How can an air-source heat pump heat when the outdoor temperature is cold?
A) All heating is accomplished with electrical resistance heaters, so the air temperature is irrelevant.
B) Air-source heat pumps only use the outdoor air in the cooling season.
C) The friction of the air passing over the outdoor coil raises the temperature.
D) All molecules contain some heat until they reach absolute zero (-460°F).
D
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Controle que los colgantes tengan la longitud correcta _____.
a. después de que se ensamble la pluma b. antes de que se ensamble la pluma c. después de que se conecte el brazo d. después de que se conecte la base de la pluma
While having a discussion, Technician A says that a normally aspirated engine will lose 3% of its horsepower with every 1,000-foot increase in altitude. Technician B says that a turbocharged vehicle will not lose power when driven from low to higher altitude. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
The two general types of sequencers used on electric furnaces are:
A) Mechanical and electronic. B) High-current sequencers and low-current sequencers. C) Fast-acting sequencers and slow-acting sequencers. D) Individual time-delay relays and all-in-one sequencers that control all the strips and the blower motor.
The power output of a water turbine is given by P = pgQh, where P is power,p is density of water (kg/m3), g is acceleration due to gravity (m/s2), Q is water flow rate (m3/s), and h is the available water head (m). What is the appropriate unit for P?
What will be an ideal response?