Topics: All categories in the pool
1: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
2: R-12 is
- dichlorodifluoromethane
- trichlorofluoromethane
- dichloromethane
- dichlorofluoromethane
3: What measures gas pressure?
- Manometer
- Hygrometer
- Barometer
- Hydrometer
4: A single pole-double throw switch used how many wires excluding the ground wire?
- five
- four
- two
- three
5: When should a relief valve start to function?
- Two times it's working pressure
- At it's set pressure
- Before the purge station discharges
- 10 psi before it's set pressure
6: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- lower
- the same
- higher
7: A start capacitor is wired in _____ with the start windings.
- series-parallel
- junction
- parallel
- series
8: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 8'4"
- 7.25'
- 7.00'
- 9.00'
9: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 600 psig
- 200 psig
- 1000 psig
10: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- higher
- the same
- there is no Group B1 refrigerants
11: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat giving by the condenser
- the heat lost by the medium being cooled
- the heat of compression
12: What is potential measured in?
- Ohms
- Volts
- Amps
- Henrys
13: What refrigerant doesn't have to be classified?
- R-134A
- R-717
- R-718
- R-422A
14: Humidity can be sensed with
- thermometer
- pressure bellows
- bimetal
- human hair
15: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
16: Suction line oil traps should be installed when the condenser is
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
17: What is used to check very low pressure?
- Velometer
- Hygrometer
- Hydrometer
- Manometer
18: What is a Category "D" fluid?
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- Any fluid that exceeds 150 psig and has design temperature of over 366F
19: 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.
20: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 1,000
- 110
- 6.6
21: An example of an "Expendable Refrigerant" is
- liquid oxygen
- liquid nitrogen
- ammonia
- lithium bromide
22: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
23: 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
24: Adjusting the spring pressure on a TXV
- makes no difference
- changes subcooling
- adjusts the bulb charge
- changes superheat
25: Horizontal piping should be run level.
- Yes, if the condenser is located above the evaporator
- True
- No, unless the supervisor on the job says so.
- False