Discussion
Home ‣ Mechanical Engineering ‣ Steam Boilers and Engines See What Others Are Saying!
- Question
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
Options- A. 56%
- B. 63%
- C. 74%
- D. 78%
- Correct Answer
- 63%
- 1. The natural convection air cooled condensers are used in
Options- A. domestic refrigerators
- B. water coolers
- C. room air conditioners
- D. all of these Discuss
- 2. The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.
Options- A. True
- B. False Discuss
- 3. The iron ore in the charge of blast furnace acts as an iron bearing mineral.
Options- A. True
- B. False Discuss
- 4. A flow in which the quantity of liquid flowing per second is not constant, is called
Options- A. streamline flow
- B. turbulent flow
- C. steady flow
- D. unsteady flow Discuss
- 5. The volumetric efficiency for reciprocating air compressors is about
Options- A. 10 to 40%
- B. 40 to 60%
- C. 60 to 70%
- D. 70 to 90% Discuss
- 6. The angle included between the two lips projected upon a plane parallel to the drill axis and paralled to the two cutting lips, is called helix angle.
Options- A. Correct
- B. Incorrect Discuss
- 7. The increase in pressure in a roots blower is entirely due to back flow of air.
Options- A. Agree
- B. Disagree Discuss
- 8. The power actually developed by the engine cylinder of an I.C. engine is known as
Options- A. theoretical power
- B. actual power
- C. indicated power
- D. none of these Discuss
- 9. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
Options- A. dry bulb temperature
- B. wet bulb temperature
- C. dew point temperature
- D. specific humidity Discuss
- 10. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
Options- A. 0.26
- B. 0.36
- C. 0, 46
- D. 0.56 Discuss
More questions
Correct Answer: domestic refrigerators
Correct Answer: True
Correct Answer: True
Correct Answer: unsteady flow
Correct Answer: 70 to 90%
Correct Answer: Incorrect
Correct Answer: Agree
Correct Answer: indicated power
Correct Answer: dew point temperature
Correct Answer: 0, 46
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.