Steam Boilers and Engines problems
- 1. 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
Correct Answer: ratio of heat actually used in producing steam to the heat liberated in the furnace
- 2. 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
Correct Answer: equal to the height of chimney
- 3. 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
Correct Answer: clearance volume to the swept volume
- 4. 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
Correct Answer: condenser efficiency
- 5. 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
Correct Answer: True
- 6. 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
Correct Answer: all of the above
- 7. In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of
Options- A. 10 atmospheres
- B. 20 atmospheres
- C. 30 atmospheres
- D. 40 atmospheres Discuss
Correct Answer: 20 atmospheres
- 8. The working pressure range for a La-Mont boiler is
Options- A. 0.5 to 10 MN/m2
- B. 1 to 15 MN/m2
- C. 2.5 to 15 MN/m2
- D. 3.5 to 20 MN/m2 Discuss
Correct Answer: 3.5 to 20 MN/m2
- 9. The function of a valve rod is
Options- A. to provide reciprocating motion to the slide valve
- B. to convert reciprocating motion of the piston into rotary motion of the crank
- C. to convert rotary motion of the crankshaft into to and fro motion of the valve rod
- D. to provide simple harmonic motion to the D-slide valve Discuss
Correct Answer: to provide simple harmonic motion to the D-slide valve
- 10. The function of an eccentric rod is
Options- A. to provide reciprocating motion to the slide valve
- B. to convert reciprocating motion of the piston into rotary motion of the crank
- C. to convert rotary motion of the crankshaft into to and fro motion of the valve rod
- D. to provide simple harmonic motion to the D-slide valve Discuss
Correct Answer: to convert rotary motion of the crankshaft into to and fro motion of the valve rod
More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.