Topics: All categories in the pool
1: A split-phase motor has a ______ winding and a ____ winding
- run, start
- run, common
- start, common
- duel-run, duel-start
2: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
3: Which winding have the most turns?
- they have equal amount of turns
- depends on the motor phase
- run
- Start
4: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- A-2
- B-1
5: 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
6: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- specific heat
- sensible heat
- lost heat
- latent heat
7: A self contained system
- is a unit system Group II refrigerants only
- is a unit system Group I refrigerants only
- is a complete factory made and tested system
- is any system or part of a system used to increase evaporation by expansion or vaporization
8: 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
9: The best way to detect ammonia in brine is
- carbonation of soda
- potassium of line
- CO2 gas
- nessler regaent
10: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 5KW
- 746 watts
- 600 watts
- 1000 watts
11: What is the maximum voltage range allowed on an electrical circuit?
- 15%
- 10%
- 20%
- 5%
12: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Foot valve
- Muffler
- Moisture indicator
- Stop valve
13: Cooling tower lowers condenser water temp by
- running water thru a secondary heat exchanger
- running fans at 100%
- condensation
- evaporative cooling
14: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- high head pressure
- increased capacity
- low suction pressure
15: Mercury was used in thermometers primarily because it
- never freezes
- expands uniformly
- vaporizes at very high temperatures
- was inexpensive
16: A hissing noise at the expansion valve is a good indication that
- expansion valve is oversized
- gas is passing thru it
- nothing is passing thru
- liquid is passing thru it
17: The actual expansion curve of compressor follows most nearly which one of the following
- Adiabatic
- Isothermal
- Pressure-Temperature
- Volume
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: When energized, a normally open relay will be
- depends on the type and class of the relay
- open
- noisy
- closed
20: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Magnesium
- Nickel
- Zinc
- Copper
21: "I" represents ____ in the Ohm's law formula.
- capacitance
- amperage
- resistance
- voltage.
22: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and unbalanced head and friction head
- GPM and friction head
23: One ton of refrigeration is defined as ______ btu/minute.
- 60
- 12,000
- 200
- 720,000
24: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
25: When 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 pressures
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.