The first step in selecting commercial refrigeration equipment for a new installation is:
A) Compile a list of components already in inventory so that you can see what you will have to choose from.
B) Perform a heat load calculation to determine the required BTU capacity of the system.
C) Compile a list of component prices in order to determine how large a system you can afford.
D) Select the compressor because all other components will be sized to match it.
B
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Which of the following is a common hazardous material on a steel-erection job site?
a. Acetylene b. Graphite c. Asbestos d. Formaldehyde
?The temperature of an arc can range between5500°F (3000°C) to above 36,000°F (20,000°C) but most SMAW temperatures are around __________.
A. ?4500°F (2500°C) B. ?3200°F (18000°C) C. ?1100°F (6100°C) D. ?6000°F (3300°C)
The "don't be a tattle-tale" attitude is only one of the problems that works against whistle-blowing. Retribution is when:
A. People tend to choose sides which leads to damaged relationships. B. People find that their time, energy, and attention are overtaken by the events surrounding the claim of illegal or unethical behavior. C. People may be fired, transferred to an undesirable location, or reassigned to an undesirable job. D. None of the above
A continuous-time signal x (t) is described by x (t) = 4 cos(2?t) sin (20?t). If x (t) is filtered by a unity-gain ideal lowpass filter with a bandwidth of 10 Hz the response is a sinusoid. What are the amplitude and frequency of that sinusoid?
What will be an ideal response?