47A) A centrifugal pump is operating normally in a closed cooling water system. If system pressure is increased by 10 psi, the available net positive suction head (NPSH) for the pump will __________; and the pump mass flow rate will __________. (Assume the water density does not change and the minimum required NPSH for the pump is maintained.)

A. increase; increase

B. increase; remain the same

C. decrease; decrease

D. decrease; remain the same

ANSWER: B.Can you please guidance and evidence why the answer is B

47B) A centrifugal water pump is operating normally with the following parameters:

Inlet water pressure = 15 psia Water temperature = 100F Pump head added = 100 feet

What is the pump discharge pressure?

A. 43 psia

B. 58 psia

C. 100 psia

D. 115 psia

ANSWER: B.

Can you please guidance and evidence why the answer is B