Discussion
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- Question
The ratio of the energy required to produce the artificial draught (expressed in metres head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as
Options- A. efficiency of the boiler
- B. efficiency of the chimney
- C. efficiency of the fan
- D. power of the boiler
- Correct Answer
- efficiency of the chimney
- 1. The hardness and tensile strength in austenitic stainless steel can be increased by
Options- A. hardening and cold working
- B. normalising
- C. martempering
- D. full annealing Discuss
- 2. When a gear box has four forward speeds and one reverse speed, it is said to be a
Options- A. 3-speed gear box
- B. 4-speed gear box
- C. 5-speed gear box
- D. 6-speed gear box Discuss
- 3. The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.
Options- A. The bodies A and B have equal stability
- B. The body A is more stable than body B
- C. The body B is more stable than body A
- D. The bodies A and B are unstable Discuss
- 4. Which of the following refrigerant has the lowest freezing point?
Options- A. R-11
- B. R-12
- C. R-22
- D. Ammonia Discuss
- 5. The pressure measured with the help of a piezometer tube is in
Options- A. N/mm2
- B. N/m2
- C. head of liquid
- D. all of these Discuss
- 6. The width of cutting edge of a parting-off tool varies from
Options- A. 3 to 12 mm
- B. 5 to 20 mm
- C. 8 to 30 mm
- D. 15 to 40 mm Discuss
- 7. Cast iron is manufactured in
Options- A. blast furnace
- B. cupola
- C. open hearth furnace
- D. bessemer converter Discuss
- 8. For the same maximum pressure and heat input, the exhaust temperature of petrol engine is __________ than that of diesel engine.
Options- A. less
- B. more Discuss
- 9. The workdone on a compressor will be minimum if air is taken from
Options- A. the atmosphere
- B. a source at 0° C
- C. a source of low temperature air
- D. a source of high temperature air Discuss
- 10. A diamond pointed chisel is used for cutting
Options- A. flat surfaces
- B. grooves
- C. keyways
- D. V-shaped grooves Discuss
More questions
Correct Answer: hardening and cold working
Correct Answer: 4-speed gear box
Correct Answer: The body B is more stable than body A
Correct Answer: R-22
Correct Answer: head of liquid
Correct Answer: 3 to 12 mm
Correct Answer: cupola
Correct Answer: more
Correct Answer: a source of low temperature air
Correct Answer: V-shaped grooves
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