Steam Boilers and Engines problems
- 1. Cut-off governing as compared to throttle governing is
Options- A. less efficient and less economical
- B. less efficient and more economical
- C. more efficient and less economical
- D. more efficient and more economical Discuss
Correct Answer: more efficient and more economical
- 2. By compounding the expansion of steam in two or more cylinders, the length of stroke
Options- A. does not change
- B. increases
- C. decreases Discuss
Correct Answer: decreases
- 3. The relative efficiency is defined as the
Options- A. ratio of thermal efficiency to Rankine efficiency
- B. ratio of brake power to the indicated power
- C. ratio of heat equivalent to indicated power to the energy supplied in steam
- D. product of thermal efficiency and Rankine efficiency Discuss
Correct Answer: ratio of thermal efficiency to Rankine efficiency
- 4. The internal flue tubes of a Lancashire boiler are reduced in diameter at the back to provide access to the lower part of the boiler.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. The missing quantity per stroke is equal to
Options- A. cylinder feed - indicated mass of steam
- B. cylinder feed + indicated mass of steam
- C. mass of cushion steam + indicated mass of steam
- D. mass of cushion steam + cylinder feed Discuss
Correct Answer: cylinder feed - indicated mass of steam
- 6. Water tube boilers produce steam at a __________ pressure than that of fire tube boilers.
Options- A. lower
- B. higher Discuss
Correct Answer: higher
- 7. Locomotive boiler is a __________ boiler.
Options- A. fire tube
- B. water tube Discuss
Correct Answer: fire tube
- 8. The performance of a boiler is measured by the
Options- A. amount of water evaporated per hour
- B. steam produced in kg/h
- C. steam produced in kg/kg of fuel burnt
- D. all of these Discuss
Correct Answer: all of these
- 9. The theoretical indicator diagram of a simple steam engine is based upon the assumption that
Options- A. there is no pressure drop due to condensation
- B. steam is admitted at boiler pressure and exhausted at condenser pressure
- C. the expansion (or compression) of the steam is hyperbolic
- D. all of the above Discuss
Correct Answer: all of the above
- 10. When steam after doing work in the cylinder passes into a condenser, the engine is said to be a
Options- A. slow speed engine
- B. vertical steam engine
- C. condensing steam engine
- D. non-condensing steam engine Discuss
Correct Answer: condensing steam engine
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