Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What is the temperature that a liquid and a vapor can exist in equilibrium called?
Dry bulb temperature
Saturated temperature
Critical temperature
Wet bulb temperature
2: Suction line oil traps should be installed when the condenser is
on the third floor roof and the evaporator is in the basement
in the basement and the evaporator is on the third floor
located outside the operates in temperatures below 35F
more than 100' away from the evaporator
3: A start capacitor in series with a start winding will
increase the amp draw of the motor
increase running efficiency
decrease the amp draw of the motor
increase starting torque
4: How far from the window does a relief valve need to be according to ASHRAE-15?
At least 30'
At least 40'
There is no minimum for relief valve and windows.
At least 20'
5: A hissing noise at the expansion valve is a good indication that
nothing is passing thru
gas is passing thru it
liquid is passing thru it
expansion valve is oversized
6: "I" represents ____ in the Ohm's law formula.
voltage.
resistance
capacitance
amperage
7: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
9F
11F
29F
21F
8: The best way to detect ammonia in brine is
CO2 gas
potassium of line
carbonation of soda
nessler regaent
9: A relief valve discharge capacity is rated in
temperature minus pounds of air per second divided by release rate squared
PSIG
PSIA
Pounds of air per minute.
10: What is an egress?
An escape route
A code violation
A valve put on the low side of the system to prevent frosting
An entrance or exit
11: 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 HP decrease
CFM and HP increase
RPM and CFM increase
CFM and RPM decrease
12: A thermometer inside a duct measures ____ heat.
hidden
specific
latent
sensible
13: "E" represents _____ in the Watt's law formula.
watts
voltage
reactance
amperage
14: The leaving chilled water set point for comfort cooling is typically?
45
60
38
66
15: Stop valves shall not be permitted between the system and the
relief valve
condenser
service valve
bleed valve
16: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
32F
70F
58F
77F
17: What's the purpose of a megohmmeter?
To measure low to very low resistance values
To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
To measure very high resistances
None of the above
18: What chemical in the refrigerant set off the leak detection alarm?
Fluorine
Chlorine
Both A and B
none of the above
19: 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.
20: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
splurge
merge
purge
surge
21: How are safety controls wired in a circuit?
Series/parallel
Parallel
Either series or parallel
Series
22: What refrigerant doesn't have to be classified?
R-134A
R-422A
R-717
R-718
23: "I" represents _______ in the Watt's law formula.
reactance
watts
amperage
voltage
24: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
are obsolete.
True
depends on the type of refrigerant being used
False
25: All serviceable components of a refrigeration system shall be provided with
service manuals
name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code