Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

1: Two systems using separate refrigerants that are superimposed upon one another is called

• cascade
• booster
• indirect
• single stage

2: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

• boost voltage
• run voltage
• lift voltage
• pick up voltage

3: The principle used in continuous type absorption systems is

• Ohm's Law
• Charles's Law
• Dalton's Law
• Boyle's Law

4: What is the purpose of a surge capacitor on a contactor?

• to balance the sine waves
• to keep the contactor pulled in
• to provide smoother start/stops
• to protect low voltage equipment

5: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

• True
• False

6: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

• Electricity
• Oil
• Heat
• Air

7: Which oil is hydoscopic?

• animal
• SW30
• polyolester
• mineral

8: The low pressure oil safety switch

• must be reset manually
• never trips
• resets itself automatically
• resets itself after the time delay has terminated

9: What is the minimum size wire you can use on a 30 amp circuit?

• 12 AWG
• 16 AWG
• 14 AWG
• 10 AWG

10: R-123 belongs to Group

• B-3
• A-3
• B-2
• B-1

11: What instrument is used to measure very high resistance?

• meg ohmmeter
• voltmeter
• ammeter
• tape measure

12: Ammonia belongs to Group

• A-1
• B-1
• B-2
• A-2

13: "I" represents ____ in the Ohm's law formula.

• capacitance
• resistance
• amperage
• voltage.

14: The most common type of motor starter is

• delts-wye starter
• across the line starter
• duel-winding starter
• part winding starter

15: Copper and its alloys shall not be used with ammonia

• True
• False

16: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

• sight glass, weight, pressure, and dipstick
• Buss-eye, weight, pressure, and frost line
• sight glass, weight, pressure, and frost line
• sight glass, weight, paper method, and frost line.

17: A Low-Probability System

• is such that a leak of refrigerant from a failed connection will enter the occupied space
• is such that a leak of refrigerant from a failed connection can not enter the occupied space
• is a system highly likely to leak form a failed connection or component of such system
• is such that any leak will cause injury or death to anyone within a 100 square foot area

18: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

• liquid line that is too small
• shortage of refrigerant
• liquid line that had too high vertical lift
• All of the above

19: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

• 30 days
• 2 months
• 14 days
• 1 week

20: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

• mercantile occupancy
• business occupancy
• commercial occupancy
• public assembly occupancy.

21: Transformers are rated in

• volts-ohms
• amps
• volts
• volt-amps

22: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

• a ling psychrometer doesn't have two theremometers.
• 2F difference
• nearly the same
• far apart or greater difference

23: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

• 255 psig
• 365 psig
• 125 psig
• 327 psig

24: Whoever owns/uses a refrigeration or air conditioning system covered by this code

• must notify the Department of Public Safety prior to starting the system
• shall be licensed by the Commonwealth of Massachusetts according to CMR 522
• shall make application for inspections to the Chief of Inspectors
• None of the above

25: Direct systems using Group II refrigerants

• shall be installed per instruction of the AHJ
• shall be allowed to be used for human comfort.
• shall be installed in Class T machinery rooms
• shall not be used for air condition for human comfort