Topics: All categories in the pool
1: Capacitors are rated in
- megaohms
- micro-farads
- volt - amperes
- kelvins
2: What is a Category "D" fluid?
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
3: What type of material can't be used on the outlet of a relief valve?
- PVC
- Copper
- Stainless steel
- Magnesium alloy
4: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- shall not be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
5: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
6: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- HCFC-123
- Lithium bromide
- CFC-11
- ammonia
7: On a pumpdown system, the liquid-line solenoid is controlled by the
- low-ambient controller
- low pressure switch
- thermostat
- defrost timer
8: Halo-carbon refrigerants cannot be used with what material?
- Stainless Steel
- Magnesium alloy
- Aluminum
- Copper
9: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
10: NH3 is
- R-718
- lithium bromide
- R-508A
- ammonia
11: What kind of material can't be used on the outlet of a relief valve?
- Copper
- PVC
- Stainless Steel
- Aluminum
12: While the system is operating, the discharge line should be
- 10-15F warmer than ambient
- room temperature
- too hot to hold by hand
- at the same temperature as the crankcase
13: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- 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 failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
14: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 700F
- 1000F
- 600F
15: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- low pressure
- design pressure
- critical pressure
16: The most common type of motor starter is
- delts-wye starter
- duel-winding starter
- part winding starter
- across the line starter
17: A relief valve shall be located at least ___ above grade.
- 10'
- 25'
- 15'
- 36'
18: The heat picked up in the evaporator must equal to
- the heat giving by the condenser
- the heat gained by the condenser
- the heat of compression
- the heat lost by the medium being cooled
19: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 20 amps
- 24 amps
- 10 amps
20: The absorber shell contains the
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
- evaporator and the absorber
21: What refrigerant were phased out in 2004?
- R-134a
- R-12
- R-22
- R-11
22: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
23: R-11 has the greatest corrosive effect on
- Copper
- Aluminum
- Magnesium
- Bronze
24: Which is considered the more efficient condenser?
- water cooled
- spray cooled
- fan cooled
- air cooled
25: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above