Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A start capacitor in series with a start winding will
increase starting torque
decrease the amp draw of the motor
increase running efficiency
increase the amp draw of the motor
2: Electricity involves the movement of electrons in atoms
True
False
3: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
it would cause the condenser to sweat
it would make the condenser less efficient
it would make the condenser more efficient
it would have no effect on the condenser
4: Halo-carbon refrigerants cannot be used with what material?
Stainless Steel
Magnesium alloy
Aluminum
Copper
5: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
Moisture indicator
Foot valve
Stop valve
Muffler
6: Thermodynamics is the branch of science that deals with
state of energy
molecular therory
heat energy
energy due to motion
7: What is the refrigerant dichlorodifluoromethane?
R-123
R-22
R-12
R-134A
8: Heat cannot of itself, pass from a
cold to a warmer body
warm to a colder body
state of hot energy to a state of cold energy
None of the above
9: A relief valve shall be located at least ___ above grade.
10'
25'
15'
36'
10: How many opening forces operate a thermostatic expansion valve?
2
4
3
1
11: A 3-cubic foot receiver must have what type of relief valve?
fusible plug
relief valve
rupture device
none of the above
12: The purpose of an accumulator is to
filter out impurities from the system
assure no liquid returns to the compressor
reduce friction loss to the flow of refrigerant
store excess refrigerant from the reciver
13: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
False
depends on the type of refrigerant being used
True
are obsolete.
14: Ammonia (NH3) is a group III refrigerant
True
False
15: Which of the following most closely represents the concentration of Li-Br in a absorption system?
60% Li-Br, 40% distilled water
50% Li-Br, 50% tap water
40% Li-Br, 60% tap water
40% Li-Br, 60% distilled water
16: To determine the pump size needed for an open cooling tower system, the following must be known,
GPM, pipe size, and equivalent head.
GPM and friction head
GPM and balanced head and friction head
GPM and unbalanced head and friction head
17: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
Water and soap
Moisture and air
Air and dirt
Oil and water
18: What does an anemometer measure?
voltage
temperature
velocity
amperage
19: Which is considered the more efficient condenser?
water cooled
spray cooled
fan cooled
air cooled
20: Which winding have the most turns?
run
depends on the motor phase
Start
they have equal amount of turns
21: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
144 BTU
12,000 BTU
24,000 BTU
970 BTU
22: An example of direct system is
rooftop unit
chiller
absorber
none of the above
23: Gauge pressure is
Force of pressure above that of atmosphere
Absolute pressrue
Barometric pressure
Atmospheric pressure
24: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
Temperature limiter device
Relief valve
Circuit Breaker
T&P device
25: Copper and its alloys shall not be used with ammonia