Discussion
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- Question
There is about 15 to 20% of coal saving when an economiser is used in a boiler.
Options- A. True
- B. False
- Correct Answer
- True
- 1. The function of a piston in a steam engine is
Options- A. to guide motion of the piston rod and to prevent it from bending
- B. to transfer motion from the piston to the cross-head
- C. to convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment Discuss
- 2. The amount of water evaporated from and at 100° C into dry and saturated steam is called evaporative capacity of a boiler.
Options- A. Yes
- B. No Discuss
- 3. An economiser is generally placed between
Options- A. last superheater or reheater and air preheater
- B. induced draft fan and forced draft fan
- C. air preheater and chimney
- D. none of the above Discuss
- 4. The length of Cornish boiler varies from
Options- A. 2 to 4.5 m
- B. 3 to 5 m
- C. 5 to 7.5 m
- D. 7 to 9 m Discuss
- 5. 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.
Options- A. Correct
- B. Incorrect Discuss
- 6. The difference between the atmospheric pressure and the absolute pressure is known as vacuum in a condenser.
Options- A. Agree
- B. Disagree Discuss
- 7. Which of the following is correct? (where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)
Options- A. pa = pm/K
- B. pa = pm x K
- C. pa = K/pm
- D. pa = pm + K Discuss
- 8. In surface condensers, the condensate and the cooling water mixes up.
Options- A. True
- B. False Discuss
- 9. The principal function of a stop valve is to
Options- A. control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
- B. empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
- C. put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
- D. increase the temperature of saturated steam without raising its pressure Discuss
- 10. In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is
Options- A. 0.007 bar
- B. 0.053 bar
- C. 0.06 bar
- D. 0.067 bar Discuss
Steam Boilers and Engines problems
Search Results
Correct Answer: to convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment
Correct Answer: No
Correct Answer: last superheater or reheater and air preheater
Correct Answer: 5 to 7.5 m
Correct Answer: Incorrect
Correct Answer: Agree
Correct Answer: pa = pm x K
Correct Answer: False
Correct Answer: control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Correct Answer: 0.067 bar
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