Steam Boilers and Engines problems
- 1. Which of the following statement is correct?
Options- A. A horizontal steam engine requires less floor area than a vertical steam engine.
- B. The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure.
- C. The compound steam engines are generally non-condensing steam engines.
- D. all of the above Discuss
Correct Answer: The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure.
- 2. A condenser maintains a low pressure (below atmospheric) so as to obtain the maximum possible energy from steam and thus to secure a high efficiency.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 3. The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. The indicated thermal efficiency is defined as the
Options- A. ratio of thermal efficiency to the Rankine efficiency
- B. ratio of brake power to the indicated power
- C. ratio of heat equivalent to indicated power to the energy supplied in steam
- D. product of thermal efficiency and Rankine efficiency Discuss
Correct Answer: ratio of heat equivalent to indicated power to the energy supplied in steam
- 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
Correct Answer: Yes
- 6. 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
Correct Answer: the flames and hot gases pass through the tubes which are surrounded by water
- 7. 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
Correct Answer: all of these
- 8. Water tube boilers are
Options- A. internally fired
- B. externally fired
- C. internally as well as externally fired
- D. none of these Discuss
Correct Answer: externally fired
- 9. 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
Correct Answer: have separate piston rod
- 10. 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
Correct Answer:
More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.