A technician takes the following readings while checking the operation of an electric furnace with two heat strips: 220 V, 36 A, 70°F return air temperature, and 120°F supply air temperature. What is the airflow through the furnace?
A) = = 540 CFM B) = = 158 CFM
C) (120 — 70 ) × 1.08 × 10 = 540 CFM D) = = 500 CFM
D
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An automobile insurance company divides customers into three categories, good risks, medium risks, and poor risks. Assume that 70% of the customers are good risks, 20% are medium risks, and 10% are poor risks. Assume that during the course of a year, a good risk customer has probability 0.005 of filing an accident claim, a medium risk customer has probability 0.01, and a poor risk customer has probability 0.025. A customer is chosen at random.
a. What is the probability that the customer is a good risk and has filed a claim? b. What is the probability that the customer has filed a claim? c. Given that the customer has filed a claim, what is the probability that the customer is a good risk?
What is the primary function of a thermostatic expansion valve (TEV)?
a. To maintain the required superheat. b. To prevent floodback to the compressor. c. To prevent evaporator starving and compressor motor overheating.
The minute proliferations of the small intestinal lining that provide a large surface area
for absorption of nutrients are termed: A. papillae B. villi C. cecae
Technician A says that a diesel engine uses the heat of compression to ignite the diesel fuel. Technician B says that direct injection (DI) uses a pre-combustion chamber. Who is right?
A) A only B) B only C) Both A and B D) Neither A nor B