Topics: All categories in the pool
1: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UM or UL
- UV or UR
- UL and UR
- UL and UM
2: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- animal, vegetable, and castor
3: How many closing forces operate a thermostatic expansion valve?
- 2
- 1
- 3
- 4
4: If your suction line is warmer than the room temperature, this may indicate
- an over charge
- below normal superheat
- a low charge
- plugged air filter
5: What type refrigerant is NOT ozone depleting?
- CFC
- HFC
- Halon
- HCFC
6: The two float-type metering devices are the
- high-side float and the low-side float
- liquid float and the low-side float
- liquid float and the vapor float
- vapor float and the low-side float.
7: The difference between saturated liquid and saturated vapor is
- heat
- temperature
- volume
- pressure
8: A motor starter contains a thermal overload and a
- contactor
- solenoid
- transformer
- 3-way relay
9: Liquid level gauges must be provided with what?
- A red line
- A low level mark
- A relief valve
- Automatic shut-offs
10: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Glove valve
- Fusible plug
- Rupture disk
11: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
12: How are refrigerant blends classified?
- Based on the oil used
- Based on worst case fractionation
- Blends don't have to be classified
- Based on best case Fractionation
13: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
- Contractor who last serviced the system.
14: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
15: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
16: 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
17: In an electrical circuit, what is potential measured in?
- Volts
- Herys
- Ohms
- Amps
18: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
19: A mercury bulb controller is not recommended for
- use where vibration is severe
- low voltage use
- line or low voltage use
- line voltage use
20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 55 lbs
- 550 lbs
- 330 lbs.
21: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 8'4"
- 9.00'
- 7.00'
- 7.25'
22: R-12 is
- trichlorofluoromethane
- dichlorofluoromethane
- dichloromethane
- dichlorodifluoromethane
23: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
24: Capacity control on an absorption system is typically accomplished by varying the
- speed of the condenser water circulator pump
- pressure setting on the system's rupture disc
- rate at which heat is supplied to the generator
- speed of the chilled water circulatory pump
25: R-22 falls under which safety classification?
- B-2
- A-2
- B-1
- A-1