WTP Certification Questions

WTP Certification Questions Which of the following is a type of pump commonly used in water treatment plants? - Centrifugal What is a multistage pump? - Has more than one impeller If the pump impeller is running backwards, what action must be taken to correct the rotation? - Switch any two electrical leads When should the packing of a pump be adjusted? - When the pump is running When a pump fails to deliver at its rated capacity, what is the most likely cause? - Air leak What is a common cause for vibration in a motor? - Misalignment of the couplings What is the purpose of the wear rings in a pump? - Plug internal leakage What should the seal water pressure be for a pump? - 5 psi higher than the pumps discharge pressure What is the purpose off the seal water? - Block out air intake and lubricate packing What is the recommended maximum suction lift? - 15 ft In water treatment plant, what type of pump is commonly used to deliver chemicals solutions? - Positive displacement When should you lubricate your equipment? - Lubricate following the manufacture recommendations In what manner is packing installed? - A strip at a time and staggered A positive displacement pump should never be operated ______? - Against a closed discharge valve If two or more pumps of the same size and purpose are on line, what method of operation is recommended for them? - Alternate to equalize wear What is the purpose of a lantern ring? - Water seal The packing of a pump should be adjusted to _______? - Allow a slight operating leak, to allow approximately a drip per second On a multiple drive motor, when a belt fails, what corrective action should be taken? - Replace all the belts in the drive To keep a centrifugal pump primed, install a ____ valve at the end of the suction line. - Foot If half of the mechanical seal fails, what corrective action should be taken? - Change both halves of the seal If a motor fails to start, what should be checked first? - Power supply Opening or closing a valve rapidly will cause? - Water hammer The formation and collapse of a gas pocket or bubble on the blade of an impeller is called? - Cavitation Changing the packing on a pump is called ___ maintenance? - Corrective What is an example of a daily maintenance task for a compressor? - Drain the air receiver What type of valve is usually used to control the rate of flow? - Globe valve What type of valve is buried? - Non-rising stem What is the most common type of valve used in water treatment plants? - Gate valves What will happen if the gate valve is left half open to control flow? - Undue seat wear In what manner should carbon be stored? - On concrete floors in single rows What is brinelling? - A type of bearing wear What is recommended manner for storing potassium permanganate? - On concrete floors away from heat or heated pipes What cause more damage to a pumps impeller? - Air What is the unit of electrical resistance? - Ohm What is an ammeter used for? - Measure amps/ current What type of electrical service is usually found in water plants? - Three phase Generally, all motors over 2 HP require what type of electrical service? - Three phase Before starting work on any electrical equipment, you must first ____? - Lock out tag out What unit is used to measure the rate of power consumption? - Kilowatts What is the function of a shear pin? - To prevent damage to equipment when there is an overload What is an ampere? - A unit of measure for current The measurement of how close an instrument determines the true or actual reading of an instrument is called? - Accuracy The readout of an instrument by the use of a pointer against a scale is an ____ reading. - Analog The device that controls the operation of equipment is called? - Controller The readout of an instrument by a direct numerical reading of the measured valve is called a ____ reading? - Digital