Natural ventilation can be provided in a building ________________________
A. through open windows that allow air to move across the floor
B. via a stack effect which relies on the fact that warm air will rise and pull in outside air to replace the amount of air removed
C. by heating the return air and cooling the supply air
D. Both A and B
D
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An ideal gas initially at 300 K and 1 bar undergoes a three-step mechanically reversible cycle in a closed system. In step 12, pressure increases isothermally to 5 bar; in step 23, pressure increases at constant volume; and in step 31, the gas returns adiabatically to its initial state. Take CP = (7/2)R and CV = (5/2)R.
(a) Sketch the cycle on a PV diagram. (b) Determine (where unknown) V, T, and P for states 1, 2, and 3. (c) Calculate Q, W, ?U, and ?H for each step of the cycle.
What do modern hydronic systems use to circulate the hot water?
A) Pumps B) Fans C) Gravity D) Convection
Once cattle are identified as Bos indicus or Bos taurus they can be categorized as:
A. British breeds B. continental breeds C. composite breeds D. all answers are correct
What name is often given to a stand-alone repeater device?
A. wireless distributor B. wireless controller C. Wi-Fi router D. Wi-Fi signal booster