What is (a) the highest, and (b) lowest rate of return (in percent) possible?
What will be an ideal response?
(a) Highest possible is infinity
(b) Lowest possible is -100%
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How does a closed expansion tank work?
A) The top of the tank is open to the atmosphere. B) It uses a flexible diaphragm with an air charge above the diaphragm. C) The walls of the tank are made of a flexible material. D) Air is trapped at the top of the tank.
In terms of snow load, what is a cool roof and what is a warm roof?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. The typical air handler is powered by a multispeed motor that can generally operate at two speeds. 2. The rapid cooldown of an evaporator coil results in increased moisture removal. 3. The factors that determine the amount of torque produced by the brushless DC motor are the same as those for any other electric motor. 4. Brushless DC motors can exhibit efficiency as high as 90%. 5. The brushless DC motor is controlled by a circuit board located in the air handler.
Which of the following is a function of fluxes used in brazing and soldering?
A. They must prevent wetting. B. They must discourage capillary action. C. They must remove oxides that form from heating parts D. They must encourage oxides to form in the heated parts.