What is the primary purpose of the cap on a service valve stem?
a. To prevent refrigerant from leaking out of the valve stem when back seated.
b. To keep the valve stem from being damaged.
c. To prevent dirt from getting on the valve stem and damaging the packing when opened.
d. To make the compressor look good.
c. To prevent dirt from getting on the valve stem and damaging the packing when opened.
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In practice, which of the following systems is the most likely to be modeled with the virial equation of state?
A. Benzene at STP B. Ethanol at 150 K and 101 325 Pa C. Propane at 100 Pa and 37 °C D. Carbon dioxide at 500 kPa and 50 °C E. Freon-22 at 400 K and 4 MPa
Technician A says that a keyway cut into a shaft is a potential stress raiser. Technician B says that oil holes in crankshafts are potential stress raisers. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Materials that resist decay are characterized as recalcitrant
Indicate whether the statement is true or false.
Type NM cable is often purchased in __________-foot rolls that are packaged in plastic wrapping or in cardboard boxes.
a. 100 b. 150 c. 250 d. 1000