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1. How are hermetic compressors cooled?
2. What types of compressors are commonly used for chillers?
3. Why do many central system chillers use water-cooled condensers?
4. What is moisture regain?
Calculate a supercritical power cycle with carbon dioxide operating at 120 bar and with 200°C maximum temperature in the cycle. Take the isentropic efficiency of the turbine 0.8.
Estimate the transition times and propagation delay for this inverter following the definition in Fig.1.35 of the Text and assuming that the switches operate instantaneously at ui = Kripa.
The load to a 3-phase supply comprises three similar coils connected in star.- Find the phase and line voltages. , the KVAR input and, resistance and reactance of each coil.
Light exerts pressure on surfaces on which if falls (radiation pressure). Will this pressure be greater on a shiny surface or a dark surface?
Determine the armature voltage drop due to the demagnetizing effect of armature reaction
"Divide by 3 clock with 50% duty cycle" is the most commonly asked ASIC design question. This solution gives a simple design in which only 1 counter is required which works only on positive edge of the clock.
Suppose we used the thumb rule that the optical line of sight distance from an antenna h meters high to the horizon,in kilometers is 4√h. what is the radius of the earth in kilometeres that would justify this approximation
Design a cascaded OP AMP circuit that will produce the output vO = 5 × 107 vS + 2.5 V. The maximum gain for an OP AMP is 10,000. The input stage must have an input resistance of 1 kΩ or greater.
what is meant by "proactive" project management. Discuss ways in which to ensure that projects are being managed proactively. Investigate on the internet the features of Microsoft Project. Discuss why a project plan is not a Microsoft Project file.
If the site is developed as a run-of-river type of plant, without storage, determine the standby capacity to be provided. Assume that overall efficiency of the plant is 80%.
Assume that the feeder shown in Figure 4.33 has the same characteristics as the one in Example 4.3, but the 500 kVA load has an increasing load density. Calculate the percent voltage drop in the main.
A full-wave SCR converter circuit is used to regulate the power across a 10Ω resistance. The voltage source is 120V (rms). At a triggering angle of 72°, compute the power across the load and the rms currents of the load.
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