Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
- Question
The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.
Options- A. equal to
- B. directly proportional to
- C. inversely proportional to
- Correct Answer
- directly proportional to
- 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
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