# Mechanical Engineering - Steam Boilers and Engines

### Exercise :: Steam Boilers and Engines - Section 5

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

Explanation:

No answer description available for this question. Let us discuss.

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

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

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

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