Which of these are common approaches to pump performance regulations?, Throttle control, By-pass Control, Speed control, All of the above, VSD adjusts pump speeds, flow rate and pressure based on system's demands, False, True, Most common voltage for 3phase motors operating 50Hz or 60Hz frequency in Malaysia is, 230 V & 280V, 230V & 400V, 280V & 576V, 380 V & 460V, Soft-starters are not classified as types of VSD systems for speed control, False, True, Impeller trimming is a good alternative to reduction of power consumption for a pump while providing a less expensive solution, however, once the diameter has been reduced it can never be enlarged again., False, True.

Q2

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