Discussion
Home ‣ Mechanical Engineering ‣ Steam Boilers and Engines Comments
- Question
The function of a safety valve is
Options- A. to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
- B. to indicate the water level inside the boiler to an observer
- C. to measure pressure of steam inside the steam boiler
- D. none of the above
- Correct Answer
- to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
- 1. When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a
Options- A. slow speed engine
- B. medium speed steam engine
- C. high speed steam engine
- D. none of these Discuss
- 2. A single acting steam engine produces __________ power than that of double acting steam engine.
Options- A. equal
- B. half
- C. double
- D. four times Discuss
- 3. Which of the following boiler is best suited to meet the fluctuating demand of steam?
Options- A. Locomotive boiler
- B. Lancashire boiler
- C. Cornish boiler
- D. Babcock and Wilcox boiler Discuss
- 4. Cut-off governing of steam engines is a method of controlling the engine output by varying
Options- A. volume of intake steam
- B. pressure of intake steam
- C. temperature of intake steam
- D. all of these Discuss
- 5. In a uniflow engine
Options- A. steam enters and exhausts through the same port
- B. steam enters at one end and exhausts at the centre
- C. steam enters at the centre and exhausts at the other end
- D. none of the above Discuss
- 6. Which of the following statement is wrong?
Options- A. The factor of evaporation for all boilers is always greater than unity.
- B. The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C.
- C. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.
- D. none of the above Discuss
- 7. Which of the following statement is correct for a compound steam engine?
Options- A. The cost of the engine, for the same power and economy, is more than that of a simple steam engine.
- B. The forces in the working parts are increased as the forces are distributed over more parts.
- C. The ratio of expansion is reduced, thus reducing the length of stroke.
- D. The temperature range per cylinder is increased, with corresponding increase in condensation. Discuss
- 8. 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% Discuss
- 9. In water tube boilers
Options- A. water passes through the tubes which are surrounded by flames and hot gases
- B. the flames and hot gases pass through the tubes which are surrounded by water
- C. forced circulation takes place
- D. none of these Discuss
- 10. Which of the following statement is wrong?
Options- A. Locomotive boiler is a water tube boiler.
- B. Water tube boilers are internally fired.
- C. La-mont boiler is a low pressure water tube boiler.
- D. all of the above Discuss
Steam Boilers and Engines problems
Search Results
Correct Answer: medium speed steam engine
Correct Answer: half
Correct Answer: Locomotive boiler
Correct Answer: volume of intake steam
Correct Answer: steam enters at one end and exhausts at the centre
Correct Answer: none of the above
Correct Answer: The ratio of expansion is reduced, thus reducing the length of stroke.
Correct Answer: 63%
Correct Answer: water passes through the tubes which are surrounded by flames and hot gases
Correct Answer: all of the above
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.