Topics: All categories in the pool
1: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
2: 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?
- 38
- 88
- 58
- 96
3: When an inspection is needed, how often must it be done?
- annually
- every 36 months
- every 18 months
- every 24 months
4: 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
5: The most common type of motor starter is
- delts-wye starter
- across the line starter
- duel-winding starter
- part winding starter
6: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
7: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 10 amps
- 24 amps
- 20 amps
- There isn't enough information to answer.
8: What instrument is used to measure very high resistance?
- ammeter
- voltmeter
- tape measure
- meg ohmmeter
9: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
10: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
11: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Low pressure
- R-414B
- Simple
- Cascade
12: Humidity can be sensed with
- bimetal
- human hair
- pressure bellows
- thermometer
13: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 106 amps
- 1K amps
- 1.6 amps
14: Which of the following controllers would you expect to be most sensitive to temperature changes?
- immersion controller
- low voltage t-stat
- aquastat
- line voltage t-stat
15: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
16: Which refrigerant is lighter than air?
- R-717
- R-123
- R-11
- R-134a
17: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
18: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
19: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent-length of fittings
20: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
21: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- the vapor side of the system
- low side of the system
- the liquid side of the system
22: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
23: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and toxicity
- Weight and color
- Flammability and temperature range
24: Fractionation occurs when
- when a fraction of refrigerant is added as the full charge
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- the pressures decreases as the heat load decreases
- the pressures increase as the heat load increases
25: Gauge pressure is
- Force of pressure above that of atmosphere
- Atmospheric pressure
- Barometric pressure
- Absolute pressrue