Topics: All categories in the pool
1: 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
2: 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
- 455 psig, 185 psig.
- 226 psig, 68 psig
- 365 psig, 120 psig
- 257 psig, 77 psig
3: A professional or office building would be considered what type of occupancy?
- mercantile
- public assembly
- commercial
- business
4: On a single phase motor, when does the start winding cut out?
- At 75% of its full rated speed
- At 25% of its full rated speed
- At 50% of its full rated speed
- Start windings do no cut-out of the run cycle
5: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
6: Brazed joints melt at temperatures above
- 800F
- 1,200F
- 500F
- 1,000F
7: Cooling tower lowers condenser water temp by
- running water thru a secondary heat exchanger
- condensation
- running fans at 100%
- evaporative cooling
8: The discharge relief valve is located (9.4.6)
- between the compressor and the stop valve
- on top of the condensor
- between the compressor and oil separator
- between the compressor and reciever
9: Ammonia belongs to Group
- A-2
- B-1
- A-1
- B-2
10: Machinery rooms must be vented to ______?
- basement
- outdoors
- unoccupied spaces
- neutralizing tank
11: 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
12: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
13: Ammonia can come in contact with _______ ?
- Aluminum
- Brass
- Copper
- Copper tubing
14: A mercury bulb controller is not recommended for
- use where vibration is severe
- low voltage use
- line or low voltage use
- line voltage use
15: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
16: Which is the lowest vacuum?
- 5 psig
- 10 psia
- 5" hg
- 1,000 Microns
17: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- design pressure
- low pressure
- critical pressure
18: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
19: When an electronic bridge is in balance the bridge output will be
- 15 volts
- 1 volt
- .01 volts
- 0 volts
20: What is used to check very low pressure?
- Velometer
- Hydrometer
- Hygrometer
- Manometer
21: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there is a space 6' or more above it
- When there are sprinklers above
- When its white
- When it's used as part of a supply or return air system
22: A halide torch is most useful with a freon compression system
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
- to release a sticking valve
- to detect refrigeration leaks in piping joints
23: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Nesting scrolls
- Rotating vanes
- Fan-like action
- Suction and discharge valves
24: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- shall use fusible plugs
25: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will cool excessively as the solution crystallizes.
- The machine will cool excessively as the solution evaporates
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize