Water Distribution Section 2 Grade 3 Questions With Correct Answers

_______ is measured in feet. - Answer Head is measured in feet. It is best to use a __________ type of impeller for pumping water with a low volume of solids. - Answer It is best to use a closed type of impeller for pumping water with a low volume of solids. Atmospheric pressure at sea level is equal to ____ feet of water head 14.7 psi = 0.433 ft/psi = 33.9 ft. - Answer Atmospheric pressure at sea level is equal to 34 feet of water head 14.7 psi = 0.433 ft/psi = 33.9 ft The study of fluids in motion is called _________. - Answer The study of fluids in motion is called hydraulics. __________(flow rate with units of gpm) is plotted on the horizontal axis of a pump curve. - Answer Capacity (rate with units of gpm) is plotted on the horizontal axis of a pump curve. _________(with units of feet) is plotted on the vertical axis of a pump curve. - Answer Head (with units of feet) is plotted on the vertical axis of a pump curve. The resistance of a material to the flow of electrical current is measured in _______. - Answer The resistance of a material to the flow of electrical current is measured in ohms. The speed of a variable speed pump should be monitored to prevent ___________ from occurring. - Answer The speed of a variable speed pump should be monitored to prevent cavitation from occurring. The ____________ ____________ must be determined first when designing a pump station. - Answer The head requirements must be determined first when designing a pump station. Centrifugal pumps with __________ ________ impellers are the type most commonly used by water systems - Answer Centrifugal pumps with radial flow impellers are the type most commonly used by water systems ___________ ___________ is the amount of energy in feet required to overcome resistance to flow in a pipe. - Answer Friction head is the amount of energy in feet required to overcome resistance to flow in a pipe. An ___________ __________ pump has the ability to rotate its discharge 360°. - Answer An end suction pump has the ability to rotate its discharge 360° The temperature of centrifugal pump motor ____________ should be checked with a thermometer once a ___________. - Answer The temperature of centrifugal pump motor bearings should be checked with a thermometer once a month. The _________ _________ houses the packing and lantern ring in a centrifugal pump. - Answer The stuffing box houses the packing and lantern ring in a centrifugal pump. The _________ _________ is at the top of the stuffing box and can be tightened or loosened to control packing leakage. - Answer The packing gland is at the top of the stuffing box and can be tightened or loosened to control packing leakage. A _________ _________ is used to prevent air leakage along the pump shaft when it is operating under suction lift conditions. - Answer A lantern ring is used to prevent air leakage along the pump shaft when it is operating under suction lift conditions. A ____________ ___________ is used in place of packing when the pump suction pressure is a 60 psi. - Answer A mechanical seal is used in place of packing when the pump suction pressure is z60 psi. The heart of a pump is called the _____________. - Answer The heart of a pump is called the impeller. The first oil change on a newly installed pump should be performed after ___ month of operation. - Answer The first oil change on a newly installed pump should be performed after 1 month of operation. Bearings that maintain the radial positioning of a pump shaft are called ____________ ____________. - Answer Bearings that maintain the radial positioning of a pump shaft are called radial bearings. Pump shaft packing is usually replaced when tightening the packing gland does not reduce shaft ___________ or the packing gland can no longer be ___________. - Answer Pump shaft packing is usually replaced when tightening the packing gland does not reduce shaft leakage or the packing gland can no longer be tightened.