Topics: All categories in the pool
1: Pressure is the equivalent of
- force per unit area
- force
- force times area
- area times force
2: What is Trichlorotrifluoromethane?
- R-13
- R-12
- R-113
- R-11
3: The best way to detect ammonia in brine is
- nessler regaent
- CO2 gas
- carbonation of soda
- potassium of line
4: What measures gas pressure?
- Manometer
- Hygrometer
- Barometer
- Hydrometer
5: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 50
- 75
- 20
- 15
6: A movie theater would be considered a
- mixed occupancy
- public assembly occupancy
- institutional occupancy
- commercial occupancy
7: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- store liquid refrigerant
- provide space for the accumulation of oil and containminants
- prevent liquid slugs at the compressor
8: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-1
- A-2
- B-2
9: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When there are sprinklers above
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system
10: In an A/C unit, dirty filters will cause
- low suction pressure
- high discharge pressure
- low oil pressure
- high suction pressur
11: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- release the charge when the pressure exceeds 310 psig or higher
- Pumpdown procedures are not allowed with systems containing liquid recievers
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
12: 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
13: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
- Nothing must be done
14: Which is considered the more efficient condenser?
- air cooled
- fan cooled
- spray cooled
- water cooled
15: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of vaporization
- passing thru the tubes from top to bottom
- water sprayed over condenser
- removing the latent heat of fusion
16: A secondary coolant is defined as
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- any refrigerant direcly in contact with the cooling space for process cooling
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
17: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
18: When an electronic bridge is in balance the bridge output will be
- 0 volts
- 1 volt
- .01 volts
- 15 volts
19: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
20: A declaration test is needed when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
21: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
22: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 1K amps
- 1.6 amps
- 106 amps
23: Which refrigerant is lighter than air?
- R-717
- R-123
- R-134a
- R-11
24: Ammonia (NH3) is a group III refrigerant
- True
- False
25: 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.
- 7.00'
- 8'4"
- 9.00'
- 7.25'