Topics: All categories in the pool
1: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the system
- pressure within the evaporator
- pressure drop across the evaporator coil
2: A mercury bulb controller is not recommended for
- use where vibration is severe
- low voltage use
- line or low voltage use
- line voltage use
3: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
4: If two 500 ohm resistors are connected in series, the resistance will be
- 500 ohms
- 200 ohms
- 1000 ohms
- 20 ohms
5: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 2
- 3
- 1
- 5
6: A thermometer inside a duct measures ____ heat.
- sensible
- hidden
- latent
- specific
7: Where would the EPR valve be located on a multiple evaporator system?
- inlet of the low temperature evaporator.
- outlet of the liquid line
- outlet of low temperature evaporator
- outlet of high temperature evaporator
8: 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
9: What is used to check very low pressure?
- Hydrometer
- Manometer
- Hygrometer
- Velometer
10: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
- Contractor who last serviced the system.
11: One atmosphere equals
- 0 psia
- 29.4
- 14.7
- 0 psig
12: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
13: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
14: The freezing point of water at sea level is?
- 32F
- -10C
- 32C
- 0F
15: When an electronic bridge is in balance the bridge output will be
- 0 volts
- 15 volts
- 1 volt
- .01 volts
16: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Tight fitting doors
- Automatic ventilation
- Self-closing doors
17: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
18: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
19: Class A refrigerants are considered
- non-toxic
- flammable
- non-flammable
- toxic
20: Ammonia is under what safety classification?
- B1
- B3
- A3
- B2
21: A EPR valve is installed on what type of evaporators?
- high-temperature evaporators
- low-temperature evaporators
- plate evaporators
- shell and tube evaporators
22: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Manometer
- Barometer
- Anemomter
23: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- A group sensing
- phosgene gas sening
- CO Sensing
24: Low-side system leaks in a low-pressure chiller will often result in
- system refrigerant leaking from the system
- nitrogen leaking out of the system.
- air being pulled into the system
- water being pulled into the system
25: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used