What is a dual-fuel heat pump?
A) An air-source heat pump added to a fossil fuel furnace.
B) A heat pump that can run on either AC or DC power.
C) A heat pump whose energy requirements are so massive that two fuel sources are required to operate it.
D) A heat pump that can be field converted from air-source to water-source.
A
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Aster yellows is caused by which group of organisms?
a. fungi c. viruses b. bacteria d. mycoplasma-like organisms
The charge cycle shown in Figure P2.4 is an example of a three-rate charge. The current is held constant at 30 mA for 6 h. Then it is switched to 20 mA for the next 3 h. Find: a. The total charge transferred to the battery. b. The energy transferred to the battery.
Hint: Recall that energy w is the integral of power, or P = dw/dt.
Some brake drums are finned to help them dissipate heat more efficiently.
Answer the following statement true (T) or false (F)
Open-end wrenches are often manufactured with a __________ offset angle so the user can easily turn a hex head bolt or screw completely by flipping the wrench over.
A. 15° B. 30° C. 50° D. 65°