What is the primary purpose of the low-pressure control in a heat pump?
a. Cycles compressor off on low loads
b. Prevents refrigerant floodback
c. Protects against loss of charge
d. Prevents outdoor coil icing
c
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In the accompanying figure, what is the taper angle in degrees? Round your answer to the nearest tenth of a degree.
A. 8.7 B. 8.8 C. 8.9 D. 9.0
A 10 Kw heating element, operating on rated 240 V, will have a Btu/h output of ____.
A. 29,319 B. 31,062 C. 34,130 D. 35,875
In a sample of 20 bolts, the average breaking torque was 89.7J with a standard deviation of 8.2J. Assume that the breaking torques are normally distributed.
a. Find a 99% prediction interval for the breaking torque of a single bolt. b. Find a tolerance interval for the breaking torque that includes 95% of the bolts with 99% confidence.