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Steam Boilers QUESTIONS AND ANSWERS

Mechanical Engineering : Steam Boilers QUESTIONS AND ANSWERS :: part8 : 11 to 15

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

11.Which is not the correct statement about moisture in coal

inherent moisture and surface moisture are different things

in some coals moisture may be present upto 40%

some moisture in coal helps in better burning which is not possible with completely dry coal

it increases thermal efficiency

moisture in coal is removed before firing by heating it with hot air.

12.Film boiling occurs at

very low pressure

atmospheric pressures

medium pressures

very high pressures

none of the above.

13.Relative percentage of heat absorbed through the heat transfer of (i) furnace water wall, (ii) boiler bank, (Hi) superheated, (iv) economizer, (v) air heater of a typical boiler of 200 MW capacity would be of the order of

48:20:15:7:10

10:7:15:20:48

20:48:7:15:10

7:15:20:10:48

48:15:10:7:20.

14.The size of a boiler drum in pulverized fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase

increases

decreases

remains unchanged

increases/decreases depending on steam temperature requirements

unpredictable.

15.The condition of steam in boiler drum is always