What lubricants can be used with HFCs?
A) Polyalkylene glycol and polyol ester B) Mineral oil and alkyl benzene
C) Ethylene glycol and propylene glycol D) Polyester and rayon
A
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When using a two phase, three-wire system, why must the size of the neutral conductor be increased by the square root of 2, or 1.41?
What will be an ideal response?
The roof of a house consists of a 15-cm-thick concrete slab (k = 2?W/m•K) that is 15 m wide and 20 m long. The emissivity of the outer surface of the roof is 0.9, and the convection heat transfer coefficient on that surface is estimated to be 15?W/m2•K. The inner surface of the roof is maintained at 15°C. On a clear winter night, the ambient air is reported to be at 10°C, while the night sky temperature for radiation heat transfer is 255 K. Considering both radiation and convection heat transfer, determine the outer surface temperature and the rate of heat transfer through the roof. If the house is heated by a furnace burning natural gas with an efficiency of 85 percent, and the unit cost of natural gas is $0.60/therm (1?therm = 105,500 kJ of energy content), determine the
money lost through the roof that night during a 14-h period. What will be an ideal response?
Six volt systems require ________ wires than 12 volt systems
A) Smaller B) Equal C) Larger D) None of these
What kinds of machines use sequence control? Give at least one example.
What will be an ideal response?