Topics: All categories in the pool
1: Two systems using separate refrigerants that are superimposed upon one another is called
- cascade
- single stage
- indirect
- booster
2: Large mercantile occupancy is
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
3: R-11 has the greatest corrosive effect on
- Aluminum
- Magnesium
- Bronze
- Copper
4: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
5: Name a reason that does not cause reduced condenser air quantity
- High ambient temperature
- Prevailing winds
- Dirty Coil
- Dirty fan blades
6: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
- one ton of cooling
7: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Relief valve
- Circuit Breaker
- Temperature limiter device
- T&P device
8: A EPR valve is installed on what type of evaporators?
- plate evaporators
- shell and tube evaporators
- high-temperature evaporators
- low-temperature evaporators
9: Doors communicating with outside from a mechanical room must be?
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door
10: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-1
- A-2
- B-2
11: The instrument used to measure the specific gravity of absorption chiller solutions is the
- anemometer
- refractometer
- Psychrometer
- hydrometer
12: Pipe identification labels are required when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
13: A chiller entering and leaving temperature difference is?
- 50 degrees F
- 10 degrees F
- 5 degrees F
- 20 degrees F
14: What is the minimum size wire you can use on a 30 amp circuit?
- 12 AWG
- 14 AWG
- 10 AWG
- 16 AWG
15: An oil pressure safety switch should be set at
- 5 to 10 psi above low side pressure
- 5 to 10 psi below low side pressure
- 10 to 15 psi below low side pressure
- 10-15 psi above low side pressure
16: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the coolest evaporator
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the warmest evaporator
- Suction line at the compressor
17: Capacity control on a centrifugal compressor is accomplished by the
- slide vanes
- pre-rotational guide vanes
- check valves
- post-rotational guide vanes
18: A hissing noise at the expansion valve is a good indication that
- liquid is passing thru it
- gas is passing thru it
- expansion valve is oversized
- nothing is passing thru
19: The actual expansion curve of compression follows most nearly which one of the following curves?
- Volume Temperature
- Pressure Temperature
- Adiabatic
- Isothermal
20: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Contractors only
- Anyone, it's a completely safe area
- Any employee
21: A thermometer inside a duct measures ____ heat.
- specific
- hidden
- sensible
- latent
22: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
23: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- 1250
- 2
- 2.5
- There isn't enough information to answer.
24: A Low-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
25: All serviceable components of a refrigeration system shall be provided with
- service manuals
- safe access
- manufactures instructions on start-up procedures
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code