Steam Boilers and Engines problems
- 1. There is about 15 to 20% of coal saving when an economiser is used in a boiler.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. The difference between the atmospheric pressure and the absolute pressure is known as vacuum in a condenser.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 3. 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
Correct Answer: pa = pm x K
- 4. In surface condensers, the condensate and the cooling water mixes up.
Options- A. True
- B. False Discuss
Correct Answer: False
- 5. 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
Correct Answer: control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
- 6. 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
Correct Answer: 0.067 bar
- 7. A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as
Options- A. steam condenser
- B. steam boiler
- C. steam preheater
- D. economiser Discuss
Correct Answer: steam condenser
- 8. A valve installed between the boiler and the feed pump is
Options- A. blow off cock
- B. feed check valve
- C. steam stop valve
- D. none of these Discuss
Correct Answer: feed check valve
- 9. The draught in locomotive boilers is produced by a
Options- A. chimney
- B. centrifugal fan
- C. steam jet
- D. none of these Discuss
Correct Answer: steam jet
- 10. The ratio of the energy required to produce the artificial draught (expressed in metres head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as
Options- A. efficiency of the boiler
- B. efficiency of the chimney
- C. efficiency of the fan
- D. power of the boiler Discuss
Correct Answer: efficiency of the chimney
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