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Chapter 2
Boiler Systems
| Question | Answer |
|---|---|
| If the boiler is generating 20,000 lb/hr of steam, it must be supplied with lb/hr of feedwater a. 10,000 b. 20,000 c. 30,000 d. 40,000 | b. 20,000 |
| From the deaerator, oxygen and other noncondensable gases are separated from the feedwater and directed to the atmosphere a. by using the closed feedwater heater b. through the economizer c. by using steam traps d. through the vent | d. through the vent |
| An ? system is a system of measuring instruments and controllers that work together to control a process a. instrumentation b. feedwater c. control d. combustion | c. control |
| One pound of water is needed to produce ? of steam a. 1 lb b. 3 lb c 144 btu d. 970.3 btu | a. 1 lb |
| In a low pressure gas system, the ? valve is an electric valve that cannot be opened until the gas pilot is lit a. check b. pressure regulating c. manual reset d. pressure reducing | c. manual reset |
| ? are used for loads that require dry steam, such as turbines a. super heaters b. forced draft fans c. reclaimed steam lines d, automatic non return valves | a. super heaters |
| In a feedwater system, the ? valve is located closest to the shell of the boiler on the feedwater line so that the check valve can be repaired without draining the boiler a. blowdown b. manual reset c. stop d. automatic nonreturn | c. stop |
| A steaming boiler can have the water in the gauge glass go from half full to empty in a matter of ? if the water is not added to the boiler a, minutes b. hours c. days d. weeks | a. minutes |
| In a fuel oil system, the purpose of duplex strainers is to ? a. isolate the fuel oil system in the event of fire b. remove water from the fuel c. prevent return flow to the tank d. permit one strainer to be cleaned while the other is in service | d. permit one strainer to be cleaned while the other is in service |
| Superheated steam has more ? than saturated steam at the same pressure a. heat energy b. volume c. pressure d. moisture | a. heat energy |
| The deaerator is located ? a. above the feedwater pumps b. below the feedwater pumps c. after the closed feedwater heater d. before the centrifugal pump | a. above the feedwater pumps |
| A gas pilot line on a high pressure gas system supplies gas through a ? valve to the pilot gas pressure regulator a. check b. shutoff c. butterfly d. throttling | b. shutoff` |
| The purpose of any fuel oil system is to supply fuel oil to the burner at the proper ? a. temperature and volume b. volume and pressure c. temperature and pressure d. viscosity and speed | c. temperature and pressure |
| Numeber ? fuel oil needs to be heated before it is pumped so that it can flow a. 2 b. 3 c. 4 d. 6 | d. 6 |
| Pulverizing coal allows ? a. the coal to be stored easily b. for better burning on the grates c. for closer contact between the coal and oxygen for complete combustion d. for easy hand firing | c. for closer contact between the coal and oxygen for complete combustion |
| Draft is ? caused by a difference in pressure between two points a. the balance of pressure b. the flow of air or gases of combustion c. a type of back pressure d. none of the above | b the flow of air or gases of combustion |
| Natural draft is the result of temperature differences between ? a. fuel and air b. burning coal and sulfur c. air and gases of combustion d. fuel oil and gases of combustion | c. air and gases of combustion |
| In a high pressure gas system, the air mixes with the gas in the ? a. injector b. gas pilot line c. burner register d. pulverizer | c. burner register |
| A measuring instrument can use a ? to send a signal to a controller a. control valve b. final element c. transmitter d. primary element | c. transmitter |
| Pulverized coal is ground into fine powder and blown into the combustion chamber where it is burned in ? a. scales b, grates c. suspension d. large particles | c. suspension |
| A control system uses a ? to execute a control strategy a. steam pressure gauge b. pressure control station c. feedwater control valve d. control loop | d. control loop |
| Water weighs approximately ? lbs per gallon a. 2.5 b. 6.4 c. 8.3 d. 10.2 | c. 8.3 |
| Induced draft is produced by pulling air through the boiler furnace with a fan located in the ? a. breeching b. inlet damper c. combustion chamber d. economizer | a. breeching |
| A control loop uses a ? as the control element a. pressure transmitter b. modulating water valve c. temperature sensor d. steam pressure controller | d. steam pressure controller |
| Codes may require that an ? be positioned before the firing rate valve that controls the volume of gas to the burner a. equalizer b. manual shutoff valve c. flue gas analyzer d. pressure reducing governor | b. manual shutoff valve |
Created by:
zmos89