Acentrifugal pump running at 500 rpm and at its maximum efficiency it is delivering a head of 30 m at a flow rate of 60 litres per minute if the rpm is changed to 1000, determine the head h in metres and flow rate q in litres per minute at maximum efficiency

What is the chief metrological difference between measuring with a microscope and with an electronic comparator? a. the microscope is limited to small workpieces. a. the microscope is limited to small workpieces. c. the comparator can only examine one point on the workpiece. d. the microscope carries its own standard.