Topics: All categories in the pool
1: The two float-type metering devices are the
- high-side float and the low-side float
- vapor float and the low-side float.
- liquid float and the low-side float
- liquid float and the vapor float
2: A water regulating valve opens when
- when the power is on there is an overcharge of refrigerant
- the head pressure rises
- the compressor is on
- when the power is on
3: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- sensible heat
- tower fans
- evaporation of the water droplets
4: What measures gas pressure?
- Hygrometer
- Manometer
- Hydrometer
- Barometer
5: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 20 uf
- 15 uf
- 25 uf
- 40 uf
6: A Lithium-bromide system is an absorption system that
- uses water as a absorbent and lithium bromide as a refrigerant
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses ammonia as a refrigerant and lithium bromide as an absorbent
7: Pressure is equivalent of
- Force
- Force / Area
- Area X Force
- Force X Area
8: The External equalizer of a TXV compensates for
- pressure within the evaporator
- pressure within the system
- pressure drop across the evaporator coil
- pressure drop across the condenser coil
9: Capacitors are rated in
- volt - amperes
- megaohms
- micro-farads
- kelvins
10: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
11: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
12: If a purge unit fails on a low pressure chiller, what are the symptoms?
- high head pressure
- low suction pressure
- low pressure chillers do not have purge units
- increased capacity
13: When must refrigeration system covered by the code be inspected?
- Annually
- Not required
- Upon installation
- Annually and when installed
14: Volts x amps equals
- Watts
- Inductance
- Ohms Law
- Impedance
15: If the power element on an expansion valve should lose its charge, the valve would
- Under feed
- Over feed
- Close
- Stay open
16: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 110
- 1,000
- 6.6
- 330
17: Where would the EPR valve be located on a multiple evaporator system?
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
- outlet of low temperature evaporator
- outlet of the liquid line
18: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
19: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 1000 watts
- 746 watts
- 600 watts
- 5KW
20: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- 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
21: R-11 has the greatest corrosive effect on
- Magnesium
- Aluminum
- Copper
- Bronze
22: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 100
- 330
- 200
23: A class B2 refrigerant is considered
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
24: A tachometer is an instrument used to measure
- speed
- static pressure
- air velocity
- RPM
25: On a centrifugal compressor, stationary diffuser vanes are needed to
- increase the clearance space
- stop gas flow
- convert velocity energy to pressure
- prevent high pressure on the packing