Topics: All categories in the pool
1: How many refrigerant classifications are there for toxicity?
- 2
- 3
- 5
- 1
2: A start capacitor is wired in _____ with the start windings.
- parallel
- junction
- series-parallel
- series
3: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- concentrated solution
- absorbed solution
- weak solution
- strong solution
4: Who approves containers for refrigerants?
- E.P.A
- D.O.D
- D.O.T
- D.O.E
5: Excessive head pressure is often caused by
- insufficient refrigerant
- leaking reed valve on the discharge side
- thermostat set too high
- air cooled condenser is plugged
6: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 45F
- 155F
- 32F
- 158F
7: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Oil
- Air
- Electricity
- Heat
8: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
9: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
10: Suction line oil traps should be installed when the condenser is
- in the basement and the evaporator is on the third floor
- more than 100' away from the evaporator
- located outside the operates in temperatures below 35F
- on the third floor roof and the evaporator is in the basement
11: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-12
- R-113
- R-11
12: Who authorizes changes to the safety codes?
- Board of Boilers
- Contractor who last serviced the system.
- Person who pulled the permit
- Person in charge of the facility
13: 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
14: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- provide space for the accumulation of oil and containminants
- prevent liquid slugs at the compressor
- store liquid refrigerant
15: Which of the following controllers would you expect to be most sensitive to temperature changes?
- line voltage t-stat
- immersion controller
- low voltage t-stat
- aquastat
16: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
17: If two 500 ohm resistors are connected in series, the resistance will be
- 1000 ohms
- 200 ohms
- 20 ohms
- 500 ohms
18: Which is considered the more efficient condenser?
- spray cooled
- water cooled
- fan cooled
- air cooled
19: The location of a thermal bulb of a TXV affects
- the amount of liquid in the condenser.
- the amount of liquid returning to the compressor
- the amount of liquid refrigerant in the evaporator
- subcooling
20: When should a relief valve start to function?
- 10 psi before it's set pressure
- Before the purge station discharges
- At it's set pressure
- Two times it's working pressure
21: When energized, a normally open relay will be
- open
- depends on the type and class of the relay
- noisy
- closed
22: RPM's of a centrifugal compressor are at approximately?
- 15,000
- 30,000
- 10,000
- 500
23: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
24: The Department that certifies the transportation of refrigerant is the
- EPA
- DOT
- EPO
- RSES
25: A pressure relief should be located at least _______ from windows and doors.
- 25'
- 30'
- 20'
- 15'