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Chapter 5
Feedwater Systems
| Question | Answer |
|---|---|
| A makeup control valve is used to ? a. add condensate to the boiler if the water level is high b. maintain a constant water level in the feedwater heater c. start and stop the feedwater pump on the boiler demand d. all of the above | b. maintain a constant water level in the feedwater heater |
| The ? is the water level designated as being the proper water level for safe boiler operation a. normal operating water level ( NOWL ) b. safe water level ( SWL ) c. design operating water level ( DOWL ) d. low-water fuel cutoff ( LWCO ) | a. normal operation water level ( NOWL ) |
| The purpose of a feedwater regulator is to ? a. shutdown the boiler in the event of low water b. prevent a furnace shutdown c. control water level in the feedwater heater d. maintain a constant water level in the boiler | d. maintain a constant water level in the boiler |
| Feedwater regulators control the feedwater pump to maintain the water level ? a. on the steam side b. on the water line c. on the blowdown line d. at the NOWL | d. at the NOWL |
| The sequence of the three numbers found on the nameplate mounted on a reciprocating feedwater pump refers to the ? a. area of steam piston, are of the water piston, and the length of the pump stroke b. diameter of the steam piston, diameter of the wat | b. diameter of the steam piston, diameter of the water piston, and length of the pump stroke |
| ? are usually used to create the draft needed to overcome the resistance cause by economizer tubes a. natural draft conditions b. air flow meters c. induced draft fans d. flow regulators | c. induced draft fans |
| An economizer uses the heat energy from the gases of combustion leaving the boiler to heat the ? a. air b. steam c. fuel oil d. feedwater | d. feedwater |
| Turbine feedwater pumps are ? a. negative- displacement pumps b. positive- displacement pumps c. pumps that can only be steam driven d. straight mechanical- drive pumps | b. posiitive- displacement pumps |
| A turbine feedwater pump must be equipped with an ? on the discharge line to protect the pump from excessive pressure a. bypass line b. overspeed trip c. pump governor d. relief valve | d. relief valve |
| Water that is too hot in the open feedwater heater can cause a. oxygen pitting in the boiler b. thermal shock to the boiler c. the feedwater pump to become steambound d. the feedwater pump waterbound | c. the feedwater pump to become steambound |
| Water temperatures that are too low in an open feedwater heater will cause ? a. oxygen pitting in the boiler b. cavitation in the feedwater pump c. the feedwater pump to become steambound d. the feedwater pump to become waterbound | a. oxygen pitting in the boilers |
| The ? of a centrifugal feedwater pump is the rotating element that imparts centrifugal force to the liquid a. casing b. shaft bearing c. impeller d. shaft | c. impeller |
| Plant efficiency is increased when an ? uses steam that is bled or extracted from a steam turbine a. economizer b. closed feedwater heater c. flue gas heat recovery unit d. blowdown heat recovery system | b. closed feedwater heater |
| If only one low- water fuel cutoff is used, it must have an ? a. manual reset b. automatic restart c. high- level alarm d. auxiliary backup | a. manual reset |
| One way to increase the efficiency of a plant is to ? a. burn as much fuel as needed b. use a boiler with the highest capacity needed c. recover as much heat as possible from the fuel d. increase the temperature of gases leaving the boiler | c. recover as much heat as possible from the fuel |
| A ? is a boiler fitting that reduces the turbulence of boiler water to make it easier to measure the water level a. water column b. low-water fuel cutoff c. try cock d. flow-control valve | a. water column |
| The piping that connects a water column to the boiler must be a minimum of ? and must meet the ASME code requirements for pressure and temperature a. 1/4 b. 1/2 c. 1 d. 2 | c. 1 |
| ? is the process where the water level in a boiler momentarily rises with an increase in steam demand a. turbulence b. foaming c. shrink d. swell | d. swell |
| ? feedwater regulators are found on package firetube or watertube boilers where feedwater pumps ruhn either intermittently or continuously a. float b. thermostatic c. impulse d. thermodynamic | a. float |
| A three element feedwater regulator measure the steam flow from the boiler, the ? into the boiler, and the water level a. fuel flow b. feedwater flow c. steam pressure d. orifice flow | b. feedwater flow |
| After blowing down a thermohydraulic feedwater regulator, approximately 60 minutes should be allowed for the regulator to ? before being returned to service a. stabilize b. cycle on and off c. cool off d. warm up | a. stabilize |
| An ? is used in applications where there are varying flows of condensate and additional condensate storage capacity is required a. surge tank b. economizer c. float feedwater regulator d. centrifugal pump | a. surge tank |
| The ? pump uses the shape of its casing to direct the discharge a. turbine b. reciprocating c. centrifugal d. positive-displacement | c. centrifugal |
| Some boiler rooms use ? pumps for reserve or backup units in the event of a electrical power failure a. turbine b. reciprocating c. centrifugal d. all of the above | b. reciprocating |
| A ? feedwater heater allows steam and feedwater to mix with each other at atmospheric pressure to raise the temperature of the water a. horizontal b. vertical c. closed d. open | d. open |
Created by:
zmos89