Topics: All categories in the pool
1: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 257 psig, 77 psig
- 226 psig, 68 psig
- 365 psig, 120 psig
- 455 psig, 185 psig.
2: A split-phase motor has a ______ winding and a ____ winding
- start, common
- run, start
- run, common
- duel-run, duel-start
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: Machinery rooms must be vented to ______?
- unoccupied spaces
- neutralizing tank
- basement
- outdoors
5: What would be the classification of a church?
- Large mercantile
- Industrial
- Place of assembly
- Institutional
6: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
7: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- commercial occupancy
- illegal occupancy
- public assembly occupancy
- institutional occupancy
8: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 24
- 75
- 50
- 100
9: Total heat of a substance is considered
- enthalpy
- sensible heat
- empathetical
- specific heat
10: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
11: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
12: How many forces operate a thermostatic expansion valve?
- 4
- 3
- 1
- 2
13: How many BTU's is produced by one watt of energy
- 3.41
- 2.57
- 1
- 3.00
14: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 34.15
- 6.830
- 3.415
- 16.64
15: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
16: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 40'
- At least 30'
- At least 20'
- There is no minimum for relief valve and windows.
17: How many square inches per square foot?
- 144
- 24
- 98
- 64
18: How much refrigerant can be stored in a mechanical room outside of the system?
- 100
- 330
- 200
- 150
19: What pipe can not be used for refrigeration?
- L
- M
- N
- K
20: Mercury was used in thermometers primarily because it
- never freezes
- was inexpensive
- expands uniformly
- vaporizes at very high temperatures
21: Which occupancy can ammonia be used in?
- industrial
- depends on the quantity of freon
- commercial
- redifential
22: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 255 psig
- 365 psig
- 125 psig
- 327 psig
23: What is the maximum voltage range allowed on an electrical circuit?
- 20%
- 10%
- 15%
- 5%
24: What would be the classification of a prison?
- Place of assembly
- Industrial
- Institutional
- Large mercantile
25: 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