Topics: All categories in the pool
1: B3 refrigerants are considered
- toxic and highly flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic but non-flammable
2: A micron is
- a larger unit of measurement than Hg
- one millonths of a micrometer
- one thousandths of a millimeter
- one millonths of a centimeter
3: The generator shell contains the
- condenser and the generator
- condenser, the evaporator, and the generator
- condenser and the absorber
- evaporator and the absorber
4: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- toxic and non-flammable
5: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 25
- 22
- 66
- 50
6: A secondary coolant is defined as
- any refrigerant direcly in contact with the cooling space for process cooling
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
7: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 88
- 58
- 96
- 38
8: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- release the charge when the pressure exceeds 310 psig or higher
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
- Pumpdown procedures are not allowed with systems containing liquid recievers
9: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
10: Transformers are rated in
- volts
- volts-ohms
- amps
- volt-amps
11: 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.
- 7.25'
- 8'4"
- 9.00'
- 7.00'
12: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
13: A VRF system is a direct system
- true
- false
14: What instrument is used to measure very high resistance?
- tape measure
- ammeter
- meg ohmmeter
- voltmeter
15: Oils, classified as to source, are
- naphthalene, mixed, and paraffin
- naphthalene, paraffin, and castor
- animal, vegetable, and mineral
- animal, vegetable, and castor
16: The Department that certifies the transportation of refrigerant is the
- RSES
- EPO
- EPA
- DOT
17: On a pumpdown system, the liquid-line solenoid is controlled by the
- thermostat
- defrost timer
- low pressure switch
- low-ambient controller
18: What type refrigerant is NOT ozone depleting?
- HFC
- HCFC
- CFC
- Halon
19: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- boost voltage
- lift voltage
- pick up voltage
- run voltage
20: The leaving chilled water set point for comfort cooling is typically?
- 45
- 38
- 66
- 60
21: Where is the high-side float located on a chiller system?
- flash line
- liquid line
- inside the chiller barrel
- discharge line
22: How are a compressor and condenser fan wired?
- parallel-series
- series-parallel
- parallel
- series
23: 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
- 110
- 100
- 90
24: The rupture disc on a low-pressure chiller typically releases pressure at
- 10 psig
- 0 psig
- 15 psig
- 5 psig
25: The actual expansion curve of compressor follows most nearly which one of the following
- Pressure-Temperature
- Adiabatic
- Volume
- Isothermal