Topics: All categories in the pool
1: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 3
- 5
- 2
2: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
- PSIG
- PSIA
3: In a motor, an internal overload might open if
- there's an open start winding
- there was a high pressure refrigerant was used for a low pressure system.
- there's a direct short
- there's an excess current draw through the motor
4: Mercury was used in thermometers primarily because it
- expands uniformly
- was inexpensive
- never freezes
- vaporizes at very high temperatures
5: 1 HP = ____ Watts?
- 3,412
- 3.1416
- 11,239
- 746
6: Which refrigerant is lighter than air?
- R-11
- R-717
- R-134a
- R-123
7: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
8: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Electricity
- Air
- Heat
- Oil
9: 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
10: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
11: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- CFM and HP increase
- CFM and RPM decrease
- RPM and CFM increase
- CFM and HP decrease
12: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Low pressure
- Simple
- Cascade
- R-414B
13: The evaporator is a device to
- store liquid refrigerant
- Keep the compressor busy
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
14: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- self-closing doors
- tight fitting doors
- automatic ventilation
15: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
16: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
17: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
18: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low pressure switch
- low-ambient controller
- thermostat
19: If a purge unit fails on a low pressure chiller, what are the symptoms?
- high head pressure
- low suction pressure
- increased capacity
- low pressure chillers do not have purge units
20: When an inspection is needed, how often must it be done?
- every 36 months
- annually
- every 18 months
- every 24 months
21: The most common type of motor starter is
- part winding starter
- duel-winding starter
- across the line starter
- delts-wye starter
22: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
23: A solder joint melts at temperatures of
- 400F to 800F
- 1,200F to 1,500F
- 600F to 900F
- less than 400F
24: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- red
- blue
- orange
- green
25: Name a reason that does not cause reduced condenser air quantity
- Dirty fan blades
- High ambient temperature
- Prevailing winds
- Dirty Coil