Topics: All categories in the pool
1: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
2: Which winding have the most turns?
- depends on the motor phase
- run
- they have equal amount of turns
- Start
3: B3 refrigerants are considered
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
4: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
5: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- PVC
- Magnesium alloy
- Copper
6: By using nitrogen within a pipe during brazing operation,
- Copper oxide formation is prevented
- Discoloration is prevented
- Exterior scale formation is minimized
- The explosion hazard is confined
7: 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
8: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
9: When energized, a normally open relay will be
- noisy
- depends on the type and class of the relay
- open
- closed
10: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 365 psig
- 327 psig
- 255 psig
- 125 psig
11: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- decreases
- run as designed with low ambient controls
- doesn't change
12: Increasing superheat will do what to your frost line?
- Nothing
- Increasae
- Could either increase or decrease depending on the load conditions
- Decrease
13: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
14: How are safety controls wired in a circuit?
- Parallel
- Series/parallel
- Either series or parallel
- Series
15: 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
16: What would be the classification for Stop & Shop grocery store?
- Industrial
- Instituional
- Place of assembly
- Large mercantile
17: What is used to check very low air pressures in air conditioning duct?
- Barometer
- Anemomter
- Vacuum gauge
- Manometer
18: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
19: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class B machinery room
- Class M machinery room
- Class A machinery room
- Class T machinery room
20: Refrigerants shall be classified by
- maximum permissible quantities of each group
- toxicity and flammability
- color codes
- requirements for commercial, industrial, and residential occupancies
21: What type of copper is not permitted on refrigeration systems?
- Type K
- Type M
- Type N
- Type L
22: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 55 lbs
- 330 lbs.
- 550 lbs
23: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Moisture and air
- Water and soap
- Oil and water
24: What device should be used on low-temperature freezers?
- discharge muffler
- oil separator
- hot-gas by-pass
- high capacity TXV
25: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above