Per the IMC, air intake openings shall be located not less than ____ horizontally from any hazardous or noxious contaminant source, such as vents, streets, alleys, parking lots and loading docks?
10 Feet
1/35
| Term | Definition |
|---|---|
| Per the IMC, air intake openings shall be located not less than ____ horizontally from any hazardous or noxious contaminant source, such as vents, streets, alleys, parking lots and loading docks? | 10 Feet |
| Per the UMC, appliances such as suspended-type infrared heaters shall be fixed in position independent of gases and electric supply lines with hangers and brackets that are substantially made of? | Noncombustible material |
| Most commercial refrigerating systems use hot gas mufflers for comfort cooling in air conditioning. Mufflers are usually installed near the condenser, usually vertically. A muffler that is not installed correctly could trap what? | Oil |
| In an R-22 system, evaporator pressure is 60 pounds. What is the corresponding saturated refrigerant temperature? | 34 Degrees F |
| What factors must be directly considered in the determining heat loss for a residential structure? | Difference between indoor and outdoor temperature |
| Pressure relief device located within a machinery room shall terminate at what distance from any opening to the building? | 20 Feet |
| The approximate heat content of natural gas is | 2,500 to 3,200 BTU/FT3 |
| When considering a bely drive motor, where the adjustable motor pulley halves are moved closer together, the fan speed shall? | Increase |
| According to the International Mechanical Code, buildings with permanently installed rood access ladders shall maintain a minimum unobstructed clearance at the base of the landing measuring? | 30"x 30" |
| Every pressure relief valve on a mechanical refrigeration system shall be connected to the refrigerant discharge pipe of the compressor it serves. Where shall these relief valves be located? | Between the compressor and the first shutoff valve at the condenser |
| Based on ACCA's Manual D, which of the following is designed values or core input is required to begin duct sizing calculations? | Blower CFM |
| Which of the following is not a factor in heat loads for a structure? | Heat produced by the outside walls |
| Which of the following refrigerant will have the MOST static loss of pressure across a liquid line with a a 30-foot vertical line? | R-134A |
| What establishes the low side pressure in the evaporator? | Refrigerant control |
| The rupture disc setting for low pressure chillers is normally set at | 15 PSIG |
| Every passageway serving equipment located in an attic or furred space shall have solid, continuous flooring from the access opening to the required working space. The platform shall extend | In the front of the equipment |
| The latent heat of vaporization of R-410A | 117 BTU/LB |
| Commerical kitchen grease ducts shall be designed for the type of cooking appliance and hood served. If the installation calls for a Type I hood, the grease duct must be a minimum thickness steel gage of ____. | 16 Gage |
| A machinery room contains mechanical refrigerating equipment with a ventilating exhaust discharge. What must be the MINIMUM distance between the machinery room's exhaust discharge and any exterior door or window? | 20 Feet |
| Which type of ice maker is used to make ice flakes? | Auger |
| Per the textbook MR & AC, in the operation of a hot gas defrost system, the compressor runs, the hot-gas solenoid valve opens, and the ____ fans stop turning. The hot compressed vapor rushes through the hot-gas defrost valve and into the _____, melting accumulated frost, the refrigerant then returns to the compressor through the suction line? | Evaporator |
| A run capacitor's primary function is to provide a phase shift to the motor windings, thereby optimizing motor performance. A slightly larger capacitor can sometimes improve motor efficiency, but going much larger can lead to other problems. So, when replacing a motor run capacitor, the capacitance can be increased up to _____ of the original valve? | 10% |
| What would be the capacity in cubic feet of gas per hour. Example: The 1/2 gas pipe installation will use Schedule 40 metallic pipe, natural gas, less than 2 PSI inlet pressure, 0.5 inch W.C pressure drop, 0.60 specific gravity? Assume that the length of pipe will be 50 feet | 72 |
| If an employee earns $1,347 each week, what would be the tax liability for the employer and employee for both Social Security and Medicare? | $206 |
| When calculating the percentage of compression of a flexible duct, the change in length divided by the original length calculates the compression percentage. So, a 10-foot flex duct is between two connectors that are 7-feet apart is what percentage compressed? | 30% |
| According to the Uniform Mechanical Code, what is the minimum clear head room required below equipment situated over a passageway in a refrigeration machinery room? | 7.25 Feet |
| An appliance is located in a confined space with all air taken from the outside by means of two vertical ducts. Each opening for combustion shall be a minimum of one square inch per | 4,000 BTU/H |
| All of the following is required and included in the maintenance of air conditioning and refrigeration, except | installation or replacement of complete systems |
| When must an approved smoke detector be installed in an air movement system? | When a return air duct has a design capacity of over 2000 CFM |
| What is the component that releases heat from mechanical refrigeration system? | Condenser |
| What diameter steel duct will deliver 400 CFM at 900 FPM | 9 inch |
| A direct vented appliance rated at 50,000 BTU/H shall be located so that a minimum clearance of ____ is maintained between vent terminals and from any opening through which combustion products enter the bulding | 9 inches |
| What effect does a thermostatic expansion valve with a discharge power element have on an evaporator? | Starved Evaporator |
| What is the static pressure for a 12-inch flex duct with a 15% compression delivering 900 CFM? | 0.50 |
| Per the MR&AC, an air filter made of ____ can remove solid particles, odor causing gases and bacteria. | Activated Carbon |