Topics: All categories in the pool
1: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
- Never can be allowed
- Approved by the installing contractor
2: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
- Because it's a non-flammable refrigerant
- Because it's water
3: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
4: Humidity can be sensed with
- bimetal
- pressure bellows
- thermometer
- human hair
5: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Anyone, it's a completely safe area
- Any employee
- Contractors only
6: Viscosity is
- measure of weight
- the ability of oil to flow
- a measure of heat content
- the coefficient of external friction
7: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- tight fitting doors
- automatic ventilation
- self-closing doors
8: In an A/C unit, dirty filters will cause
- high discharge pressure
- low oil pressure
- low suction pressure
- high suction pressur
9: In a motor, an internal overload might open if
- there's an open start winding
- there's an excess current draw through the motor
- there was a high pressure refrigerant was used for a low pressure system.
- there's a direct short
10: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature below which water vapor in the air will start to condense
- the temperature of air of 50% RH
11: Each machinery room shall contain
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- high and low pressure controls
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
12: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
13: Megaohm meters can detect a ground in the
- 10,000,000 ohms or higher
- up to 10,000 ohms
- up to 1,000,000 ohms
- up to 1,000 ohms
14: 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
15: What is used to check very low pressure?
- Hydrometer
- Velometer
- Manometer
- Hygrometer
16: A direct system
- is a self-contained complete factory made and tested system
- is one which encloses a separate body of evaporative refrigerant
- is on where brine is cooled & circulated to the space refrigerated
- is where the refrigerant comes in contact with the space refrigerated
17: What would be the classification for Stop & Shop grocery store?
- Large mercantile
- Industrial
- Place of assembly
- Instituional
18: The generator shell contains the
- evaporator and the absorber
- condenser and the absorber
- condenser, the evaporator, and the generator
- condenser and the generator
19: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- every 18 months
- annually
20: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the warmest evaporator
- Suction line prior to the accumulator of the lowest temperature system
- Suction line at the compressor
- Suction line of the coolest evaporator
21: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
22: The difference between saturated liquid and saturated vapor is
- heat
- temperature
- pressure
- volume
23: 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
24: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 29F
- 9F
- 21F
- 11F
25: A device used to measure small pressure differences is the
- phsycometirc
- pyrometer
- anemometer
- manometer