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1. List the three ways that evaporator temperature can be controlled.
2. What type of system would be used when the refrigeration load varies over a wide range, such as in a supermarket?
3. Explain a method used on walk-in coolers and freezers to help prevent warm air from entering the case when the door is opened.
A 1000 kg battery powered adiabatic electric vehicle has a fully charged battery containing 20.0 MJ of stored energy. If it requires 12.0 kW of power to keep it moving at a constant velocity on a horizontal road
what is the range of numbers that can the represented by a 4-bit two's complement representation A 5-bit representation A 16 -bit representation
Assume that an NMOS address decoder can source 250 μA when the output goes high. - Determine the rise time of the address line voltage if VI H = 2.7 V.
An hydro-electric station has a turbine of efficiency 86% and a generator of efficiency 92%. The effecitive head of water is 150 m. Calculate the volume of water used when delivering a load of 40 MWfor 6 hours. Water weighs /000 kglm3.
a.) find the fourier coefficients of the exponential form b.) find the fourier coefficients of the combined trigonometric form c.) plot both the single sided and double sided amplitude and phase spectra
Find the maximum operating range if the required minimum SNR at the output of the receiver is 10 dB, and a link margin of 30 dB is required to account for propagation into vehicles, buildings, and urban areas
Point charges, each of value √(4πε0)C, are located at the vertices of an n-sided regular polygon circumscribed by a circle of radius a. Find the electric force on each charge for (a) n=3, (b) n=4, (c) & n=6.
Two inductors with two separate cores are used in parallel in a circuit to share the current. A customer request a design improve by putting the two windings on to the same core. 1. Draw the two windings and resulting magnetic field; 2. If 10 turns..
Using a slotted line, the voltage on a lossless transmission line was found to have a maximum magnitude of 1.5 V and a minimum magnitude of 0.6 V. Find the magnitude of the load's reflection coefficient 'Omega'.
A capacitor in an RC circuit with R = 5.00 W and C = 6.00 mF is being charged. What is the time required for the capacitor voltage to reach 86.5 percent of its steady-state value
A resistance strain guage with a guage factor sigma/3 is lastened to a steel member subjected to a stress of 100 N/mm2 . the modulus of elesticity of steel is approximately 2*105 N/mm2 . the percentage change in resistance
Two cards are drawn at random from a single well-shuffled deck of playing cards. What is the probability of drawing the ace of spades followed by the jack of hearts. What is the probability of drawing an ace and a jack (in either order).
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