Topics: All categories in the pool
1: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- specific heat
- lost heat
- latent heat
- sensible heat
2: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
3: A chiller entering and leaving temperature difference is?
- 20 degrees F
- 10 degrees F
- 5 degrees F
- 50 degrees F
4: What is Absolute Zero?
- -400F
- -773F
- -640F
- -460F
5: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
6: Sensible heat is the heat added to a substance to
- cause evaporation
- raise its temperature
- change its state
- freeze it
7: The gauge thickness required on a CO2 tank construction is
- 3/32"
- 1/8"
- 1/16"
- 5/16"
8: NH3 is
- ammonia
- R-508A
- lithium bromide
- R-718
9: An air conditioning system rated for 36,000 BTU's is equivalent to
- three tons of cooling
- one ton of cooling
- two tons of cooling
- 12,000 tons of cooling
10: A movie theater would be considered a
- public assembly occupancy
- mixed occupancy
- commercial occupancy
- institutional occupancy
11: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 80%
- 90%
- 100%
12: Excessive head pressure is often caused by
- leaking reed valve on the discharge side
- air cooled condenser is plugged
- insufficient refrigerant
- thermostat set too high
13: When energized, a normally open relay will be
- open
- closed
- noisy
- depends on the type and class of the relay
14: In a motor, an internal overload might open if
- there's a direct short
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
- there's an excess current draw through the motor
15: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
16: What is the refrigerant chlorodifluoromethane?
- R-22
- R-134a
- R-123
- R-12
17: 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
18: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -40F to 0F
- 0F-38F
- -100F to -40F
- 30F to 50F
19: A split-phase motor has a ______ winding and a ____ winding
- run, start
- run, common
- duel-run, duel-start
- start, common
20: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-12
- R-22
- R-113
21: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the aggregate of the high side and low side
- the high side
- 2.5 times the design pressure
22: Who approves containers for refrigerants?
- D.O.E
- D.O.D
- D.O.T
- E.P.A
23: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
24: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and friction head
- GPM and unbalanced head and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
25: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above