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1. List the physics principles that make heat pump operation possible.
2. Why do most heat pumps have two metering devices?
3. What keeps both metering devices from being in the refrigeration circuit at the same time?
A parallel-plate capacitor is charged by a battery, and the battery is then disconnected from the capacitor. Because the charges on the capacitor plates are opposite in sign,they attract each other. Hence, it takes positive work to increase the p..
A rotating machine, such as turbines or compressors, is vibrating and transmitting large forces to the ground. This vibration might be due to shock or unbalanced mass of the rotor.
1- Use the half-reaction method to balance the equation Ca(s) +Cl2(g) --> CaCl2(s). 2-A sample of sodium chloride, NaCl, weighing 0.0678 g is placed in a 25.0-mL volumetric flask. Enough water is added to dissolve the NaCl, and then the flask is ..
two λ/2 dipoles are placed parallel to each other and spaced by a distance d = .15 λ , they are fed with antiphase currents so that I2=-I1=.7 Ampere, i- find the power radiated by the system taking into account the mutual impedance betwen the dipol..
What is the resistance of a copper bus-bar, as used in the power distribution panel of a high-rise office building, with the dimensions indicated in given figure?
Given the following message, find the compressed data using the second version of run-length coding with the count expressed as a four-bit binary number.
Measurments taken of a square-wave signal using a frequency-selective voltmeter(called a spectrum analyzer) show its spectrum to contain adjacent components(spectral lines) at 98KHz and 126 KHz of amplitudes 63 mV and 49 mV
a) A delta-connected three-phase source has a phase voltage of 220 V. It feeds a delta-connected load consisting of three identical impedances of 10/42° O each. Find the magnitude of the phase current in the load, the line current
The signal cos(2πt) is of course periodic .What is the period ?
The load is a 5- Ω resistance. Find the current gain, voltage gain, and power gain of the amplifier. If the power supply has a voltage of 12V and supplies an average current of 2A, find the power dissipated in the amplifier and the efficiency.
Explain how these systems help Office Depot minimize costs and any other benefits they provide. Identify and describe other supply chain management applications that would be especially helpful to Office Depot.
State one commonly used device used in ultrasonic transmitters and receivers and - state the advantage of it that suits its choice.
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