Topics: All categories in the pool
1: Before replacing a seized compressor, the _______ should be determinded.
- cause of seizure
- current draw
- designed head pressure
- type of refrigerant
2: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- mixed occupancy
- institutional occupancy
- public assembly occupancy
3: 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
4: Stop valves shall not be permitted between the system and the
- service valve
- bleed valve
- condenser
- relief valve
5: Lithium-bromide, Li-Br, is best characterized as a
- sugar
- sand
- soil
- salt
6: How many closing forces operate a thermostatic expansion valve?
- 3
- 1
- 2
- 4
7: The evaporator is a device to
- store liquid refrigerant
- absorb heat into the refrigeration system
- Keep the compressor busy
- remove heat from the refrigeration system
8: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- low limit control
- pressure relief device
- zone valve
9: What is NOT a positive displacement compressor.
- Centrifugal
- Rotary
- Scroll
- Reciprocating
10: What section governs pressure vessels?
- Section 1 ASHREA 15 ASME fired
- Section ASHREA 34
- Section 8 ASHREA 15 ASME unfired
- OSHA
11: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Approved by the authorized person
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
12: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
13: A capacitor in series with the start windings will do what?
- Increase starting torque
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating
- Nothing
14: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
15: Heat transferred by conduction from one body to another is done
- via radiation
- via solids
- via heat rays
- via liquids
16: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- splurge
- surge
- merge
- purge
17: How many different groups of refrigerants are there?
- 11
- 7
- 3
- 15
18: On a TXV, the purpose of an external equalizer is to?
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
19: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- the same
- lower
- there is no Group B1 refrigerants
20: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- 2.5 times the design pressure
- the high side
- the aggregate of the high side and low side
- the low side
21: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Stainless steel
- Copper
- Magnesium alloy
22: What is potential measured in?
- Ohms
- Volts
- Amps
- Henrys
23: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 1
- 2
- 3
24: Cooling tower lowers condenser water temp by
- evaporative cooling
- running water thru a secondary heat exchanger
- running fans at 100%
- condensation
25: Booster compressors connect to the ____ side of the compressor
- oil side
- vapor
- low side
- liquid