HVAC contractor exam test 7 100% CORRECT

How much heat is required to melt a 10 pound block of ice that is sitting at 32 degrees F into warm water given that the heating temperature is at 80 degrees F? -ANSWER 1,920 Btu/h In many condensing unit applications, it is necessary to heat the compressor to evaporate liquid refrigerant trapped in the oil. Many large compressors for commercial applications are manufactured and equipped to handle this situation using a _________? -ANSWER Crankcase heater Find the MINIMUM size chimney required: A fan assisted Category 1 appliance with an input rating of 55,000 Btu/h is to be vented with a single wall connector into a masonry chimney that is 20 feet high with a 10 foot lateral. -ANSWER It is not recommended that this appliance be connected tot his chimney Given that a motor compressor has a 2" bore and a 3" stroke, what would be the calculated piston displacement in cubic inches? -ANSWER 9.42 A grain is a unit of weight equal to ___________, used to indicate the amount of moisture in the air. -ANSWER 1/7000 lb When computing heat leakage for a building, the U-value for most types of construction can be obtained from reference books. The unit of measure for U-value is expressed in __________? -ANSWER Btu/sq-ft/deg.F/Hr