Hvac test stuvia Study guides, Class notes & Summaries

Split-phase motor PSC CSCR Shaded pole motor Resistance reading to ground from the terminal of a good compressor CSR Best starting and running single-phase compressor - ANSWERA. Uses a start and run winding B. Uses a run capacitor C. Uses a run capacitor, start capacitor, and potential relay D. Simplest motor E. 3 megohms F.Only uses a start capacitor G. CSCR motor How much resistance will be measured in a circuit with 240V and amp draw of 10A? - ANSWER24Ω

A listed smoke damper designed to resist the passage of smoke shall be provided at each point in a duct or air transfer opening penetrates a: (A)smoke barrier wall (B)fire rated wall (C)interior wall (D)corridor wall - ANSWER Corridor wall (IMC 607.5.4) Flexible air duct may be what length? (A)10' (B)2' (C)14' (D)6' - ANSWER 14' (IMC 603.6.1.1) The maximum vertical distance between the front lower lip of a canopy Type 1 hood and the appliance surface shall be ____ feet: (A)5' (B)3' ...

Split-phase motor PSC CSCR Shaded pole motor Resistance reading to ground from the terminal of a good compressor CSR Best starting and running single-phase compressor - ANSWER A. Uses a start and run winding B. Uses a run capacitor C. Uses a run capacitor, start capacitor, and potential relay D. Simplest motor E. 3 megohms F.Only uses a start capacitor G. CSCR motor How much resistance will be measured in a circuit with 240V and amp draw of 10A? - ANSWER 24...

Two locations where a cold air return should be installed - ANSWER open area of a wall and low to the ground Which of the following is the law of thermodynamics? - ANSWER heat moves toward a place with lower intensity Sensible heat describes - ANSWER how hot something feels Latent heat is measured in - ANSWER british thermal units What is the amount of heat energy required to evaporate 1 pound of water? - ANSWER 970 btu In an air conditioning system and refrigeration system, what ...

Sensible Heat - ANSWER Heat that can be Measured Specific Heat - ANSWER The Amount of Heat Required to Raise 1 LB of a Substance 1*F Latent Heat - ANSWER Heat used to cause change of state. BTU - ANSWER amount of heat required to raise 1LB of water 1*F One Ton of Refrigeration - ANSWER 2000 x 144 x 24,288,000 Btu/24hours, and 12,000 Btu/hr A Room Thermostat Should be Mounted - ANSWER 5 feet from the floor To Provide Proper Oil Return to the Compressor - ANSWER Suction line must...

True - ANSWER Copper wire bend easily, has good mechanical strength, resists corrosion, and can be easily joined. True - ANSWER Aluminum is a good conductor of electricity, however, it has a tendency to corrode. False - ANSWER Voltage drop in a conductor is of least importance when sizing wire. False - ANSWER The maximum recommended voltage drop for a branch circuit is eight percent. False - ANSWER The allowable voltage drop of most manufacturers is 15% below the nameplate rating. ...

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? - ANSWER1,920 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 _________? - ANSWERCrankcase heater Find the MINIMUM size chimney requ...

Which of the following statements is true? A. Heat travels from a cooler area to a warmer area B. When liquids evaporate, heat is released C. When a gas condenses to a liquid, heat is absorbed D. When a liquid boils, heat is absorbed - ANSWERD. When a liquid boils, heat is absorbed Which of the following best describes the principle of latent heat of vaporization? A. Heat energy required to change a liquid to a vapor without raising its temperature B. Heat released from a vapor as it c...

1. Which of the following occupations is part of the Design/Preconstruction career pathway? - ANSWERHVACR (mechanical) drafter 2. Installing refrigeration units on the roof of a new grocery store would be completed by someone in an occupation found in the _ pathway. - ANSWERconstruction 3. Which of the following occupations is likely to spend the most time using computer-aided design software? - ANSWERHVACR DRAFTER 4. Performing load calculations to specify equipment for a refrigerati...

T or F? The electrical cords for domestic refrigerators are insulated to withstand twice their normal voltage. - ANSWERTrue Most compressors used in domestic refrigerators use _____________ motors. - ANSWERSplit-Phase T or F? During startup, a motor may draw an overload of current that may amount to 600% of the running load. - ANSWERTrue The type of metering device most commonly used in domestic refrigerators or freezers is the _____________. - ANSWERCapillary Tube T or F? The fuse o...