The majority of problems with residential air-conditioning systems are due to:
A) Electrical problems. B) Customer problems.
C) Mechanical problems. D) Refrigeration problems.
A
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A frictionless piston maintains a co.1nstant pressure of 150 kPa on the steam in a vertical cylinder. The temperature is reduced from 200ºC until it reaches 60ºC. The work done by the piston on the steam is nearest:
A) 161 kJ/kg B) 188 kJ/kg C) 212 kJ/kg D) 244 kJ/kg
Answer the following statements true (T) or false (F)
1. A prescriptive code needs no standards. 2. Roof live load is a function of the building's occupancy. 3. An average tornado strikes a larger area on the ground than a hurricane. 4. For wind blowing along one of the two major axes of a rectangular building, the windward wall is subjected to positive (toward-the-wall) pressure.
Technician A says that freewheeling engines are not in danger of valve damage due to a broken timing component. Technician B says that balance shafts do not need to be timed to the crankshaft. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
What new type of social division became increasingly significant between the world wars?
a. racial divisions b. gender divisions c. class divisions d. generational divisions