Question 345Steam Plants - Assistant Engineer

70% to pass

The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the _______________.

Aspeed of the impeller
Bimpeller ratio of the pump
Cfeed water vapor pressure
Dpump capacity in gpm
AI Explanation

The correct answer is C) feed water vapor pressure. The net positive suction head (NPSH) of a boiler centrifugal feed pump should be calculated over and above the feed water vapor pressure. This is because the NPSH represents the minimum pressure required at the pump inlet to prevent cavitation, which can occur when the pressure drops below the feed water vapor pressure. Calculating the NPSH in this manner ensures that the pump operates safely and efficiently, preventing damage and maintaining proper boiler operation. The other answer choices are incorrect because they do not directly relate to the critical factor of feed water vapor pressure in determining the required NPSH for the pump.

Related Questions
Q@q.QuestionNumber:Most auxiliary turbines do not require an external source of gland sealing steam... Q@q.QuestionNumber:Most marine boilers are designed to produce _______________. Q@q.QuestionNumber:A turbo-generator back pressure trip can be actuated as a result of ____________... Q@q.QuestionNumber:Which of the following statements represents the function of insulating brick? ... Q@q.QuestionNumber:Which of the listed problems will happen when the water level of a fire-tube typ...

Ready to test your knowledge?

Take a Steam Plants - Assistant Engineer Practice Exam
Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App