McqMate
| Q. |
The temperature of boiling water in a steam engine may be high because - |
| A. | there are dissolved substances in water |
| B. | there is low pressure inside the boiler |
| C. | there is high pressure inside the boiler |
| D. | the lire is at very high temperature |
| Answer» C. there is high pressure inside the boiler | |
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Explanation: In the boiler of a steam engine, there is a firebox where coal is shoveled into. The coal is kept burning at a very hightemperature, and is used to heat the boiler to boil water producing a high pressure steam. The high-pressure steam expands and exits the boiler via steam pipes into the steam reservoir; the steam is then controlled by a slide valve to move into a cylinder to push the piston. |
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