Topics: All categories in the pool
1: A start capacitor is wired in _____ with the start windings.
- series
- series-parallel
- junction
- parallel
2: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 5 amps
- 20 amps
- 15 amps
- 10 amps
3: Which is considered the more efficient condenser?
- fan cooled
- air cooled
- water cooled
- spray cooled
4: Stop valves shall not be permitted between the system and the
- condenser
- relief valve
- bleed valve
- service valve
5: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- .1
- 1.7
- .8
- 1.2
6: The low pressure oil safety switch
- must be reset manually
- resets itself after the time delay has terminated
- never trips
- resets itself automatically
7: How many refrigerant classifications are there for flammability?
- 1
- 3
- 7
- 2
8: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
9: Humidity can be sensed with
- thermometer
- pressure bellows
- bimetal
- human hair
10: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- black iron
- magnesium
11: 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
12: Which oil is hydoscopic?
- polyolester
- animal
- SW30
- mineral
13: one BTU equals
- 31.4 hp
- 3.41 hp
- Pi
- 12,000 hp
14: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
15: How is bring measured?
- manometer
- anemometer
- hydrometer
- hygrometer
16: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Pressure induced displacement.
- Positive displacement
- Low Pressure displacement
- Non-positive displacement
17: On a single phase motor, when does the start winding cut out?
- 25% of its RLA speed
- 50% of its RLA speed
- 75% of its RLA speed
- 100% of its RLA speed
18: If two 500 ohm resistors are connected in series, the resistance will be
- 200 ohms
- 20 ohms
- 1000 ohms
- 500 ohms
19: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
20: Liquid level gauges must be provided with what?
- Automatic shut-offs
- A relief valve
- A red line
- A low level mark
21: Relief valves are rated in
- gallons of water per hour
- pounds of air per hour
- gallons of water per minute
- pounds of air per minute
22: R-717 is
- carbon dioxide
- water
- trichloromethane
- ammonia
23: One ton of refrigeration is defined as ______ btu/minute.
- 200
- 720,000
- 12,000
- 60
24: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 25' above grade
- At least 20' above grade
25: Increasing superheat will do what to your frost line?
- Increasae
- Nothing
- Could either increase or decrease depending on the load conditions
- Decrease