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A 10-kVA, 200:400-V, single-phase transformer gave these test results:
• Open-circuit test (LV winding supplied): 200 V, 3.2 A, 450 W
• Short-circuit test (HV winding supplied): 38 V, 25 A, 600 W
Compute the efficiency when the transformer delivers half its rated kVA at 0.85 power factor lagging.
Write an essay on the replacement of metallic automobile components by polymers and composite materials. Address the following issues:
Address Search - Air Pollution and Prepare the paper on Air Pollution
Example introduced a heat exchange system revamp problem. If the plate heat exchanger E101 in Figure 2.19 is the gasketed-plate type, then the exchanger area can be increased by adding plates to the exchanger. How much additional area must be adde..
Water will flow inside the tubing, and a hydrocarbon vapor will condense on the outside of the tubing.
Calculate the average mechanical torque needed to turn the coil and generate power for the resistor. Identify the action of the device as that of a motor or a generator.
What will be the percentage increase of the radiation coefficient hr under the changed conditions?
What ratio of temperatures for the two samples would produce the same root mean square velocity?
The ammonia mixture enters the tower enters the tower at a rate of 1000 ft3/min measured as dry gas at 60 oF and 1 atm. the pressure of both streams and throughout the tower = 15 lbf /in2 g. what percentage of the ammonia entering the tower is not ..
A 50-kW, 250-V, short-shunt compound generator has the following data: Ra = 0.06 Ω, RS = 0.04 Ω, and Rf = 125 Ω. Calculate the induced armature voltage at rated load and terminal voltage. Take 2 V as the total brush-contact drop.
A nickel steel rod 8 cm outer diameterorginally at a temperature of 300 Troc is suddenly immersed in a liquid at 100oc for which the convective heat transfer co efficient is 100 w/m2 0k . what is the..
Determine the electromagnetic force on the plunger by the application of Equations (12.4.19) and (12.4.20). Interpret the significance of the sign that you obtain in the force expression.
The vessel is 4 m internal diameter and 20 m long. Estimate the minimum wall thickness required to resist this pressure, for the cylindrical section and the heads. Take the design pressure as 12 bar and the maximum allowable stress for the materia..
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