Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: How many gallons of water do you need per pound of ammonia?
1
50
10
100
2: The two basic types of evaporators are
prime surface and finned
flooded and direct expansion
direct expansion and plate
finned and plate
3: The main cause of enacting the "no vending rule" of July 1st 1992 was
global warming potential
ozone depletion
both a & b
None of the above
4: Control systems can be classified by
tonnage of system
safety
economy of operation
source of power
5: Pressure vessels having an inside diameter of 6” or less shall be protected by
a fusible plug
a pressure relief device
either a fusible plug or a pressure relief device
Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
6: Where is the high-side float located on a chiller system?
discharge line
liquid line
inside the chiller barrel
flash line
7: How many BTU's is produced by one watt of energy
1
2.57
3.41
3.00
8: What pipe can not be used for refrigeration?
K
N
L
M
9: Who is permitted to access a refrigeration machine room?
Contractors only
Anyone, it's a completely safe area
Authorized persons only
Any employee
10: The amount of heat required to raise the temperature of 1 lb of water 1F is?
The rate of conduction
1 BTU
1 Kelvin
1 Therm
11: Name an HCFC refrigerant(s):
R-22
R-123
R-11
both a & b
12: When an inspection is needed, how often must it be done?
every 24 months
every 18 months
every 36 months
annually
13: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
100
90
80
110
14: 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
pick up voltage
run voltage
lift voltage
15: Who authorizes changes to the safety codes?
Person in charge of the facility
Person who pulled the permit
Contractor who last serviced the system.
Board of Boilers
16: Which winding have the most turns?
they have equal amount of turns
Start
run
depends on the motor phase
17: Give an example of a secondary coolant?
R-718
R-717
R-12
R-410A
18: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
far apart or greater difference
2F difference
nearly the same
a ling psychrometer doesn't have two theremometers.
19: Oils, classified as to source, are
naphthalene, mixed, and paraffin
animal, vegetable, and castor
animal, vegetable, and mineral
naphthalene, paraffin, and castor
20: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
Pressure gauge
Temperature gauge
Sight glass gauge
All of the above
21: A Category D fluid
is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
is when the design pressure does not exceed 150 psi
a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
Both a and b are correct
22: By using nitrogen within a pipe during brazing operation,
Discoloration is prevented
Copper oxide formation is prevented
Exterior scale formation is minimized
The explosion hazard is confined
23: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
100,000
10,000
1,000
100
24: What is the refrigerant chlorodifluoromethane?
R-123
R-12
R-134a
R-22
25: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the