Topics: All categories in the pool
1: Pressure is equivalent of
- Force
- Area X Force
- Force X Area
- Force / Area
2: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Muffler
- Foot valve
- Stop valve
- Moisture indicator
3: What section of ASHRAE-15 governs pressure vessels?
- Section 7 ASHRAE-15 ASME VIII fired
- Section 9 ASHRAE-15 ASME VIII unfired
- OSHA
- Section 6 ASHRAE-34 ASME VIII unfired
4: Where must a refrigeration contractor's license number be displayed?
- Trucks, license plates, and uniforms
- Uniforms, checks, and invoices.
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
5: What refrigerant were phased out in 2004?
- R-11
- R-12
- R-134a
- R-22
6: A micron is
- one thousandths of a millimeter
- one millonths of a micrometer
- a larger unit of measurement than Hg
- one millonths of a centimeter
7: E = I X R is
- Amps Law
- Impedance Law
- Ohms Law
- Watts Law
8: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- outlet of low temperature evaporator
- outlet of the liquid line
- inlet of the low temperature evaporator.
9: On a TXV, the purpose of an external equalizer is to?
- Increase the pressure on the top of the power head diaphragm
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
- balance the evaporator load
10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 660 lbs
- 500 lbs
11: Give an example of a secondary coolant?
- R-718
- R-12
- R-410A
- R-717
12: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
13: On a centrifugal compressor, stationary diffuser vanes are needed to
- increase the clearance space
- prevent high pressure on the packing
- convert velocity energy to pressure
- stop gas flow
14: What measures gas pressure?
- Manometer
- Hydrometer
- Barometer
- Hygrometer
15: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- PSIG
- Pounds of air per minute.
- PSIA
16: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- absolute pressure
- atmospheric pressure
- force of pressure above that of atmospheric
17: R-123 belongs to Group
- B-2
- B-3
- A-3
- B-1
18: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
19: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- 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
20: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type switch that stops the compressor when the pressure on the high side becomes too high
21: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the evaporator
- pressure within the system
- pressure drop across the evaporator coil
22: Low-side system leaks in a low-pressure chiller will often result in
- nitrogen leaking out of the system.
- air being pulled into the system
- system refrigerant leaking from the system
- water being pulled into the system
23: Booster compressors connect to the ____ side of the compressor
- vapor
- liquid
- oil side
- low side
24: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- .9776 watts
- 977.6 watts
- 9.776 watts
- 9,776 watts
25: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and toxicity
- Flammability and temperature range
- Weight and color