PF is P / S in general. If the transformer is running at 80.1% of full load, the PF should stay the same right since
PF = 0.801P / 0.801S
= P / S
since if the transformer is running at 80.1% full load, the output S and output P would both be 80.1% right? So basically, no matter what load...
Question basically asks to find the parameters of a transformer via an open circuit and closed circuit test. We were taught that for OCT,
V = (I * cos(theta)) * R
V = (I * sin(theta)) * X
To find the core losses. This makes sense, since we are only using the component of the current that...
In a Rankine cycle such as a steam power plant, why does the liquid (water) have be condensed before being reheated first? Isn't the Q just extracted during the condensation stage, wasted into a nearby reservoir, and then re-added in the boiler? Could this water not be fed straight to the...
Does impedance not include resistance (Z = R + X)? I'm logically thinking that the closed circuit test gets the impedance because all of the I flows back to the source, and any resulting V drop would be due to the impedance (real and imaginary) in the transformer right? How about the open...
The questions in this pre-lab are pretty basic and conceptual, and have not yet been taught in class. However, I'd like to complete this prelab early since I will be busy later on. Because it is pretty conceptual, I don't have any attempt at them except Googling around. Quick explanations or...
This is more of a concept question, so the template is not followed.
Say you're given
T(x,y,z) = xy-z
And
z = x+y
Basically, T is a function of x, y, and z while z is a function of x and y. If we substitute z into T, would T become T(x, y) or stay T(x, y, z)?
I know that a 2nd order homo ordinary differential equation's solution is in the form of
\[f(x) = {C_1}{e^{{a}t}} + {C_2}t{e^{{a}t}}\]
for repeated real roots of the characteristic equation, and that the solution for a single complex root (and its conjugate) involves a cosine. I'm curious...
But the Heaviside function merely states that it equals a constant (1) when greater than t = a and another constant (0) when less, so can't you treat it like a constant?
Oh thanks! My mistake in LaTeX for the 3rd question. I meant
\[f(t)u( - t + 1)u(t - 1)\]
so it only turns on when t < -1 and t > 1 at the same time, which is never. Then the graph would just be a constant 0 right?