Steam Boilers and Engines problems
- 1. A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly
Options- A. 1.05
- B. 2.86
- C. 6.65
- D. 10.05 Discuss
Correct Answer: 2.86
- 2. The cylinder dimensions of a compound engine may be designed on the basis of
Options- A. equal power developed in each cylinder for uniform turning moment
- B. equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
- C. equal temperature drop in each cylinder for economy of steam
- D. all of the above Discuss
Correct Answer: all of the above
- 3. In natural circulation steam boilers, the circulation of water is by convection currents which are set up during the heating of water.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 4. An air preheater is installed
Options- A. before the economiser
- B. before the superheater
- C. between the economiser and chimney
- D. none of these Discuss
Correct Answer: between the economiser and chimney
- 5. In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to
Options- A. water space also
- B. chimney
- C. steam space
- D. superheater Discuss
Correct Answer: steam space
- 6. A device used to increase the temperature of saturated steam without raising its pressure, is called
Options- A. blow off cock
- B. fusible plug
- C. superheater
- D. stop valve Discuss
Correct Answer: superheater
- 7. The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called
Options- A. induced steam jet draught
- B. chimney draught
- C. forced steam jet draught
- D. none of these Discuss
Correct Answer: forced steam jet draught
- 8. When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as
Options- A. internally fired boiler
- B. externally fired boiler
- C. natural circulation boiler
- D. forced circulation boiler Discuss
Correct Answer: forced circulation boiler
- 9. The diameter of Cornish boiler varies from
Options- A. 0.5 to 1 m
- B. 1 to 2 m
- C. 1.25 to 2.5 m
- D. 2 to 3 m Discuss
Correct Answer: 1 to 2 m
- 10. The natural draught is produced by
Options- A. steam jet
- B. centrifugal fan
- C. chimney
- D. both (a) and (b) Discuss
Correct Answer: chimney
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