What is the purpose of using an outdoor ambient thermostat on a heat pump installation?
A) To cycle the heat pump based on the outside temperature instead of the inside temperature
B) To bring the heat pump on early if the temperature drops
C) To prevent the heat pump from operating in heat unless it is cold outside
D) To prevent the auxiliary heat from operating above the system balance point
D
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____-generation refers to a variety of small, modular, power-generating technologies that can be combined to improve the operation of the electricity delivery system.
a. Energy b. Wind c. Water d. Distributed
To the left of the Txy plot are five overall compositions, pressures, and temperatures for a mixture of R-245fa (1) + isopentane (2). For each combination, list the equilibrium phases, what they are (LLE, VLE, etc) and what are the compositions (in terms of mole fractions) of each of the equilibrium phases.
Z1 = 0.5; P = 0.1 bar; T = 200K
If a co-worker enters a manhole and does not return in a reasonable amount of time,
A. enter the manhole alone and go find him B. let your supervisor know immediately C. send a team into the manhole to rescue him D. wait a few more minutes
The BCD addition of 910 and 710 generates code groups of 1001 0111 and a carry to the next higher position. The final step in the problem is to:
A) add 0110 to the lowest order code group and then prefix the carry with three zeros. B) ignore the lowest order code group because 0000 is a valid code group and prefix the carry with three zeros. C) add 0110 to both code groups to validate the carry from the lowest order code group. D) disregard the carry and add 0110 to the lowest order code group.