Topics: All categories in the pool
1: 1 Watt = ______ BTU's?
- 3.412
- 12
- 7.216
- 4.482
2: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 15
- 18
- 24
- 10
3: R-11 belongs to Group
- A-2
- A-1
- B-3
- B-1
4: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and friction head
5: Which is the lowest vacuum?
- 5" hg
- 1,000 Microns
- 5 psig
- 10 psia
6: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
7: What type of copper is not permitted on refrigeration systems?
- Type M
- Type K
- Type L
- Type N
8: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the high side
- upper chamber of the low side
- lower chamber of the high side
9: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
10: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
11: Stop valves shall not be permitted between the system and the
- service valve
- relief valve
- condenser
- bleed valve
12: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 18
- 33
- 50
- 22
13: R-22 falls under which safety classification?
- A-1
- B-2
- A-2
- B-1
14: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
15: What measures gas pressure?
- Manometer
- Hydrometer
- Barometer
- Hygrometer
16: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
17: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- decreases
- run as designed with low ambient controls
- doesn't change
- increases
18: R-11 has the greatest corrosive effect on
- Copper
- Magnesium
- Aluminum
- Bronze
19: What is the boiling point of refrigerant governed by?
- Condenser sub-cooling
- Compressor RPM's
- P&T relationship
- Evaporator temperature
20: A single pole-double throw switch used how many wires excluding the ground wire?
- three
- five
- two
- four
21: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the evaporator
- pressure within the system
- pressure drop across the evaporator coil
22: A hissing noise at the expansion valve is a good indication that
- gas is passing thru it
- liquid is passing thru it
- expansion valve is oversized
- nothing is passing thru
23: 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
- 2.5 times the design pressure
- the high side
24: Low pressure systems have what kind of compressor?
- Scroll
- Centrifugal
- Rotary
- Reciprocating
25: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system