The type of fan or blower with a blade design that is self-cleaning and a good choice for air containing a lot
of dust or grease is the _____.
a. forward-curved centrifugal
b. radial
c. backward-inclined centrifugal
d. ducted fan
b
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In a bypass lubrication system, the oil flows from the pump, _____.
a. through the filter, then through the bearings b. part to the bearings, and part through the filter c. part to the bearings, and part back to the sump d. part to the bearings, and part bypasses the filter through its relief valve
A rigid vessel initially contains saturated steam at P = 0.2 MPa. Heat is added until the pressure is 0.3 MPa. Determine the amount of heat added per kilogram of steam, and the change in specific entropy of the gas.
A. 3963 kJ/kg and 0.5751 kJ/kg•K B. 277 kJ/kg and 0.5751 kJ/kg•K C. 287 kJ/kg and 0.5971 kJ/kg•K D. 14.1 kJ/kg and 0.5971 kJ/kg•K E. Insufficient information to solve
The development of Spanish influence in California in the mid-1760s and 1770s was facilitated by
A. the Black Legend. B. the establishment by Father Junipero Serra of a chain of Spanish missions starting in San Diego and up the California coast to Sonoma. C. existing permanent settlements of Native Americans in California. D. the lack of interest by Christian missionaries to Christianize Native Americans in California. E. the highly successful exploration of California by Spanish explorer Juan Rodriguez Cabrillo.
Why are positive shutoff devices used when removing gauge manifold sets from Schrader valves?
A) To reduce the release of refrigerants B) To prevent postremoval refrigerant venting C) To automatically loosen Schrader valves D) To restart the system for installation