Topics: All categories in the pool
1: A split-phase motor has a ______ winding and a ____ winding
- start, common
- run, start
- duel-run, duel-start
- run, common
2: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- far apart or greater difference
- a ling psychrometer doesn't have two theremometers.
- 2F difference
- nearly the same
3: 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
- lift voltage
- run voltage
- boost voltage
- pick-up voltage
4: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
5: A run capacitor is wired in series with the _____ windings.
- run
- start
- start capacitor
- common
6: What would be the classification for Stop & Shop grocery store?
- Instituional
- Large mercantile
- Place of assembly
- Industrial
7: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Never can be allowed
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
8: If two 500 ohm resistors are connected in series, the resistance will be
- 20 ohms
- 1000 ohms
- 200 ohms
- 500 ohms
9: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- release the charge when the pressure exceeds 310 psig or higher
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
- Pumpdown procedures are not allowed with systems containing liquid recievers
10: Class T machine room
- shall include closets used for setting equipment
- shall have remote controls to stop the action of the refrigerant compressor
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
11: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
12: How many closing forces operate a thermostatic expansion valve?
- 3
- 4
- 2
- 1
13: A self contained system
- is a unit system Group II refrigerants only
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a complete factory made and tested system
- is a unit system Group I refrigerants only
14: The certificate of inspection
- shall be posted and protected from dirt, water, and other elements
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
- shall be authorized by a notarized insurance company
15: When an electronic bridge is in balance the bridge output will be
- 15 volts
- 0 volts
- 1 volt
- .01 volts
16: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 5/16"
- 1/8"
- 3/32"
17: Sublimation occurs when
- liquid is formed from a gas
- ice melts and turns to water
- gas is formed from a liquid
- gas is formed directly from a solid
18: In an A/C unit, dirty filters will cause
- low oil pressure
- high discharge pressure
- low suction pressure
- high suction pressur
19: 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
20: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Oil
- Electricity
- Heat
- Air
21: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Dry bulb temperature
- Wet bulb temperature
- Critical temperature
- Saturated temperature
22: The color code of a tank of ammonia is
- silver
- light green
- lavender
- white
23: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- the liquid side of the system
- the vapor side of the system
- high side of the system
24: Control systems can be classified by
- safety
- source of power
- economy of operation
- tonnage of system
25: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 9.00'
- 7.25'
- 8'4"
- 7.00'