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A single-phase 240/120 V transformer has the following parameters:
R1 = 1-ohm; R2= 0.5 -ohm; X1 =6 -ohm; X2 = 2 -ohm; R0 = 500 -ohm; X0 = 1.5k -ohm.
A load of 10 -ohm at 0.8 power factor lagging is connected across the low-voltage terminals of the transformer. The voltage measured across the load side is 110V. Compute the following:
(a) Load voltage referred to the primary side
(b) Currents of the primary and secondary windings
(c) Source voltage
(d) Voltage regulation
(e) Load power
(f) Efficiency of the transformer
If it takes 1 sec to rotate 45 degrees after starting from rest, how long in seconds would it take to instead rotate 81 degrees after starting from rest under the same constant angular acceleration.
A particular diode was measured to have VD = 0.62 V at ID = 5.895 mA. Determine the following: a) the reverse saturation current IS. b) VD for a forward current of 100 mA. Assume VT = 25 mV.
two fair dice are tossed until 3 is hit (i.e., the total number of dots is 3) Determine the average (i.e., expected) number of tosses required to hit a sum of 3
A 50 hp, 460 V, three phase induction motor draws 61 amps when operating at rated voltage and at a power factor of 0.85 lagging when supplying a rated load. knowns: 1hp=746watts effeciency (n) = Pout/Pin = Pout/(Pout+losses)
A Y-connected load with an impedance of 12 - j15 per phase is connected to a balanced Delta-connected 208-V, 60-Hz, three-phase, positive phase-sequence supply. Determine (a) the line and phase voltages
The parking lot of the Spenditall Megamall has an area of 128 ac. It is partially landscaped to provide some areas of grass. Assume that an average of 63% of the water that falls on the parking lot will flow
For much of the last century, the annual growth rate of energy utilization in the world was 3.5% per year. At present, the rate of global energy usage is approximately 15 TW. When considering only coal, oil, and gas.
Let us assume that a synchronouse 3 phase alternator produces a no-load line voltage of 13.2 KV. if a load having a lagging power factor of 0.8 is connected to the machine, must the excitation be increased or decreased
Fourier transform X(w)=Xreal(w)+j(Xi(w)). Determine and represent the signal y(w) that gives the fourier transform of Y(w)=Xi(w)+Xreal(w)e^exp(j2w).
Write a control algoirthm for a temperature control loop for a heat echanger (steam to hot water) employing a temperature control valve, controller, and thermostat. In your algorithm include a step change and ramp change.
(d) Use the colon operator to create a matrix D by extracting the first through third columns of matrix A. (e) Create a matrix F by extracting the values in columns 2, 3, and 4 and combining them into a single column matrix. (f) Create a matrix G tha..
A box contains a shipment of N (N>4) computer chips, of which four are defective. Four chips are randomly selected and examined as to wether or not the chips are defective. Describe the sample space for this experiment.
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