Topics: All categories in the pool
1: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 40% Li-Br, 60% distilled water
- 40% Li-Br, 60% tap water
- 60% Li-Br, 40% distilled water
- 50% Li-Br, 50% tap water
2: Which occupancy can ammonia be used in?
- depends on the quantity of freon
- redifential
- industrial
- commercial
3: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
4: Capacitors are rated in
- micro-farads
- volt - amperes
- kelvins
- megaohms
5: The equivalent length of pipe in a water piping system is
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it
6: Bubbles in the liquid line sight glass could be caused by
- plugged drier
- bad low pressure switch
- overcharge of oil
- leaking discharge valves in the compressor
7: What is the refrigerant dichlorodifluoromethane?
- R-22
- R-12
- R-123
- R-134A
8: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 208v
- 277v
- 240v
- 120v
9: Crankcase heaters are energized
- to prevent compressor freeze-up
- when the compressor is off
- while the compressor is running
- to allow easy compressor start-up
10: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
11: A professional or office building would be considered what type of occupancy?
- business
- public assembly
- commercial
- mercantile
12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 550 lbs
- 330 lbs.
- 660 lbs
13: The generator shell contains the
- condenser, the evaporator, and the generator
- evaporator and the absorber
- condenser and the absorber
- condenser and the generator
14: The principle used in continuous type absorption systems is
- Dalton's Law
- Boyle's Law
- Charles's Law
- Ohm's Law
15: What does an anemometer measure?
- voltage
- velocity
- temperature
- amperage
16: The instrument used to measure the specific gravity of absorption chiller solutions is the
- refractometer
- anemometer
- Psychrometer
- hydrometer
17: How many CFMs are required per square foot of commercial office occupied space
- .5 CFM
- 20 CFM
- 5 CFM
- 15 CFM
18: When must refrigeration system covered by the code be inspected?
- Annually
- Not required
- Upon installation
- Annually and when installed
19: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the high side
- the aggregate of the high side and low side
- 2.5 times the design pressure
20: The heat picked up in the evaporator must equal to
- the heat giving by the condenser
- the heat lost by the medium being cooled
- the heat gained by the condenser
- the heat of compression
21: Sensible heat is the heat added to a substance to
- cause evaporation
- change its state
- raise its temperature
- freeze it
22: A class A3 refrigerant is considered
- non-toxic but highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
23: Heat is a form of
- matter
- work
- energy
- power
24: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
25: In an electrical circuit, what is potential measured in?
- Ohms
- Volts
- Herys
- Amps