Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
sight glass, weight, pressure, and frost line
Buss-eye, weight, pressure, and frost line
sight glass, weight, pressure, and dipstick
sight glass, weight, paper method, and frost line.
2: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
are obsolete.
depends on the type of refrigerant being used
False
True
3: Increasing superheat will do what to your system?
Decrease liquid flow
Increase liquid flow
Nothing
Increase gas flow
4: The Board of Boilers adopts by reference
the MACS Pressure Vessel Code of Massachusetts
the 1997 ANSI/ASHRAE Safety Code
Montreal Protocol Safety Code
MSCA Code
5: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
2.5
1250
There isn't enough information to answer.
2
6: Which of the following is not an air velocity meter?
Velometer
Hydrometer
Anemometer
Anemotherm
7: Which of the following controllers would you expect to be most sensitive to temperature changes?
immersion controller
line voltage t-stat
aquastat
low voltage t-stat
8: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
9: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
1 week
14 days
2 months
30 days
10: Total heat of a substance is considered
enthalpy
sensible heat
specific heat
empathetical
11: How many volts would you read on a 480V system phase to phase?
0
277
1/3 the voltage
480
12: What section governs pressure vessels?
OSHA
Section ASHREA 34
Section 8 ASHREA 15 ASME unfired
Section 1 ASHREA 15 ASME fired
13: Liquid level gauges must be provided with what?
A relief valve
A low level mark
A red line
Automatic shut-offs
14: 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
15: Megaohm meter's main function is
to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
to detect very high resistances to ground of refrigeration or air conditioning compressors
to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
Both a and b are correct
16: What type of copper is not permitted on refrigeration systems?
Type K
Type M
Type L
Type N
17: Which winding have the most turns?
run
Start
depends on the motor phase
they have equal amount of turns
18: What is an example of institutional occupancy?
Football stadium
Hospital
Dorms
Shopping mall
19: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
CFM and RPM decrease
CFM and HP decrease
CFM and HP increase
RPM and CFM increase
20: R-123 belongs to Group
A-3
B-3
B-2
B-1
21: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
high pressure
design pressure
low pressure
critical pressure
22: What are the three components of a transformer?
Contacts, secondary coil, and core
Primary core, secondary coil, and high and low voltage connectors.
Primary coil, secondary coil, and core
Primary coil, secondary coil, and copper contacts
23: What instrument is used to measure very high resistance?
voltmeter
tape measure
meg ohmmeter
ammeter
24: What was the main reason for enacting the no venting rule of July 1, 1992?