FDNY Final Exam 2024

FDNY Final Exam 2024

1. what is the main purpose of the Kingsbury thrust?: counteract the forces acting parallel to the compressor's shaft ( preventing action displacement) 2. capacitors have the ability to ?: store electrical energy that can be used to start motors 3. what is the purpose of the gland seal system: prevent steam from leaking out of the turbine or air from leaking in 4. how should the seat of a service valve be positioned when a permanent pressure gauge has been installed: Cracked off of the back seat 5. which of the following will cause the atmospheric valve to open?: high steam condenser pressure 6. A chilled water system is producing cooling with 3 compressors. As the load on the system increase, a fourth compressor is cycled on. which of the following changes takes place?: reduction in chilled water temperature 7. according to the ASHRE Standard, which of the following describes how the discharge of a pressure relieve valve of fusible plug must be installed?: 15 feet above the ground level and not less than 20 feet from any window ventilation opening or exit in any building. 8. how is the water level in the hot well regulated ?: Combined operation of a recirculation valve and overboard valve 9. which of the following cause the suction compressor valve to open?: Evap- orator pressure 10. according to the ANSI and the ASHRE standard which of the following safety group designation would be consider the most toxic and the most flammable: B3 11. where would you find an accumulator?: between the evaporator and com- pressor 12. a particular refrigeration uses a room thermostat which has been wired to a liquid line solenoid valve. it is noted that when the room thermostat is satisfy, the liquid line solenoid closes the room temperature continues to go down. this is due to?: Pumping down of the low side 13. a particular refrigeration system uses a room thermostat which has been wire to a liquid line solenoid valve . it is noticed when the room thermostat is satisfy, the liquid line solenoid loses but the room temperature continues to go down: an oil luggage low side 14. which device is used to control the capacity if a reciprocating compressor suction service valve: suction service valve 15. what device records the speed of the turbines shaft: tachometer 16. which of the following best describes the emergency overspeed trip valve?: butterfly valve 17. if the windings of a motor become loose and touch the body of the motor ,what is likely to happen: Rmo will be in charge of shock hazard 18. what is the purpose of the auxiliary oil pump: Insure adequate lubrication during startup and shutdown 19. what device is used to stop a turbine when it exceeds its maximum RPM?- : overspeed trip valve 20. which of the following correctly lists the events that takes place during a compressors suction stroke: re-expansion of HPV suction valve opens, and draw vapor into the cylinder 21. machine room safety standards have been established by: ASHRE 15 22. Normally closed solenoid valve are not used with systems that has?: 4 way switching valve 23. a smoke detector within the discharge side of a 2500 cfm air distribution system , if the smoke detector is activated , what should be done immediate- ly?: the associated fan should be automatically stopped