Topics: All categories in the pool
1: What device measures the specific gravity of a substance?
- Manometer
- Hygrometer
- Thermometer
- Hydrometer
2: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
3: In a horizontal shell & tube condenser, the ammonia is liquefied by
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
- water sprayed over condenser
- removing the latent heat of vaporization
4: Excessive head pressure is often caused by
- leaking reed valve on the discharge side
- insufficient refrigerant
- air cooled condenser is plugged
- thermostat set too high
5: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- explosion precautions must be taken
- the owner shall be informed
- no flames shall be permitted
- gas masks must be worn
6: Watt's Law indicates Volts X Amps = _________.
- Watts
- Ohms
- Resistance
- Current
7: 1 HP = ____ Watts?
- 11,239
- 3,412
- 746
- 3.1416
8: A capacitor in series with the start windings will do what?
- Decrease the RLA to within 10% of its rating
- Nothing
- Increase starting torque
- Increase run efficiency by 10% of its rating
9: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 155F
- 158F
- 32F
- 45F
10: What is the leaving chilled water set point for water chiller systems?
- 45F
- 66F
- 55F
- 38F
11: A start capacitor in series with a start winding will
- increase running efficiency
- increase the amp draw of the motor
- decrease the amp draw of the motor
- increase starting torque
12: The best way to detect ammonia in brine is
- carbonation of soda
- CO2 gas
- nessler regaent
- potassium of line
13: 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
14: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 66.1 psig
- 70.8 psig
- 43.3 psig
- 50.2 psig
15: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
16: How many refrigerant classifications are there for flammability?
- 3
- 2
- 1
- 7
17: How is bring measured?
- manometer
- hygrometer
- anemometer
- hydrometer
18: The best way to determine the voltage requirement for an electrical component is to
- read the nameplate data
- read the voltage with a mulitmeter
- check with the utility company
- determine the capacity of the service panel
19: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 600F
- 700F
- 1000F
20: Suction valve unloaders afford an effective means of
- capacity control
- evaporator control
- superheat control
- refrigerant control
21: Which of the following is NOT a positive displacement compressor?
- scroll
- screw
- reciprocating
- centrifugal
22: Ammonia (NH3) is a group III refrigerant
- True
- False
23: The low pressure oil safety switch
- resets itself after the time delay has terminated
- must be reset manually
- resets itself automatically
- never trips
24: Give an example of a secondary coolant?
- R-410A
- R-717
- R-718
- R-12
25: The difference between saturated liquid and saturated vapor is
- pressure
- volume
- heat
- temperature