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A 5-MVA, 66:13.2 kV, three-phase transformer supplies a three-phase resistive load of 4500 kW at 13.2 kV. What is the load resistance in ohms as measured from line to neutral on the high-voltage side of the transformer, if it is:
(a) Connected in Y-Y?
(b) Reconnected in Y-?, with the same high tension voltage supplied and the same load resistors connected?
Rebecca believed that Stogy would be able to hire experienced cigar rollers whose output would be somewhere around 200 cigars a day, depending on the cigar's size and shape as well as on the roller's skill.
Gas oil at 200 °C is to be cooled to 40 °C. The oil flow rate is 22,500 kg/h. Cooling water is available at 30 °C and the temperature rise is to be limited to 20 °C. The pressure drop allowance for each stream is 100 kN/m2 . Design a suitable exch..
Calculate the volume of lithium hydroxide at 0.12 M. required to neutralize 25 mL of sulphuric acid at 2.5 M. 3 marks 2. A sample of 2.5 g of solid NaOH will neutralize 125 mL of sulphuric acid. Calculate the molarity of the sulphuric acid. 3 mark..
Need to make 250 ml of a 0.100 M solution of aluminum from a 5M stock of aluminum nitrate. What do you do?
A 1-liter container of nitrogen gas (N2) at a temperature of 23c is intially at a pressure of 1.25 atm. because of a slow leak the pressure falls to 1.15 atm 1 hour later what is the leak rate in molecules/second?
An analyst gathered the following information about the return distributions for two portfolios during the same time period:
The helicopter can produce a maximum downward air speed ( v = 24 m/s ) in a slipstream of a diameter ( D = 9 m). Knowing that the weight of the helicopter and the crew is ( 15 kN ) and assuming air density rho = 1.21 kg/m^3 ), determine the maximu..
a solution containing 30 wt. benzene b 45 wt. toluene t and 25 wt. xylene x is fed into a distillation process as
This is a fluid dynamics experiment involving the filling and emptying of tanks. The objectives of the experiment include: Determination of the discharge coefficient of the orifice and the equivalent length of a pipe mounted at the outlet of the two..
Consider the solution of Example 11.4.1. By means of a phasor diagram, determine the load power factor for which the regulation is maximum (i.e., the poorest), and find the corresponding regulation.
A vapor rate of 2500 kg/h is required and the vaporizer will operate at 6 bara. Size the vessel to restrict the carryover of liquid droplets. The liquid hold-up time need not be considered, as the liquid level will be a function of the thermal des..
A scheme for concurrently heating separate water and air streams involves passing them through and over an array of tubes, respectively, while the tube wall is heated electrically. To enhance gas-side heat transfer, annular fins of rectangular pro..
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