Topics: All categories in the pool
1: Stop valves shall not be permitted between the system and the
- service valve
- relief valve
- bleed valve
- condenser
2: 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
3: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
4: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
5: Ammonia (NH3) is a group III refrigerant
- True
- False
6: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 50
- 25
- 22
7: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- any decrease in pressure will cause condensation
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
8: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
9: Name a reason that does not cause reduced condenser air quantity
- Dirty fan blades
- Prevailing winds
- High ambient temperature
- Dirty Coil
10: 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
- pick-up voltage
- boost voltage
- run voltage
- lift voltage
11: Relief valves are rated in
- gallons of water per hour
- gallons of water per minute
- pounds of air per minute
- pounds of air per hour
12: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -100F to -40F
- -40F to 0F
- 30F to 50F
- 0F-38F
13: Viscosity is
- the ability of oil to flow
- a measure of heat content
- the coefficient of external friction
- measure of weight
14: Liquid level gauges must be provided with what?
- A relief valve
- A low level mark
- Automatic shut-offs
- A red line
15: Ohm's Law indicates Amps X Resistance = ___________.
- Current
- Ohms
- Impedance
- Volts
16: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
17: Which is considered the more efficient condenser?
- fan cooled
- air cooled
- spray cooled
- water cooled
18: What is an egress?
- An escape route
- A code violation
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
19: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UL and UM
- UM or UL
- UV or UR
20: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- duel-voltage switch
- centrifugal switch
- printed circuit board (PCB)
- motor starter
21: In an A/C unit, dirty filters will cause
- low suction pressure
- high suction pressur
- low oil pressure
- high discharge pressure
22: Low-side system leaks in a low-pressure chiller will often result in
- air being pulled into the system
- water being pulled into the system
- system refrigerant leaking from the system
- nitrogen leaking out of the system.
23: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 16.64
- 3.415
- 6.830
- 34.15
24: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- institutional occupancy
- commercial occupancy
- mixed occupancy
25: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above