they aren't used with tubes). Because the bias signal is the zero signal input, the bias determines how much power the tube uses when idle. For example, a class A amplifier is biased to the middle of the tube operating range so it uses about 50% power when idle, which is wasteful and makes a lot of heat.
What is power signal and what is energy signal?
Those signals which have finite energy and zero power known as energy signal..Those signals which have infinite energy and finite power known as power signal..
Why do you use energy signal in real life although power of the energy signal is zero?
see p=E/t whr E is energy of a sig and t is time, if p iz zero it means t=0 and energy iz infinite means we can use max energy of a signal to travel it long distance,,,,,and it is possible only when power iz zero........
Why any signal with finite energy will have zero power?
in energy signal power iz zero according to this equation P=E/2T
Unit step signal is energy or power signal?
The unit step signal is a Power signal. Since when we find the power it comes to 1/2 (i.e finite value). And when we find its energy, we got INFINITY. If a signal has energy as infinity and power as a finite non-zero value, then it is a power signal, not an energy signal.
Differences between energy and power signals?
Energy signals have finite energy over time, meaning that the total energy is finite. Power signals have finite power over time, meaning that the average power is finite. Energy signals have zero power; power signals have infinite energy.
Why random signals are called power signals?
Energy signals are finite duration. That means if a random signal is energy type, all its realizations or its sample functions must be zero at infinity. So its expected value or mean is zero at infinity. On the other hand, a stationary process has a time invariant mean. So if its expected value is zero in infinity, it will be zero in any time. In summary if a stationary random signal is energy, its expected value must be zero every time. But It is not correct for all signals. So it is not energy type.
What is power of plane glass sheet?
it is zero . Power = 1/focal length The focal length of a plane glass or mirror is infinite, therfore power is zero
What does not have energy?
Any object that is at "level zero" has zero potential energy. In the case of gravitational potential energy, this level is sometimes defined to be ground level, sometimes (in Astronomy) at an infinite distance (in this case, any object that is closer than infinity has a negative potential energy).Any object that is at "level zero" has zero potential energy. In the case of gravitational potential energy, this level is sometimes defined to be ground level, sometimes (in Astronomy) at an infinite distance (in this case, any object that is closer than infinity has a negative potential energy).Any object that is at "level zero" has zero potential energy. In the case of gravitational potential energy, this level is sometimes defined to be ground level, sometimes (in Astronomy) at an infinite distance (in this case, any object that is closer than infinity has a negative potential energy).Any object that is at "level zero" has zero potential energy. In the case of gravitational potential energy, this level is sometimes defined to be ground level, sometimes (in Astronomy) at an infinite distance (in this case, any object that is closer than infinity has a negative potential energy).
How the energy of an electron at infinity can be zero?
That's just the way it is defined. When talking about potential energy, what matters is differences in energy levels; any energy level can be arbitrarily defined as zero. However, it makes calculations simpler if you define the potential energy at an infinite distance as zero.
What is the conductivity of superconductor?
Superconductors have zero electrical resistance, which means they have infinite conductivity. This allows them to conduct electricity without any loss of energy.
Can specific heat of a substance be infinite?
No. The first law of thermodynamics implies that the energy of the universe is finite. As a consequence the specific heat of a substance - defined as H/m where H is enthalpy and m is mass. Either H would have to be infinite or m would have to be zero. If m is zero, then the ratio is meaningless because you don't have anything to assign the enthalpy to. H = U+PV. For H to be infinite either U (internal energy) has to be infinite - but we've already established that the 1st law says total energy of the universe is finite, so that's not the case - or PV is infinite. You aren't going to get P (pressure) to be infinite so V would have to be infinite, i.e. zero density - again, if density is zero, there is effectively nothing there. Since we've eliminated all possibilities for any of the necessary terms to be infinite, specific heat cannot be infinite.
What does not have potential energy?
Items or objects that are at rest or are not positioned in a way that requires them to do work do not have potential energy. These could include stationary objects like a book sitting on a table or a rock on the ground.
