Topics: All categories in the pool
1: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UM or UL
- UV or UR
- UL and UM
2: All low-pressure chillers use which type of compressor?
- Rotary
- Scroll
- Centrifugal
- Reciprocating
3: On a pumpdown system, the liquid-line solenoid is controlled by the
- thermostat
- low-ambient controller
- low pressure switch
- defrost timer
4: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
5: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- CPR valve
- EEV
- Solenoid valve
- EPR valve
6: "P" represents ______ in the Watt's law formula
- voltage
- watts
- amperage
- reactance
7: 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
- 550
- 100
- 350
8: What is a Category "D" fluid?
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- 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
9: The actual expansion curve of compression follows most nearly which one of the following curves?
- Isothermal
- Volume Temperature
- Pressure Temperature
- Adiabatic
10: Which of the following is an example of an azeotropic refrigerant?
- R-410A
- R-134A
- R-500
- R-404A
11: Ammonia vaporization takes place at what temperature?
- -460F
- -32F
- -110F
- -28F
12: When an inspection is needed, how often must it be done?
- every 18 months
- every 36 months
- annually
- every 24 months
13: Where must a refrigeration contractor's license number be displayed?
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
- Uniforms, checks, and invoices.
14: Heat transferred by conduction from one body to another is done ia:
- gas
- liquid
- solid
- All of the above
15: What must be done to refrigerant pipes before being buried?
- Encased
- Coated
- Certified
- Leaked checked
16: A single pole-double throw switch used how many wires excluding the ground wire?
- five
- three
- four
- two
17: The rupture disc on a low-pressure chiller typically releases pressure at
- 0 psig
- 10 psig
- 5 psig
- 15 psig
18: 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
- 100,000
- 10,000
19: The instrument used to measure the specific gravity of absorption chiller solutions is the
- hydrometer
- Psychrometer
- anemometer
- refractometer
20: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
- Inspector leaves a metal tag with a certification listed on it
21: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- animal, vegetable, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
22: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- the liquid side of the system
- high side of the system
- the vapor side of the system
23: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
24: What pipe can not be used for refrigeration?
- L
- N
- M
- K
25: Can you use Ammonia in industrial applications?
- Yes, always
- When mixed with R-718
- No, never
- Yes, Under certain condidtions