State Test HVAC Sampler 41723

Commercial Refrigeration is a process in which work is done to move heat from one location to another. The heat transport is traditionally by mechanical or absorption control of ___.

• non-cyclic cooling
• low-temperature absorption
• vapor-compression
• humidity and temperature
• Refrigeration MR20thEd 21.1.8

The access door for a fire damper shall be labeled with letters NOT less than ___ in height.

• 1/2 inch
• 3/4 inch
• 1 inch
• 1 1/2 inch
• Mechanical IMC 2018 607.4

Clear space above ground of the lowest portion of mechanical equipment suspended from a floor shall be AT LEAST ___ inches.

• 6
• 4
• 10
• 8
• Fuel Gas IFGC 2018 305.7

Authorized personnel must inspect excavations, when is it necessary to inspect such excavations?

• at least every other day
• for flagging
• after every rainstorm
• at least once a week
• OSHA OSHA

What is the effect of sensible heat?

• it changes the state of a substance without changing its temperature
• it changes the temperature of a substance without changing its state
• it changes both the state of a substance and its temperature
• it does not change the temperature or the state of a substance
• Refrigeration MR20thEd 67

Regarding motors: ONE horsepower equals to ___.

• 30.0 ohms
• 27.8 amps
• 746.0 watts
• 120.0 volts
• Refrigeration MR20thEd 340

What effect does rising temperature have on a container of saturated vapor and liquid refrigerant?

• has no effect
• saturated vapor volume decreases
• pressure increases
• liquid volume decreases
• Refrigeration MR20thEd 248

Which instrument is used to obtain air velocity values?

• hydrometer
• pedometer
• odometer
• anemometer
• Refrigeration RACT8thEd 1098

What system problem can be avoided by correctly sizing the low-side filter drier at the compressor end of the suction line?

• Flood back to the compressor
• Expansion valve hunt
• Resistance to flow of the vaporized refrigerant
• Compressor over heating
• Refrigeration MR20thEd 22.2.4

With proper care, nitrogen or carbon dioxide may be used safely when pressure testing for leaks. What safety precaution must be followed when pressure testing for leaks?

• use a pressure reducing device that has both a pressure regulator and a pressure relief valve.
• pre-test each device prior to installation.
• use refrigerant in system to test for leaks.
• test for negative pressure at the start of testing.
• Refrigeration MR20thEd 11.3.1