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Chapter 1
Steam Boilers
| Question | Answer |
|---|---|
| A low pressure steam boiler has an MAWP of ? psi a. 15 b. 35 c. 50 d. 75 | a. 15 |
| The higher the steam pressure, the higher the ? of the water in the boiler a. impurities b. boiling point c. volume d. atmospheric pressure | b. boiling point |
| ? is the amount of energy equal to the evaporation of 34.5 lb of water/hr at a feedwater temperature of 212 F a. factor of evaporation b. boiler horsepower c. latent heat of fusion d. evaporation energy | b. boiler horsepower |
| When a steam boiler is operating at 100 pounds per psi the temperature of the water and steam will be approximately ?degrees F a. 115 b. 225 c. 338 d. 550 | c. 338 |
| A horizontal return tubular (HRT) boiler is a ? boiler a. watertube b. firetube c. scotch marine d. none of the above | b. firetube |
| As steam pressure in a boiler increases, there is a a corresponding increase in the ? a. superheat b. volume of steam c. boiler horsepower d. temperature | d. temperature |
| A sudden drop in pressure from 100 psig to 0 psig without a corresponding drop in the temperature could result in a ? a. explosion b. flooding condition c. loss of efficiency d. increase in surface tension | a. explosion |
| Water will boil and turn to steam when it reaches ? degree F at atmospheric pressure at sea level a. 78 b. 100 c. 212 d. 338 | c. 212 |
| ? efficiency is the ratio of the heat absorbed by the boiler output to the heat available in the fuel a. combustion b. watertube c. thermal d. overall plant | b. thermal |
| Baffles are used to direct gases so that they come in close contact with the ? a. feedwater b. combustion chamber c. superheater d. boiler heating surface | d. boiler heating surface |
| ? stress is stress that occurs when two forces of equal intensity act parallel to each other but in opposite direction a. compressive b. shear c. tensile d. none of the above | b. shear |
| Some watertube boilers are equipped with ? to increase the heating surface and the life of the furnace refractory a. brickwork b. baffles c. waterwalls d. stays | c. waterwalls |
| A disadvantage of a vertical firetube boiler is that it requires a. a high ceiling b. the use of staybolts c. a lot of floor space d, special alloyed tubes | a. a high ceiling |
| In a firetube boiler, the heat produced by the gases of combustion ? a. passes through the tubes b. surrounds the tubes c. bypasses the combustion chamber d. surrounds the combustion chamber | a. passes through the tubes |
| Watertube boilers were designed to operate at pressures as high as ? psi, a point known as the critical pressure of steam a. 512 b. 1015 c. 3206 d. 5000 | c. 3206 |
| A mud drum if used, is the lowest part of the water side of a ? boiler a. hrt b. watertube c. firetube d. electric | b. watertube |
| A ? boiler is a watertube boiler in which replaceable serpentine tubes are connected to the upper and lower drums and surround the firebox a. straight tube b. bent tube c. membrane d. flex tube | d. flex tube |
| In electrode boilers, heat is generated by electric current flowing from one electrode to another electrode through the ? a. metal plates b. stainless steel tubes c. coiled conductor d. boiler water | d. boiler water |
| A high pressure steam boiler operates at a steam pressure over ? psi a. 1 b. 15 c. 212 d. 970 | b. 15 |
| A condensing economizer recovers ? btu/lb from the heat in the water vapor a. 32 b. 212 c. 970 d. 1150 | c. 970 |
| Boiler tubes are manufactured using materials that meet ?specifications a. abma b,. asme c. astm d. doe | c. astm |
| In a watertube boiler, the heated water inside the tubes becomes ? , causing it to rise a. less dense b. more dense c. less viscous d. more viscous | a. less dense |
| Cogeneration produces ? for use in a process or heating a. hot air b. hot water c. electricity d. gas | c. electricity |
| A ? is a device that converts mechanical energy into electrical energy by means of electromagnetic induction a. generator b. transfer switch c. transformer d. turbine | a. generator |
| ? is used to support and protect electrical conductors a. switchgear b. a motor control circuit c. conduit d. a switch | c. conduit |
Created by:
zmos89