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Those who have read Chapter 7 on synchronous and reluctance machines may wonder if Park's transformation can be used in the case of the variable-reluctance stepper motor to transform the stator circuits to fictitious circuits with constant inductances fixed in the rotor. The answer is no, and the reason is that mutual inductances must exist between stator phases as given by (7.9-6). To show this, take a two-pole,
Explain what is meant by an overall heat transfer coefficient and explain what is mean by failing and what its effect will be on the value of the overall heat transfer coefficient.
a vapor compression refrigeration cycle operates at a steady state with refrigerant 134a as the working fluid.
If the price of electricity is $0.08/kWh, determine the amount of energy and money that will be saved as a result of installing motion sensors. Also, determine the simple payback period if the purchase price of the sensor is $32 and it takes 1 hou..
steam enters a well-insulated nozzle at 300lbfin2 600 degrees f with a velocity of 100 fts and exits at 40 lbfin2 with
the friction force acting at the chip-tool interface the main (tengential ) cutting force is 1500N . Find the orthogonal rake angle of the cutting tool?
A current of 10 A rms flows when a single-phase circuit is placed across a 220-V rms source. The current lags the voltage by 60?. Find the power dissipated by the circuit and the power factor.
find a cylindrical container that is large enough that it takes at least one minute to drain you may have to create an
solution the slider a has a mass of 2kg and moves in a slot in a vertical sliding plate. i what horizontal acceleration
two large well-insulated tanks of 2m diameter and 5m in height are filled with air. one tank is initially at 1bar and
A robot arm carrying a 2.75-lb package is moving in a horizontal circle at 4 miles/hr. The arm is gradually shortened for the first 0.11 s of its motion, changing the radius of the circle. The maximum acceleration the package can withstand without da..
you are manufacturing a frame for a vehicle out of some aluminum alloy 6061-t451 tubing. the frame is to be welded
Compare the ideal COP of R-134a and R-22 at an evaporating temperature of 40 F and 20 F superheat and condensing temperature of 120 F with 15 F sub cooling with the actual compressor COPs calculated from the manufacturer's performance tables.
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