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 cause the condenser to sweat
- it would make the condenser less efficient
- it would make the condenser more efficient
2: By using nitrogen within a pipe during brazing operation,
- Discoloration is prevented
- Copper oxide formation is prevented
- The explosion hazard is confined
- Exterior scale formation is minimized
3: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
4: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- low suction pressure
- high head pressure
- increased capacity
5: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
6: All serviceable components of a refrigeration system shall be provided with
- safe access
- service manuals
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
7: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-1
- A-2
- B-2
- B-1
8: A start capacitor is wired in _____ with the start windings.
- series
- series-parallel
- parallel
- junction
9: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
10: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
11: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's water
- Because it's cheap
- Because it's a non-flammable refrigerant
12: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
13: A self contained system
- is a unit system Group II refrigerants only
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a complete factory made and tested system
- is a unit system Group I refrigerants only
14: The equivalent length of pipe in a water piping system is
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it plus 25% for fittigns
15: "R" represents ___ in the Ohm's law formula
- amperage
- resistance
- capacitance
- voltage
16: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
17: 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
- 1,000
- 100
- 10,000
18: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- gate or globe valves
- companion or block valves
- king valves
- ball valves
19: A High-Probability 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 will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
20: How many flammability classifications are refrigerants in?
- 7
- 2
- 3
- 5
21: A Lithium-bromide system is an absorption system that
- uses water as a absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
22: What section of ASHRAE-15 governs pressure vessels?
- Section 7 ASHRAE-15 ASME VIII fired
- Section 9 ASHRAE-15 ASME VIII unfired
- OSHA
- Section 6 ASHRAE-34 ASME VIII unfired
23: A hotel is considered a _______ occupancy.
- institutional
- residential
- commercial
- mercantile
24: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and castor
- animal, vegetable, and mineral
25: The difference between saturated liquid and saturated vapor is
- pressure
- heat
- temperature
- volume