Question 123Steam Plants - QMED
70% to passMost auxiliary turbine feed pumps do not require an external source of gland sealing steam because they _______________.
Aoperate at relatively low pressures
Boperate with only a small amount of axial thrust
Cutilize carbon packing rings at the low pressure end
Dexhaust to pressures above atmospheric pressure
AI Explanation
The correct answer is D) exhaust to pressures above atmospheric pressure. Auxiliary turbine feed pumps typically do not require an external source of gland sealing steam because they exhaust to pressures above atmospheric pressure. This means the pressure at the pump's exhaust is high enough to provide the necessary sealing force, eliminating the need for additional gland sealing steam. The other options are incorrect because: A) operating at relatively low pressures does not inherently eliminate the need for gland sealing steam, B) the amount of axial thrust is not the primary factor, and C) the use of carbon packing rings is not the reason these pumps do not require external gland sealing steam.
Related Questions
Q169:If the water level in a steaming boiler is dropping rapidly and cannot be kept a... Q145:While a vessel is underway, which of the conditions listed would indicate a leak... Q135:The auxiliary exhaust system shown in the illustration can be supplied by steam ... Q73:The atmospheric drain tank (ADT) normally drains to the _______________. Q80:Which of the labeled items within the illustrated steam drum represents the mean...
Ready to test your knowledge?
Take a Steam Plants - QMED Practice ExamOfficial Resources