Topics: All categories in the pool
1: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
2: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
3: The leaving chilled water set point for comfort cooling is typically?
- 60
- 38
- 45
- 66
4: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
- Never can be allowed
- Approved by the installing contractor
5: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- the vapor side of the system
- low side of the system
- the liquid side of the system
6: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- The company who installed the system must notify the fire department in the jurisdiction where installed
- the form or certificate shall be authorized by the Department of Public Safety
7: 1 HP = ____ Watts?
- 746
- 3.1416
- 11,239
- 3,412
8: How are a compressor and condenser fan wired?
- parallel
- parallel-series
- series
- series-parallel
9: The outer portion of shell of the compressor used on low-pressure chillers is called the
- volute
- suction
- nozzle
- baffle
10: What is the boiling point of refrigerant governed by?
- Compressor RPM's
- P&T relationship
- Evaporator temperature
- Condenser sub-cooling
11: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Pressure induced displacement.
- Positive displacement
- Non-positive displacement
- Low Pressure displacement
12: A class B1 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
- toxic but non-flammable
13: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- animal, vegetable, and castor
14: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
15: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 100
- 10,000
16: Liquid level gauges must be provided with what?
- Automatic shut-offs
- A relief valve
- A low level mark
- A red line
17: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 50
- 100
- 550
- 350
18: 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
19: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
20: One ton of refrigeration is defined as ______ btu/minute.
- 60
- 12,000
- 200
- 720,000
21: Ammonia vaporization takes place at what temperature?
- -460F
- -32F
- -28F
- -110F
22: How many gallons of water do you need per pound of ammonia?
- 10
- 1
- 50
- 100
23: Heat transferred by conduction from one body to another is done
- via liquids
- via radiation
- via heat rays
- via solids
24: Increasing superheat will do what to your system?
- Nothing
- Increase liquid flow
- Increase gas flow
- Decrease liquid flow
25: 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