Generator manufacturers often use the term WR2, which is the weight in pounds of all the rotating parts of a generating unit (including the prime mover) multiplied by the square of the radius of gyration in feet. WR2/32 2 is then the total moment of inertia of the rotating parts in slug-fl2. (a) Determine a formula for the stored kinetic energy in ft-lb of a generating unit in terms of WR2 and rotor angular velocity wm (b) Show that 2.31 x 10 'WR’(rpm)² H = per unit-seconds: Saed where Srated is the voltampere rating of the generator, and rpm is the synchronous speed in r/min. Note that 1 ft-lb = 748/550 = 1.356 joules. (c) Evaluate H for a three-phase generating unit rated 800 MVA, 3600 r/min, with WR2 = 4,000,000 lb-ft2.

Q: What are some applications of E = mc2

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Q: Assume each diode to be OFF when V₂ ≤ 0.7V and ON when VĎ >0.7V. Find iD1, İD2, İD³, and vō in each…

A: Given:a circuit,when , the diode is off. when , the diode is on. Find:iD1, iD2, iD3 and v0.

Q: Could you show how to do the second part as well?

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Q: A proton is heavier than an electron by ------ times.

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Q: is one of the best circuits to interface an analog input and digital circuit

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Q: Ic=? VCE = ? 180 kr 20V. {.5KQ 5km Ic UCE B = 100

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Q: = Ic = ? VCE = ? 180 k 20V. 5.5ΚΩ Ic CE 1-24 B = 100

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.