Centrifugal pump - Study guides, Class notes & Summaries

Seeding of BOD samples is necessary when samples - (All of the above) have a chlorine residual, have a previously been chlorinated, have been subjected to high temperatures, contain high or low pH industrial wastes When is blue-green algae the most dominant on a pond treatment system? - Summer A 30-inch diameter wastewater interceptor is observed to be flowing half-full at about two fps. The approximate volume of wastewater flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 = ...

Wastewater Practice Test (Florida) English Exam Questions And Answers According to FDEP chapter 62-600.440 (4) (b) FAC, basic level disinfection is described as: - ANS A chlorine residual of 0.5 mg/L for 15 minutes at peak hourly flow FDEP chapter 62-604.550 (a) FAC, requires a wastewater spill shall be verbally reported to the state warning point no later than: - ANS 24hrs from discovery What is the 'rule of thumb' regarding pump packing? - ANS Never put rings of new packin...

Becc Test 5 Questions and Correct Answers, Complete Verified Solution, 2024. A fixed volume of liquid is discharged by a centrifugal pump (TRUE/FALSE) False Which centrifugal pump component prevents reverse flowof liquid through the pump? Check valve What is used to move fluid from one location to another? Pump What centrifugal pump component rotates and causes centrifugal force to act on the fluid ? Impeller What centrifugal pump component prevents over heating of the pump? Recircul...

Certificate of Fitness for Citywide Sprinkler Systems (S-12) S-12 CITYWIDE SPRINKLER SYSTEMS, S12 sprinkler test Spring 2023. THE __________ IS RESPONSIBLE TO MAINTAIN SPRINKLER SYS. AND TO DETERMINE QUALIFICATIONS. RECORDS OF ALL INSPECTIONS AND MX SHALL BE MAINTAINED ON PREMISES FOR A MIN. OF __________ YEARS. THE BUILDING OWNER SHALL ASSIGN A(N) ____________ TO COMPLY WITH REQUIREMENTS. REGULAR MX AND MINOR REPAIRS NOT AFFECTING MORE THAN ________ FLOOR(S) ARE CONSIDERED PLANN...

Lost motion in a duplex direct acting boiler feed pump: a. Is necessary b. Should be avoided c. Is due to wear on the tappets and callas. - ANSWER a. Is necessary A scotch marine boiler is: a. Horizontal fire tube boiler b. Vertical fire tube boiler c. Water tube boiler - ANSWER a. Horizontal fire tube boiler Lead is the amount the valve is open when the: a. Crank is on dead center b. Valve is midway on its stroke c. Eccentric is exactly 90 degrees ahead of the crank - ANSWER a. C...

General Maintenance/ Boma Questions and Answers 100% Pass When Starting a centrifugal pump That is part of a manifold with no check valves You should open the suction valve, start the pump and open the discharge valve slowly Curb cock A Valve insert it in a water line between the corporation stop and the water meter is generally called To check sheave wear Measure each groove angle Variable pitch sheaves may be used in some cases to provide which of the following types of speec...

FDNY Z51 RMO Questions and Answers 100%Verified Graded A+ already passed!! the efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a more efficient centrifugal compressor operation results from - correct answer lowering the condenser pressure In most semi hermetic compressors, the suction vapor is used for - correct answer cools the motor The amount of refrigerant that flows through the orifices of an economizer is determined by the - corre...

Seeding of BOD samples is necessary when samples - (All of the above) have a chlorine residual, have a previously been chlorinated, have been subjected to high temperatures, contain high or low pH industrial wastes When is blue-green algae the most dominant on a pond treatment system? - Summer A 30-inch diameter wastewater interceptor is observed to be flowing half-full at about two fps. The approximate volume of wastewater flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 =...

What is the most important factor affecting the useful life of service lines? - Answer It is the ability of the material to resist internal and external corrosion When does Suction Head exist? - Answer Suction head exists when the source of supply is above the centerline of the pump. What is Net positive Suction Head (NPSH) - Answer NPSH is the pressure under which water enters the eye of the impeller in a centrifugal pump. Insufficient NPSH is the main cause of pump cavitation Ex...

Z-51 REFRIGERATION TEST With Correct Solutions 2024 Update Efficiency of the refrigerant cycle is affected by the operations of the condenser. Of the following, a more efficient centrifugal compressor operation results from: - Answer -Lowering the condensing pressure The heat removed from the refrigerant in a condenser is: - Answer -Sensible and latent heat The refrigerant unit that you have been assigned to is being taken out of service for a major repair. You have been assigned to withdr...