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- Question
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
- Correct Answer
- ratio of heat actually used in producing steam to the heat liberated in the furnace
- 1. 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.
Discuss
- 2. 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
- 3. Water tube boilers are
Options- A. internally fired
- B. externally fired
- C. internally as well as externally fired
- D. none of these Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. In a boiler, the heat is lost
Options- A. to dry flue gases
- B. in moisture present in the fuel
- C. to steam formed by combustion of hydrogen per kg of fuel
- D. all of the above Discuss
Steam Boilers and Engines problems
Search Results
Correct Answer:
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: equal to the height of chimney
Correct Answer: clearance volume to the swept volume
Correct Answer: condenser efficiency
Correct Answer: True
Correct Answer: all of the above
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