Topics: All categories in the pool
1: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the system
- pressure drop across the evaporator coil
- pressure within the evaporator
2: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Fusible plug
- Rupture disk
- Glove valve
3: R-123 belongs to Group
- B-3
- B-2
- A-3
- B-1
4: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
5: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- upper chamber of the low side
- lower chamber of the low side
- lower chamber of the high side
6: How many flammability classifications are refrigerants in?
- 7
- 2
- 5
- 3
7: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
8: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
9: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person in charge of the facility
- Board of Boilers
- Person who pulled the permit
10: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- decreases
- run as designed with low ambient controls
- doesn't change
11: What is considered a cooling agent?
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat without condensation
12: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
13: Class T machine room
- 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
- shall include closets used for setting equipment
14: The first step in mechanical refrigeration is
- evaporation
- condensation
- expansion
- compression
15: R-12 is
- dichlorofluoromethane
- dichlorodifluoromethane
- dichloromethane
- trichlorofluoromethane
16: Gauge pressure is
- force of pressure above that of atmospheric
- atmospheric pressure
- absolute pressure
- what a gauge reads when checking pressures on a chilled water system.
17: A start capacitor in series with a start winding will
- decrease the amp draw of the motor
- increase starting torque
- increase the amp draw of the motor
- increase running efficiency
18: A solder joint melts at temperatures of
- less than 400F
- 400F to 800F
- 1,200F to 1,500F
- 600F to 900F
19: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- low side of the system
- the liquid side of the system
- the vapor side of the system
20: Adjusting the spring pressure on a TXV
- changes superheat
- makes no difference
- adjusts the bulb charge
- changes subcooling
21: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and core
- Contacts, secondary coil, and core
22: How are safety controls wired in a circuit?
- Either series or parallel
- Series
- Series/parallel
- Parallel
23: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
24: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
25: 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
- run voltage
- lift voltage
- boost voltage
- pick-up voltage