Which of the following is a true statement?
A. A low pressure A/C cutout switch may prevent A/C compressor operation in extreme cold ambient temperatures.
B. A low pressure A/C cutout switch may prevent A/C compressor operation if there is insufficient refrigerant in the system.
C. A high pressure A/C cutout switch may prevent A/C compressor operation if the air flow through the condenser is restricted.
D. All of the above are true statements.
Answer: D
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You need to prepare to perform a First Law analysis on a device. The device is covered in insulation, and appears to have a plunger on the top which can move up and down during operation. There are also electrical wires entering and exiting the walls of the device. The device appears to be sealed. Beginning with the general equation for the First Law of Thermodynamics, develop a simplified expression that should be suitable for use with this device to calculate the overall behavior of this device for a period of time.
What will be an ideal response?
Which of the following describes the consequence of noncondensable gasses collecting in the condenser and the resulting increases in refrigerant temperature and pressure?
A) A reduction of system capacity and an increase in energy usage B) The corrosion of metals throughout the system C) A freeze-up at the expansion valve or metering device D) An increase in the efficiency of the refrigeration system
____ is the theoretically exact location of the axis or center plane of the feature.
A. Exact position B. True position C. Center position D. Specified position E. Axis position
If g (t) = 
write out and simplify
(a) g(3) (b) g(2 ? t) (c) g(t/10 + 4) (d) g(jt) (e) g(jt) + g(-jt) / 2 (f) g(jt - 3/2) g(-jt - 3) / 2