Discussion
Home ‣ Mechanical Engineering ‣ Steam Boilers and Engines See What Others Are Saying!
- Question
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
Options- A. 56%
- B. 63%
- C. 74%
- D. 78%
- Correct Answer
- 63%
- 1. The ability of a material to absorb energy in the plastic range is called
Options- A. resilience
- B. creep
- C. fatigue strength
- D. toughness Discuss
- 2. Structural sections such as rails, angles, I-beams are made by
Options- A. hot rolling
- B. hot drawing
- C. hot piercing
- D. hot extrusion Discuss
- 3. The absolute pressure is equal to
Options- A. gauge pressure + atmospheric pressure
- B. gauge pressure - atmospheric pressure
- C. atmospheric pressure - gauge pressure
- D. gauge pressure - vacuum pressure Discuss
- 4. A compound steam engine requires a heavier flywheel than simple steam engines.
Options- A. True
- B. False Discuss
- 5. The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.
Options- A. Agree
- B. Disagree Discuss
- 6. The mechanical advantage of a lifting machine is the ratio of
Options- A. distance moved by effort to the distance moved by load
- B. load lifted to the effort applied
- C. output to the input
- D. all of the above Discuss
- 7. The advantage of the fuel injection system over the carburetor system is
Options- A. improved fuel efficiency
- B. improved emission
- C. improved power output
- D. all of these Discuss
- 8. A maintenance free battery
Options- A. has lead-antimony plate grid
- B. has lead-calcium plate grid
- C. does not contain acid
- D. does not contain water Discuss
- 9. Drilling is an example of
Options- A. orthogonal cutting
- B. oblique cutting
- C. simple cutting
- D. uniform cutting Discuss
- 10. Reactors for propulsion applications are designed for
Options- A. any form of uranium
- B. natura uranium
- C. enriched uranium
- D. plutonium Discuss
More questions
Correct Answer: resilience
Correct Answer: hot rolling
Correct Answer: gauge pressure + atmospheric pressure
Correct Answer: False
Correct Answer: Agree
Correct Answer: load lifted to the effort applied
Correct Answer: all of these
Correct Answer: has lead-calcium plate grid
Correct Answer: oblique cutting
Correct Answer: enriched uranium
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