Mechanical Engineering - Steam Boilers and Engines

11. 

Which of the following is correct ? (where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

A. pa = pm/K
B. pa = pm x K
C. pa = K/pm
D. pa = pm + K

Answer: Option B

Explanation:

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12. 

The working pressure range for a La-Mont boiler is

A. 0.5 to 10 MN/m2
B. 1 to 15 MN/m2
C. 2.5 to 15 MN/m2
D. 3.5 to 20 MN/m2

Answer: Option D

Explanation:

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13. 

The draught in locomotive boilers is produced by a

A. chimney
B. centrifugal fan
C. steam jet
D. none of these

Answer: Option C

Explanation:

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14. 

The ratio of heat actually used in producing the steam to the heat liberated in the furnace is known as equivalent evaporation from and at 100° C.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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15. 

There is about 15 to 20% of coal saving when an economiser is used in a boiler.

A. True
B. False

Answer: Option A

Explanation:

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