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The density of air is A: How much air weighs per cubic foot B: How much volume one pound of air occupies C: The ratio of the weight of water to that of the same volume of water D: The ratio of the amount of water vapor contained in a cu. ft. of air to the amount of moisture held at saturation -...

With the condensing pressure and compressor speed remaining constant, a decrease in suction pressure will cause a(n): a. Decrease in compressor capacity and decrease in current. b. Increase in compressor capacity and decrease in current. c. Increase in compressor capacity and increase in current...

Fan law: Pulley size Formula - Answer-DPm X RPMm = DPf X RPMf DP=Diameter of Pulley f=Fan or Driven m=Motor or Driver Actual Brake HP of a motor - Answer-BHP = HPnp( Amps/FLA) np = Name plate Synchronizes speed of a motor - Answer-7200 / # of poles Convert Velocity pressure (Vp) into Feet Per ...

The Fahrenheit scale is based on boiling water at sea level at what temperature? A: 459 degrees B: 212 degrees C: 180 degrees D: 100 degrees - Answer-B: 212 degrees Zero pounds gauge corresponds on the absolute scale to: A: 144 B: 212 C: 14.7 D: zero - Answer-C: 14.7 Hidden heat in refrige...

In HVACR terms, what is a feature? - Answer-A special characteristic of a product. In HVACR terms, what is a benefit? - Answer-The value the customer receives from using the feature What type of temperature is often used by customers when discussing human comfort? - AnswerDry bulb What is an hone...

formula to convert celsius to fahrenheit - Answer-F = (1.8 x C) + 32 formula to convert fahrenheit to celsius - Answer-C = .56 (F - 32) specific heat - Answer-the amount of heat required to raise 1 lb of a substance 1 degree fahrenheit sensible heat - Answer-Is the heat that came be measured or s...

Charging a heat pump with refrigerant is best accomplished in the _______ mode. A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode - Answer-B: Cooling mode Heat pumps can provide both heating in the winter and cooling in the summer. In which mode is the heat pump more ef...

Class A - Ordinary Extinguisher Class B - Liquid Extinguisher Class C - Electrical Extinguisher Asphyxiation causes what? - Nausea, Dizziness, Heart Irregularities, and Unconciousness Ladder must be at what dimensions in relation to a house? - 4 ft for every 1 ft, 3 ft above the top of the roof...

Since 1992, the United States Department of Energy has required that all furnaces sold and installed from that date on must have an AFUE of no less than: A: 70% B: 75% C: 78% D: 80% - Answer-C: 78% Many pre-1992 furnaces have efficiencies around _______. A: 10% B: 40% C: 60% D: 80% - Answe...

A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant ch...

Which of the following factors affects a customer's level of comfort? a. Air movement b. Humidity c. Temperature d. All of the above - Answer-d (All of the above: air movement, humidity, temperature) A cooling load calculation estimates the sensible heat gain of a structure. The maximum sensib...

NATE A/C Exam 1 Low airflow over a residential split system air conditioning evaporator can cause A: Liquid flood-back to the compressor B: A decrease in compression ratio C: An increase in suction line superheat D: Oil logging in the evaporator - Answer-A: Liquid flood-back to the compressor ...