Help with the exam questions from the first day of 2010
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Regarding the multiple-choice questions in the exam on the first day of 2010, please discuss the correct answers. 61. Which of the following statements regarding the design requirements for the installation of pump systems are incorrect? A. Both centrifugal pumps and reciprocating pumps require a safety margin to be considered in terms of their ultimate effective net positive suction head. B. The installation height of pump equipment must meet two basic requirements: the piping layout should be reasonable to facilitate operational tasks, and it should also satisfy the hydraulic requirements of the system. C. The installation height of a centrifugal pump must ensure that it can operate without cavitation under specified conditions. D. To ensure proper operation of a centrifugal pump without cavitation, the net positive suction head must be less than a certain specified minimum value; this value is known as the NPSHr required by the pump
A and D, I’m not too sure either
Reply to 1# lrn20061221: The answer is A and D. For reciprocating pumps, it is not necessary to take into account a safety margin regarding the ultimate effective net positive suction head. In order to ensure the proper operation of a centrifugal pump without cavitation, the net positive suction head must be greater than a specified minimum value; this value is known as the NPSHr required by the pump.