Topics: All categories in the pool
1: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class A machinery room
- Class T machinery room
- Class B machinery room
- Class M machinery room
2: Which of the following is an example of an azeotropic refrigerant?
- R-404A
- R-500
- R-410A
- R-134A
3: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
4: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 30F to 50F
- -100F to -40F
- -40F to 0F
- 0F-38F
5: A restaurant is classified as a
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
- mixed occupancy
6: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
7: What is R-22?
- Chlorofluoromethane
- HFC
- Chlorodifluoromethane
- CCFCM
8: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
9: A rule of thumb in air conditioning is ____ CFM per ton?
- 600
- 100
- 400
- 500
10: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 1 week
- 30 days
- 2 months
- 14 days
11: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 240 volts
- 2,400 volts
- 2.40 volts
- 24.0 volts
12: What type of copper is not permitted on refrigeration systems?
- Type M
- Type L
- Type N
- Type K
13: How many square inches per square foot?
- 64
- 24
- 98
- 144
14: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
15: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or more
- 3 cubic feet or less
- 15 cubic feet or more
- 15 square feet or less
16: How many gallons of water per pound of ammonia do you need?
- 20
- 15
- 5
- 1
17: Low ambient controls are used when
- on air conditioning systems only
- when systems run all year round
- economizers are used
- always
18: A start capacitor in series with a start winding will
- increase the amp draw of the motor
- decrease the amp draw of the motor
- increase running efficiency
- increase starting torque
19: Which creates more of a heat load?
- 50% RH
- 30% RH
- 70% RH
- 90% RH
20: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
21: How many groups of refrigerants are there?
- 3
- 5
- 1
- 7
22: A hotel is considered a _______ occupancy.
- commercial
- institutional
- residential
- mercantile
23: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, aligned, fire door
- Self-closing, approved, fire door
- Self-closing, wooden, fire door
24: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low pressure switch
- thermostat
- low-ambient controller
25: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 80
- 100
- 90
- 110