Topics: All categories in the pool
1: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- service manuals
- manufactures instructions on start-up procedures
- safe access
2: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- black iron
- magnesium
3: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low pressure switch
- low-ambient controller
- thermostat
4: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
5: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- it shall not be operated below prescribed pressures
- the form of certificate shall be authorized by the Department of Pubic safety
6: The rupture disc on a low-pressure chiller typically releases pressure at
- 10 psig
- 15 psig
- 5 psig
- 0 psig
7: In a system designed for sub-zero ambient temperatures, what must be added?
- Low-ambient kit
- Infrared dye for leak identification
- Nitrogen
- Booster compressor
8: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- Yes, always
- No, never
9: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will foam
- oil will thicken
- oil level will rise
10: Ammonia (NH3) is a group III refrigerant
- True
- False
11: A restaurant is classified as a
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- large mercantile occupancy
12: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 200 psig
- 1000 psig
- 600 psig
13: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 6.6 lbs
- 44 lbs
- 13.9 lbs
14: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
15: On cooling towers, what causes the condenser water to drop
- tower fans
- ambient temperatures
- sensible heat
- evaporation of the water droplets
16: A Lithium-bromide system is an absorption system that
- uses water as a refrigerant and lithium bromide as an absorbent
- 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
17: How are safety controls wired in a circuit?
- Either series or parallel
- Series/parallel
- Series
- Parallel
18: Which is considered the more efficient condenser?
- fan cooled
- air cooled
- water cooled
- spray cooled
19: High pressure controls should be set no higher than
- 10% of set point
- 80% of set point
- 90% of set point
- 25% of set point
20: At higher altitudes, the boiling point of refrigerant is
- lower
- equal to the coefficient of water at 32F
- the same
- higher
21: What is considered a cooling agent?
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
22: A rule of thumb in air conditioning is ____ CFM per ton?
- 400
- 600
- 100
- 500
23: What section governs pressure vessels?
- OSHA
- Section 8 ASHREA 15 ASME unfired
- Section ASHREA 34
- Section 1 ASHREA 15 ASME fired
24: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- sensible heat
- lost heat
- specific heat
- latent heat
25: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a fusible plug