According to the International Mechanical Code, a Type I grease hood has a horizontal change in direction of 60°. What is the required minimum distance of a clean out opening from this change in duct direction?

10 feet

According to the uniform, mechanical code, what is the ratio of cubic feet to BTUs that define a confined space?

50 ft.³ per 1000 BTUs

Starting relays are used in hermetic compressor motors to drop out of the circuit?

Start windings

What condition prohibits the use of single-wall vent piping for a residential gas furnace?

When the vent runs through the interior concealed spaces

Using the ADI duct size calculator at 1300 CFM, and the design friction loss 0.8, what would be the minimum size metal duct required?

10 inch

When brazing a site glass in the liquid line, at what minimum temperature can the chemical in the site glass be adversely affected?

275°

According to the Uniform Mechanical Code, what is required for securing joints between sections of connector piping and connections to flue collars or draft hood outlets?

Sheet metal screws

What determines air pressure at the earths surface?

Weight of the air above the Earth

What type of device senses an off-line condition and shuts down the offending piece of equipment in order to prevent a hazardous condition?

Interlock

How soon after a fatal incident must the death be reported to OSHA?

Eight hours

a portable refrigerator. Container shall not be connected to any refrigerator system longer than

Necessary to charge or discharge the system

What is the applied voltage across an electric heater with a total current draw of 22 AMPS and a resistance of 11 OHMS?

242

When sizing the section line, what is the maximum saturation temperature drop of the refrigerant?

2° F

A hot water boiler adjustment is important to avoid injury or scalding. A typical setting for the boiler heater would be between the temperature range of

140 - 160°F

a compressor with the displacement of 10 in.³ actually pumps 6 in.³. What is its volumetric efficiency

60%

At what condition will moisture in the air begin to condense?

Dewpoint

Per the IFGC, exhaust ducts shall have a smooth interior finish, and the exhaust duct size shall be ____ nominal in diameter

4 inches

The UMC defines ____ as an organization, primarily established for purposes of testing to approved standards and approved by the Authority Having Jurisdiction

Approved testing agency

Sub cooling temperature is the difference between the saturated liquid temperature and the liquid line temperature. Given the following conditions, what is the calculated subcooling temperature? - Saturated Liquid Temp 127°F - liquid line temp 113°F - Outdoor wet bulb temp 94°F

32°F

Combustion air openings for fuel, gas equipment, located and confined spaces that connect with addicts or directly communicate with outdoors may have one opening with one square inch per?

3000 BTU per hour of the input rating of all appliances in the space

Insulation applied to the exterior surface of ducts located inside a building, other than dwellings or apartments, shall have a flame spread rating of not more than

25

What is a possible result of insufficient combustion air?

burner flames with yellow tips

An agreement to perform work, made either verbally or in writing, either personally or by having an employee perform the work is a

Contract

The IMC specifies that combustion air ducts, whether for direct or vertical openings, must have a minimum cross sectional dimension of ____? This ensures adequate airflow for combustion and dilution air to fuel burning appliances.

3 inches

According to the uniform, mechanical code, what is the clearance from combustible material for a type B residential boilers and furnaces with listed gas conversion burner with draft hood connector?

6 inches

Per the MR & AC an ____ is a heat exchanging device that absorbs heat into its refrigerant

Evaporator

Occupants of space shall feel attractive air is moving at velocities more than how many feet per minute

25 to 30

Low temperature, silver alloy, brazing metals have a flow point of

Starts melting at 1120°F and flows at 1145°F

The thermal conductivity (k) of a material is a measure of

How quickly heat can travel through it

Unless the venting system is an integral part of a listed appliance, in no case shall the area of an venting system be less than

3 inches in diameter

a floor above a crawlspace that is composed of rough pine flooring, wood lath, and plaster ceiling with a total R value of 3.57 will have a U-value of

0.0280

Welded fittings used in steam piping systems must be

Black steel

Per the MR&AC the absolute pressure is gauge pressure plus atmospheric pressure therefore, what would be the calculated value of the absolute pressure when the pressure gauge reading is 60 psi

75 PSIA

Piping shall be supported at distances, not exceeding the spacing specified in the IMC So the maximum horizontal spacing shall be less than ____ for the PVC piping?

4 feet

Which types of circulator pumps are typically used in hydronic systems?

Centrifugal Pumps