Topics: All categories in the pool
1: 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
2: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- tower fans
- sensible heat
- evaporation of the water droplets
3: "R" represents ___ in the Ohm's law formula
- voltage
- resistance
- amperage
- capacitance
4: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- zone valve
- low limit control
- pressure relief device
5: What is considered a cooling agent?
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
6: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would have no effect on the condenser
- it would cause the condenser to sweat
- it would make the condenser less efficient
- it would make the condenser more efficient
7: A pressure relief should be located at least _______ from windows and doors.
- 30'
- 20'
- 25'
- 15'
8: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
9: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
10: R-123 belongs to Group
- B-3
- B-1
- A-3
- B-2
11: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
12: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- PSIG
- PSIA
- Pounds of air per minute.
13: Lithium-bromide, Li-Br, is best characterized as a
- sugar
- soil
- sand
- salt
14: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
15: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 200
- 330
- 100
16: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
17: Where is an EPR valve located on a multi-evaporator system?
- Suction line prior to the accumulator of the lowest temperature system
- Suction line at the compressor
- Suction line of the warmest evaporator
- Suction line of the coolest evaporator
18: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
19: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
20: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
- Temperature range and hazardousness
21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-113
- R-12
- R-22
- R-11
22: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1.2
- 1
- 1.5
23: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Stainless steel
- Copper
24: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- splurge
- merge
- purge
- surge
25: How many closing forces operate a thermostatic expansion valve?
- 2
- 1
- 3
- 4