Topics: All categories in the pool
1: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Specific heat
- Latent heat
- Enthalpy
- Sensible heat
2: A water regulating valve opens when
- when the power is on
- the head pressure rises
- when the power is on there is an overcharge of refrigerant
- the compressor is on
3: The outer portion of shell of the compressor used on low-pressure chillers is called the
- volute
- baffle
- suction
- nozzle
4: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
5: 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
6: Who authorizes changes to the safety codes?
- Board of Boilers
- Contractor who last serviced the system.
- Person who pulled the permit
- Person in charge of the facility
7: Heat is a form of
- power
- work
- energy
- matter
8: What is used to check very low pressure?
- Velometer
- Hydrometer
- Manometer
- Hygrometer
9: Where is the high-side float located on a chiller system?
- discharge line
- flash line
- inside the chiller barrel
- liquid line
10: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
11: Bubbles in the liquid line sight glass could be caused by
- plugged drier
- bad low pressure switch
- overcharge of oil
- leaking discharge valves in the compressor
12: A start capacitor in series with a start winding will
- decrease the amp draw of the motor
- increase running efficiency
- increase the amp draw of the motor
- increase starting torque
13: Oils, classified as to source, are
- animal, vegetable, and mineral
- naphthalene, paraffin, and castor
- animal, vegetable, and castor
- naphthalene, mixed, and paraffin
14: Which of the following is not an air velocity meter?
- Velometer
- Anemometer
- Anemotherm
- Hydrometer
15: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
16: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
17: Where a refrigeration or air conditioning system is installed,
- A field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressuers
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
18: A chiller entering and leaving temperature difference is?
- 5 degrees F
- 20 degrees F
- 50 degrees F
- 10 degrees F
19: Pipe identification labels are required when the system contains more than
- 65 lbs
- 110 lbs
- 120 lbs
- 55 lbs
20: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
- Primary core, secondary coil, and high and low voltage connectors.
21: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
22: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
23: 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
24: The color code of a tank of ammonia is
- white
- lavender
- light green
- silver
25: Relief valves are rated in
- pounds of air per minute
- pounds of air per hour
- gallons of water per hour
- gallons of water per minute