Question 1: The insertion of straightening vanes in the straight run of pipe that is available ________________ from the orifice plate can be used to obtain reasonably accurate metering with a _____________ length of straight pipe, in a run where the recommended length of pipe cannot not be used. A - upstream, longer B - downstream, shorter C - downstream, longer D - upstream, shorter _______________________________________________
Question 2: In theory, vena contracta taps provide the most accurate measurements. The vena contracta is the: A - Point of greatest turbulence B - Point of maximum pressure C - Point of minimum pressure D - Point of minimum temperature _______________________________________________
Question 3: Flange taps are the most widely used means of measuring differential pressure across an orifice plate. The taps are placed within the orifice mounting flanges, exactly: A - 0.254 m upstream and downstream of the respective faces of the plate B - 2.54 mm upstream and downstream of the respective faces of the plate C - 254 mm upstream and downstream of the respective faces of the plate D - 25.4 mm upstream and downstream of the respective faces of the plate _______________________________________________
Question 4: Liquid flow pressure connection should be made at the __________________ of the line and the sensing lines sloped __________________ the transmitter to allow accumulated gas to migrate back into the pipe. A - Top, away from B - Side, toward C - Top, toward D - Bottom, away from _______________________________________________
Question 5: If the recommended length of pipe cannot be provided upstream of the orifice plate, straightening vanes may be used to: A - Reduce swirl or vortices in the flow B - Decrease the beta ratio and the severity of the flow disturbance C - Avoid errors caused by elevation changes D - Increase swirl or vortices in the flow _______________________________________________
Question 6: Bevelled orifice plates must always be installed with: A - The flat side upstream and the bevelled side downstream B - The face of the flange extended beyond the end of the pipe C - The flat side downstream and the bevelled side upstream D - A recess between the end of the pipe and orifice plate _______________________________________________
Question 7: The type of differential pressure connection (tap) that is designed to measure the greatest pressure differential in the flow run is: A - Flange taps B - Vena contracta taps C - Pipe taps D - Corner taps _______________________________________________
Question 8: Prior to operating the orifice plate changer, it should be: A - Dismantled and thoroughly cleaned B - Pressure tested C - Lubricated through the grease fitting D - All of the above _______________________________________________
Question 9: A slide valve plate changer allows for the: A - Changing or removal of orifice plates without shutting down or opening the flow line B - Orifice plates to be cleaned more regularly C - Changing of orifice plates without shutting down plant production D - All of the above _______________________________________________
Question 10:
___________ flow pressure connections should be made at the _________________of the line so that sediment and condensate will not enter the transmitter sensing lines. A - Vapour, bottom or at the side B - Gas, top or at the side C - Liquid, top or bottom D - Steam, bottom _______________________________________________
Question 11:
Of the types of pressure connections discussed, the only connection that may be made at the top or at the side of the line is a: A - Liquid flow pressure connection B - Vena contracta tap C - Steam or other vapour flow pressure connection D - Gas flow pressure connection _______________________________________________ Question 12: The type of differential pressure connection (tap) that is used for pipe sizes less than 50mm (2in.) nominal pipe diameter with low beta ratios is: A - Pipe taps B - Corner taps C - Flange taps D - Vena contracta taps _______________________________________________
Question 13:
__________________ flow pressure connections should be made at the __________________ of the line. A - Steam, side B - Gas, bottom or the side C - Liquid, top D - Steam, bottom _______________________________________________
Question 14: The type of differential pressure connection (tap) that is used to measure the permanent pressure loss that results whenever a fluid flows through a restriction is: A - Corner taps B - Pipe taps C - Vena contracta taps D - Flange taps _______________________________________________
Question 15: To install an orifice plate with an orifice plate changer, the first step is to depressurize the upper chamber by opening the bleed valve. A - False B - True _______________________________________________
Question 16: Orifice plates: A - should be cleaned with a suitable solvent. B - must be clamped so that the orifice bore is concentric with the pipe. C - should have the upstream side of the handle marked ?inlet?. D - All of the above _______________________________________________
Question 17: Fluid should enter the orifice plate with a fully developed velocity profile, free of vortices to allow for: A - increased beta ratio and flow disturbance B - the elimination of "rattle" in the pipes C - the highest degree of measurement accuracy D - the installation of straightening vanes _______________________________________________
Question 18: If the orifice plate is greasy, it should be cleaned using sandpaper or emery. A - True B - False _______________________________________________
Question 19: Both types of straightening vanes (fin-type and flanged-type tubular vane) are bolted or welded to the pipe to allow for: A - The thickness of the gasket B - Movement of both ends of the vane C - Expansion without distortion D - Valves and fittings
