NYC CUSTODIAN TEST PREP QUESTIONS AND CORRECT ANSWERS LATEST GUIDE 2026/2027 GRADED A+ .

1. 10% Correct answer In high pressure electric generating plants in large buildings, heating the feed water from 70f to 180f with exhauststeam usually will decrease the fuel consumption by... 2. Steam pipe in the room before the pneumatic steam valve Correct answer The direct room radiator with a pneumatically controlled steam heating system is cold, while the adjoining rooms are heated adequately. The first thing you would check in the room is... 3. Inches of vacuum Correct answer The usual vacuum gauge on a steam heating system reads in... 4. Oil pressure Correct answer In a mechanical pressure type burner using no 6 oil heated to 230 f by steam, the oil is atomized by... 5. Shut down the burner when primary air failure occurs Correct answer Avaporstatwithseparatemotor driven oil pump used on a fully automatic heavy oil Brunéi get rotary cup installation is generally used to... 6. Gallons Pumped Correct answer In estimating the amount of work being done by a steam driven water pump, the one of the following items which is usually the most important in the calculation of pump horse power is the ... 7. A rate of flow Correct answer The term fixture unit usually refers to ... 8. The water was too hot Correct answer When pumping water from a return tank, equipped with an automatic make up valve located below the pump, the most probable cause of periodic pump failures to deliver the water would be... 9. Soda acid Correct answer Suppose a small oil fire has broken out in the boiler room in your building, under these circum- stances, the extinguisher least suitable for use is... 10. A large induction motor operating at 60%normal rated capacity Correct answer Ofthe following, a low power factor would most likely result from... 11. Adjust the field of the incoming unit Correct answer Before putting twodc engine generators onthe line in parallel, it is usually necessary to ... 12. Synchronous motor Correct answer Of the following, the best type of AC motor to use for direct connection to a timing device which must be very accurate is a... 13. 200 BTU per minute Correct answer One ton of refrigeration may be expressed most accurately as... 14. Alum is added to water to form a flee before the water reaches the filters Correct answer - Which of the following statements is correct with respect to filtration plants of swimming pools... 15. Limit switch (only active when is running) Correct answer An electric elevator car stalls on the ground floor of a school building. Of the following the item you would least likely to check in your inspection is the B) Floor door switch C) Limit switch D) current to elevator motor 16. A submerged inlet condition may be created resulting in back siphonage Correct answer An examination of the water supply of the sinks of demonstration tables in science rooms reveals the use of rubber hose attachments to sink taps extending below the sink rim. The most criticism of this practice is that ... 17. Automatic resetting of electric clocks throughout the school Correct answer Themodernmultiple circuit program instrument which automatically controls bellsignals in a school usually includes... 18. Electric current Correct answer A solenoid valve is actuated by... 19. Close the automatic damper after the burner goes off and the burner cycle is completed Correct answer A sequential draft control on a rotary cup oil fired boilershould operate to ... 20. Oxygen Correct answer The one component of flue gas that indicates, when present, that more excess air is being supplied than is being used is... 21. Allows non condensable gases to escape Correct answer Advantage of a floatthermostatic steamtrap over a float type type steam trap 22. Inclined manometer Correct answer I