Steam Boilers and Engines problems
- 1. The amount of water evaporated in kg per kg of fuel burnt is called
Options- A. evaporative capacity of a boiler
- B. equivalent evaporation from and at 100° C
- C. boiler efficiency
- D. none of these Discuss
Correct Answer: evaporative capacity of a boiler
- 2. By compounding the expansion of steam in two or more cylinders, the ratio of expansion
Options- A. does not change
- B. increases
- C. decreases Discuss
Correct Answer: decreases
- 3. The average value of diagram factor lies between
Options- A. 0.2 to 0.5
- B. 0.5 to 0.65
- C. 0.65 to 0.9
- D. 0.8 to 1.2 Discuss
Correct Answer: 0.65 to 0.9
- 4. Which of the following is a fire tube boiler?
Options- A. Lansashire boiler
- B. Babcock and Wilcox boiler
- C. Yarrow boiler
- D. none of these Discuss
Correct Answer: Lansashire boiler
- 5. Fire tube boilers are limited to a maximum working pressure of
Options- A. 0.17 MN/m2
- B. 1.7 MN/m2
- C. 17 MN/m2
- D. 170 MN/m2 Discuss
Correct Answer: 1.7 MN/m2
- 6. The diameter of superheated tubes in a locomotive boiler is
Options- A. 13 mm
- B. 31 mm
- C. 130 mm
- D. 230 mm Discuss
Correct Answer: 130 mm
- 7. When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as
Options- A. throttle governing
- B. cut-off governing
- C. by-pass governing
- D. none of these Discuss
Correct Answer: throttle governing
- 8. For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is __________ the piston speed of single acting steam engine.
Options- A. equal to
- B. twice
- C. three times
- D. four times Discuss
Correct Answer: twice
- 9. The ratio of the actual vacuum to the ideal vacuum in a condenser is called
Options- A. condenser efficiency
- B. vacuum efficiency
- C. nozzle efficiency
- D. boiler efficiency Discuss
Correct Answer: vacuum efficiency
- 10. The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height ot the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K)
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
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