Topics: All categories in the pool
1: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
2: A single pole-double throw switch used how many wires excluding the ground wire?
- three
- four
- five
- two
3: Control systems can be classified by
- economy of operation
- source of power
- tonnage of system
- safety
4: What is considered a cooling agent?
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat without vaporization
5: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class B machinery room
- Class M machinery room
- Class T machinery room
- Class A machinery room
6: Which occupancy can ammonia be used in?
- redifential
- industrial
- depends on the quantity of freon
- commercial
7: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Foot valve
- Stop valve
- Muffler
- Moisture indicator
8: Setting a pressure relief device shall not exceed ___ of the design pressure
- 100%
- 80%
- 75%
- 90%
9: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- annually
- quarterly
- bi-annually
- regularly
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: A class B1 refrigerant is considered
- non-toxic and non-flammable
- toxic but non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
12: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
13: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
14: If your suction line is warmer than the room temperature, this may indicate
- a low charge
- an over charge
- plugged air filter
- below normal superheat
15: 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
16: An electronic bridge circuit is basically a
- high voltage circuit
- 24 volt control circuit
- Wheatstone
- suspension
17: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will thicken
- oil level will rise
- oil will foam
18: In an electrical circuit, what is potential measured in?
- Herys
- Volts
- Amps
- Ohms
19: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- .5 CFM
- 20 CFM
- 5 CFM
20: Heat transferred by conduction from one body to another is done
- via liquids
- via solids
- via radiation
- via heat rays
21: On a pumpdown system, the liquid-line solenoid is controlled by the
- low-ambient controller
- low pressure switch
- defrost timer
- thermostat
22: 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
23: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
24: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- sensible heat
- specific heat
- lost heat
- latent heat
25: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UV or UR
- UL and UM
- UM or UL
- UL and UR