Topics: All categories in the pool
1: The color code of a tank of ammonia is
- white
- light green
- lavender
- silver
2: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- higher
- lower
- the same
3: What pipe can not be used for refrigeration?
- M
- L
- N
- K
4: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- absorbed solution
- concentrated solution
- weak solution
5: If the power element on an expansion valve should lose its charge, the valve would
- Close
- Under feed
- Over feed
- Stay open
6: Sensible heat is the heat added to a substance to
- cause evaporation
- change its state
- raise its temperature
- freeze it
7: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system less than 1,000 lbs
8: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
9: A halide torch is most useful with a freon compression system
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
- to release a sticking valve
- to sweat flanges on the refrigeration piping
10: Increasing superheat will do what to your system?
- Decrease liquid flow
- Increase gas flow
- Increase liquid flow
- Nothing
11: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 30F to 50F
- 0F-38F
- -100F to -40F
- -40F to 0F
12: 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
- lift voltage
- pick up voltage
- boost voltage
- run voltage
13: A Low-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
14: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 500 lbs
- 660 lbs
- 330 lbs
15: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
16: Capacity control on an absorption system is typically accomplished by varying the
- rate at which heat is supplied to the generator
- pressure setting on the system's rupture disc
- speed of the condenser water circulator pump
- speed of the chilled water circulatory pump
17: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- Ceiling height
- 72"
- 7.25'
18: "I" represents _______ in the Watt's law formula.
- amperage
- watts
- reactance
- voltage
19: 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
20: If the spring is adjusted to increase the superheat, this new setting will
- allow more liquid into the evaporator
- have no effect on the frost line
- shorten the frost line
- lengthen the frost line
21: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 75
- 50
- 100
- 24
22: The absorber shell contains the
- evaporator and the absorber
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
23: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
24: The density of a gas refers to
- pounds per absolute pressure
- cubic feet per pound
- pounds per cubic foot
- pounds per square foot
25: Pressure is equivalent of
- Force X Area
- Area X Force
- Force / Area
- Force