Topics: All categories in the pool
1: Humidity can be sensed with
- bimetal
- thermometer
- human hair
- pressure bellows
2: Which creates more of a heat load?
- 90% RH
- 30% RH
- 70% RH
- 50% RH
3: What is the purpose of a surge capacitor on a contactor?
- to protect low voltage equipment
- to keep the contactor pulled in
- to balance the sine waves
- to provide smoother start/stops
4: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
5: Ammonia vaporization takes place at what temperature?
- -32F
- -460F
- -110F
- -28F
6: Most CFC's are
- inert but toxic
- flammable
- toxic
- inert
7: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 20 amps
- 24 amps
- 10 amps
- There isn't enough information to answer.
8: What is not a requirement of a class T machine room?
- tight fitting doors
- self-closing doors
- automatic ventilation
- fire hose connection to the building fire protection system
9: What is the maximum voltage range allowed on an electrical circuit?
- 10%
- 15%
- 20%
- 5%
10: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- outside the machinery room
- evaporator
- compressor
11: Stop valves shall not be permitted between the system and the
- bleed valve
- relief valve
- condenser
- service valve
12: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
13: Watt's Law indicates Volts X Amps = _________.
- Current
- Watts
- Resistance
- Ohms
14: How many refrigerant classifications are there for flammability?
- 1
- 7
- 2
- 3
15: The instrument used to measure the specific gravity of absorption chiller solutions is the
- refractometer
- Psychrometer
- hydrometer
- anemometer
16: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
17: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 13.9 lbs
- 6.6 lbs
- 44 lbs
18: 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
- boost voltage
- pick up voltage
- run voltage
- lift voltage
19: E = I X R is
- Watts Law
- Ohms Law
- Amps Law
- Impedance Law
20: Increasing superheat will do what to your frost line?
- Could either increase or decrease depending on the load conditions
- Nothing
- Increasae
- Decrease
21: Low pressure chiller systems use what type of compressor?
- Centrifugal
- Scroll
- Screw
- Reciprocating
22: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
23: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 58F
- 77F
- 70F
- 32F
24: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 80%
- 90%
- 75%
25: 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
- 10,000
- 100
- 1,000