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

• True
• False