Topics: All categories in the pool
1: Which is considered the more efficient condenser?
- water cooled
- fan cooled
- spray cooled
- air cooled
2: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
3: When must refrigeration system covered by the code be inspected?
- Upon installation
- Annually and when installed
- Not required
- Annually
4: Most CFC's are
- inert but toxic
- inert
- toxic
- flammable
5: The principle used in continuous type absorption systems is
- Charles's Law
- Ohm's Law
- Boyle's Law
- Dalton's Law
6: Where would the EPR valve be located on a multiple evaporator system?
- outlet of low temperature evaporator
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
- outlet of the liquid line
7: It takes how many BTU/hr to melt one pound of ice at 32F
- 180
- 970
- 144
- 212
8: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
9: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- 2.5 times the design pressure
- the high side
- the low side
10: When an inspection is needed, how often must it be done?
- annually
- every 36 months
- every 24 months
- every 18 months
11: R-717 is
- carbon dioxide
- trichloromethane
- ammonia
- water
12: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
13: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- load-side of the contactor in
- breaker panel in
- first disconnect in
- 24 volt secondary side of the Class 2 transformer to the thermostat
14: What refrigerant is an inorganic compound?
- R-410A
- R-132A
- R-22
- Ammonia
15: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low pressure switch
- thermostat
- low-ambient controller
16: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
17: What type of oil is used in R-410A systems?
- mineral oil
- polyolester (POE)
- naphthene
- polyalkylene glycol (PAG)
18: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
19: Mercury was used in thermometers primarily because it
- never freezes
- expands uniformly
- vaporizes at very high temperatures
- was inexpensive
20: The density of a gas refers to
- pounds per absolute pressure
- pounds per square foot
- cubic feet per pound
- pounds per cubic foot
21: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
22: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 700F
- 1000F
- 600F
23: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 240v
- 208v
- 277v
- 120v
24: A tachometer is an instrument used to measure
- RPM
- speed
- air velocity
- static pressure
25: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct