HVAC Questions and Answers Pack | New One | Grade A+

How much current is drawn by a 120V circuit containing a 1,500W load? Ans: 12.5A How much power is consumed by a 120V parallel circuit that contains a 100 load and an 80 load and draws 2.7A? Ans: 125W What characteristic do devices that use DC instead of AC power often have in common? Ans: Th...

senible heat Ans: Heat that can be measured by a thermometer latent heat Ans: heat required to create a phase change without a change in temperature. Phychrometric Ans: The study of air and its properties What is enthapy? Ans: The total measure of heat content in the air and is made up of sen...

When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system? Ans: The correct answer is: Charge as a liquid through the low side using a restrictor. The factory charge in a split system, using R-22, shows 6 lb. 8 oz. in the ou...

50 degrees centigrade equals Ans: 122 degrees F. (1.8 x C + 32F). An evaporator, generator, absorber, is a Ans: component of an absorption water chiller. A British Thermal Unit is Ans: the amount of heat required to change, one pound of water one degree Fahrenheit. A centrifugal compressor is ...

The man whose work is considered the real beginning of the science of air-conditioning _____. Ans: Willis Carrier Psychrometry refers to the relationship between _____ and _____. Ans: Humidity; air The amount of moisture in the air compared to how much it can hold is _____. Ans: Relative humi...

thermostat Ans: Is a temperature dep endent valve that opens and closes according to the engine coolant temperature to regulate the flow of coolant through the radiator and back to the engine Coolant Pump Ans: Are mechanically controlled devices that circulate coolant through the radiator and ...

Which of the following would have the greatest effect on the heat content of the refrigerant? A) The refrigerant's humidity B) The refrigerant's state C) The refrigerant's temperature D) The refrigerant's pressure Ans: Correct Answer B) The refrigerant's state A mechanical refriger...

Clearance tolerances are such that the ordinary clean refrigerant oil can be used satisfactorily in a vacuum pump. Ans: false The maximum recommended pressure for leak testing is 150 psig on the low-pressure side of the system. Ans: true Noncondensable gases ____. Ans: are undesirable in a ...