Topics: All categories in the pool
1: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would have no effect on the condenser
- it would make the condenser less efficient
- it would make the condenser more efficient
- it would cause the condenser to sweat
2: Suction valve unloaders afford an effective means of
- superheat control
- refrigerant control
- capacity control
- evaporator control
3: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or less
4: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- leak checked
- moisture barrier
- insulated
5: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the outdoors
- the return air ducted system
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
6: "E" references ____ in the Ohm's law formula
- amperage
- voltage
- capacitance
- resistance
7: 746 watts is equal to
- 1 hp
- 10 hp
- Pi
- 100 hp
8: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- absorbed solution
- weak solution
- strong solution
- concentrated solution
9: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
10: The solution that leaves the concentrator in an absorption chiller is referred to as the
- weak solution
- diluted solution
- strong solution
- absorbed solution
11: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
12: What is a Category "D" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
13: What is a Category "M" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
14: Where must a refrigeration contractor's license number be displayed?
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
15: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
16: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
17: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 600 watts
- 1000 watts
- 5KW
- 746 watts
18: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
19: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
20: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Critical temperature
- Dry bulb temperature
- Saturated temperature
- Wet bulb temperature
21: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
22: A rule of thumb in air conditioning is ____ CFM per ton?
- 500
- 100
- 600
- 400
23: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 970
- 212
- 180
24: What is R-22?
- HFC
- Chlorodifluoromethane
- CCFCM
- Chlorofluoromethane
25: The color code of a tank of ammonia is
- white
- lavender
- light green
- silver