Mechanical Engineering :: Steam Nozzles and Turbines
- The capacity of induced draft fan compared to forced draft fan in a boiler is
- Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?
- The ratio of the useful heat drop to the isentropic heat drop is called
- In recuperative air preheaters, the heat is transferred
- In regenerative air preheaters, the heat is transferred
- Which of the following statement is wrong?
- Which of the following statement is wrong?
- Which of the following statement is wrong?
- Which of the following statement is wrong?
- An air preheater is installed
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A.
Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler |
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B.
Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler |
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C.
Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes |
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D.
Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube |
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A.
The factor of evaporation for all boilers is always greater than unity |
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B.
The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C |
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C.
The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency |
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D.
None of the above |
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A.
The critical pressure gives the velocity of steam at the throat equal to the velocity of sound |
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B.
The flow in the convergent portion of the nozzle is subsonic |
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C.
The flow in the divergent portion of the nozzle is supersonic |
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D.
To increase the velocity of steam above sonic velocity (supersonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary |