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1. Why do commercial refrigeration systems need a defrost system?
2. List the ways an evaporator can be defrosted.
3. What are the three methods by which a defrost cycle can be terminated?
4. List some of the loads that must be considered when sizing the BTU requirements of a walk-in cooler or freezer.
We will weigh objects by a strain gauge or R = 120 Ohms, GF= 2.02 mounted on copper column of 6-in. diameter. Find the change in resistance per pound placed on the column. Is this change an increase or decrease in resistance
A doorbell is connected to a transformer whose primary contains 3000 turns and which is connected to 120 VAC. If the doorbell requirs 0.2 A at 10 V, find the number of turns necessary for the secondary winding and the current that flows in the pri..
Four equal point charges Q form a square of side length a. Calculate the assembly energy for this configuration.
The heavy-duty rechargeable battery you selected can provide a continuous 9A of current at 12 V for a 4-hour period of operation each night before being completely drained.
You want to design a LUT toimplement an adder. The adder takes as input two 2-bit numbers. (a) What is the minimum size ROM that will be required. (b) What data is stored in each memory location in this ROM
an ac generator with a frequency of 150hz and an rms voltage of 22.5v is connected in series with a 15.0 kilo ohms
MSP430 is connected to a pressure sensor. The sensor output is between 0.5V and 1.75V. (a) How do you configure the MSP430's ADC12 to perform analog-todigital conversion with maximal resolution. Write your C code.
A 0.88-µm communication system transmits data over a 10-km single-mode fiber by using 10-ns (FWHM) pulses. Determine the maximum bit rate if the LED has a spectral FWHM of 30 nm. Use D = -80 ps/(km-nm).
Stock Z is a growth stock that will increase its dividend by 20 percent for the next two years and then maintain a constant 12 percent growth rate there after. What is the dividend yield for each of these four stocks?
A wave in free space has a wavelength of 12 cm. This wave reaches a material in which the transmitted wave has a wavelength of 8 cm. lEl= 10V/m and lHl= 100 mA/m. Find the frequency of the wave, along with the permitivity and permeability of the m..
A series motor is now constructed from this machine by leaving the shunt field out entirely. Derive the torque-speed characteristic of the resulting motor.
Compute the equilibrium carrier concentrations and the position of the Fermi level with respect to the conduction band edge for a uniformly doped Si region with N_D=1*10^16 cm^-3 and N_A = 1*10^17 cm^-3 at room temperature.
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