Topics: All categories in the pool
1: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- blue
- orange
- green
- red
2: The discharge relief valve is located (9.4.6)
- between the compressor and reciever
- between the compressor and oil separator
- on top of the condensor
- between the compressor and the stop valve
3: A motor starter contains a thermal overload and a
- solenoid
- transformer
- 3-way relay
- contactor
4: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
5: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 90%
- 75%
- 80%
6: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
7: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat lost by the medium being cooled
- the heat of compression
- the heat giving by the condenser
8: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such 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
9: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
10: What refrigerant doesn't have to be classified?
- R-134A
- R-422A
- R-718
- R-717
11: High pressure controls should be set no higher than
- 25% of set point
- 90% of set point
- 80% of set point
- 10% of set point
12: The certificate of inspection
- shall be posted on the compressor shell or electrical panel at the unit
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted and protected from dirt, water, and other elements
13: Where must a refrigeration contractor's license number be displayed?
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
- Truck, office, every job, and on all equipment
14: Excessive head pressure is often caused by
- leaking reed valve on the discharge side
- insufficient refrigerant
- thermostat set too high
- air cooled condenser is plugged
15: 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
16: The proper location for an oil separator is between the
- receiver and metering device
- condenser and receiver
- evaporator and compressor
- compressor and condenser
17: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and friction head
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
18: Capacitors are rated in
- micro-farads
- volt - amperes
- megaohms
- kelvins
19: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
20: What is the purpose of a surge capacitor on a contactor?
- to balance the sine waves
- to keep the contactor pulled in
- to protect low voltage equipment
- to provide smoother start/stops
21: R-22 falls under which safety classification?
- A-1
- B-1
- A-2
- B-2
22: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
23: At higher altitudes, the boiling point of refrigerant is
- the same
- higher
- lower
- equal to the coefficient of water at 32F
24: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
25: The evaporator is a device to
- store liquid refrigerant
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
- Keep the compressor busy