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
- red
- green
2: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Fusible plug
- Gate valve
- Glove valve
3: Relief valves are rated in
- gallons of water per hour
- pounds of air per minute
- gallons of water per minute
- pounds of air per hour
4: "E" represents _____ in the Watt's law formula.
- voltage
- watts
- reactance
- amperage
5: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- B-1
- A-2
6: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
7: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Approved by the authorized person
- Approved by the installing contractor
- Only when combustion air is provided from outside of the machinery room
8: What is R-22?
- Chlorofluoromethane
- HFC
- CCFCM
- Chlorodifluoromethane
9: An oil pressure safety switch should be set at
- 5 to 10 psi below low side pressure
- 5 to 10 psi above low side pressure
- 10 to 15 psi below low side pressure
- 10-15 psi above low side pressure
10: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Air
- Oil
- Heat
- Electricity
11: How many square inches per square foot?
- 64
- 98
- 144
- 24
12: A solder joint melts at temperatures of
- 600F to 900F
- 400F to 800F
- 1,200F to 1,500F
- less than 400F
13: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 18"
- 12"
- 36"
14: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
15: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
16: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- specific heat
- lost heat
- sensible heat
- latent heat
17: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- T&P device
- Circuit Breaker
- Relief valve
- Temperature limiter device
18: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- printed circuit board (PCB)
- duel-voltage switch
- motor starter
- centrifugal switch
19: Viscosity is
- the coefficient of external friction
- the ability of oil to flow
- measure of weight
- a measure of heat content
20: Stop valves shall not be permitted between the system and the
- bleed valve
- relief valve
- condenser
- service valve
21: Electricity involves the movement of electrons in atoms
- True
- False
22: What is the minimum size wire you can use on a 30 amp circuit?
- 14 AWG
- 16 AWG
- 12 AWG
- 10 AWG
23: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 116
- 38
- 88
- 108
24: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 100
- 330
- 200
25: Which creates more of a heat load?
- 30% RH
- 70% RH
- 50% RH
- 90% RH