Discussion
Home ‣ Mechanical Engineering ‣ Steam Boilers and Engines Comments
- Question
The boiler efficiency is given by (where m = Total mass of water evaporated into steam in kg/h, mf = Mass of fuel in kg/h, C = Calorific valve of fuel in kJ/kg of fuel, h = Total heat of steam in kJ/kg, and hf1 = Sensible heat of feed water in kJ /kg)
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. In a Woolf type compound engine, the high pressure and low pressure cylinders
Options- A. have common piston rod
- B. are set at 90°
- C. have separate piston rod
- D. are set in V - arrangement Discuss
- 2. Water tube boilers are
Options- A. internally fired
- B. externally fired
- C. internally as well as externally fired
- D. none of these Discuss
- 3. The value of diagram factor depends upon
Options- A. initial conditions of steam
- B. back pressure
- C. initial pressure of steam
- D. all of these Discuss
- 4. In fire 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
- 5. A device used to empty the boiler whenever required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler, is called blow off cock.
Options- A. Yes
- B. No Discuss
- 6. The efficiency of a boiler is defined as
Options- A. ratio of heat actually used in producing steam to the heat liberated in the furnace
- B. ratio of the mass of steam produced to the mass of total water supplied in a given time
- C. ratio of the heat liberated in the furnace to the heat actually Used in producing steam
- D. none of the above Discuss
- 7. For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be
Options- A. one-half the height of chimney
- B. equal to the height of chimney
- C. two times the height of chimney
- D. four times the height of chimney Discuss
- 8. Clearance ratio is the ratio of
Options- A. clearance volume to the swept volume
- B. clearance volume to the volume at cut-off
- C. volume at cut-off to the swept volume
- D. swept volume to the clearance volume Discuss
- 9. The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
Options- A. condenser efficiency
- B. vacuum efficiency
- C. nozzle efficiency
- D. boiler efficiency Discuss
- 10. A water level indicator is a device to indicate the exact water level in the boiler at any instant.
Options- A. True
- B. False Discuss
Steam Boilers and Engines problems
Search Results
Correct Answer: have separate piston rod
Correct Answer: externally fired
Correct Answer: all of these
Correct Answer: the flames and hot gases pass through the tubes which are surrounded by water
Correct Answer: Yes
Correct Answer: ratio of heat actually used in producing steam to the heat liberated in the furnace
Correct Answer: equal to the height of chimney
Correct Answer: clearance volume to the swept volume
Correct Answer: condenser efficiency
Correct Answer: True
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