Topics: All categories in the pool
1: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
2: R-11 has the greatest corrosive effect on
- Bronze
- Aluminum
- Magnesium
- Copper
3: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- king valves
- gate or globe valves
- ball valves
4: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
5: The solution that leaves the concentrator in an absorption chiller is referred to as the
- absorbed solution
- weak solution
- diluted solution
- strong solution
6: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Zinc
- Magnesium
- Nickel
7: 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
8: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
9: The generator shell contains the
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
- evaporator and the absorber
10: The density of a gas refers to
- pounds per absolute pressure
- cubic feet per pound
- pounds per cubic foot
- pounds per square foot
11: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
12: The evaporator is a device to
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
- store liquid refrigerant
- Keep the compressor busy
13: 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
14: If the power element of an expansion valve should lose its charge the valve would
- underfeed the evaporator
- go open
- go closed
- overfeed the evaporator
15: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
16: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- Ceiling height
- 72"
- 7.25'
17: A pressure relief should be located at least _______ from windows and doors.
- 20'
- 25'
- 15'
- 30'
18: What does an anemometer measure?
- voltage
- temperature
- velocity
- amperage
19: Cooling tower lowers condenser water temp by
- condensation
- running fans at 100%
- evaporative cooling
- running water thru a secondary heat exchanger
20: A professional or office building would be considered what type of occupancy?
- public assembly
- business
- mercantile
- commercial
21: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
22: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
23: A class A3 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
24: The measurement of heat in a particular substance is
- sensible heat
- enthalpy
- latent heat
- specific heat
25: What is an example of institutional occupancy?
- Hospital
- Football stadium
- Dorms
- Shopping mall