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)
pa = pm/K
pa = pm x K
pa = K/pm
pa = pm + K
Answer: Option
Explanation:
No answer description is available. Let's discuss.

12.
The working pressure range for a La-Mont boiler is
0.5 to 10 MN/m2
1 to 15 MN/m2
2.5 to 15 MN/m2
3.5 to 20 MN/m2
Answer: Option
Explanation:
No answer description is available. Let's discuss.

13.
The draught in locomotive boilers is produced by a
chimney
centrifugal fan
steam jet
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.

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.
Correct
Incorrect
Answer: Option
Explanation:
No answer description is available. Let's discuss.

15.
There is about 15 to 20% of coal saving when an economiser is used in a boiler.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.