Discussion
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- Question
Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to
Options- A. cylinder walls being too hot
- B. overheated spark plug points
- C. red hot carbon deposits on cylinder walls
- D. any one of these
- Correct Answer
- any one of these
- 1. Otto cycle consists of
Options- A. two constant volume and two isentropic processes
- B. two constant pressure and two isentropic processes
- C. two constant volume and two isothermal processes
- D. one constant pressure, one constant volume and two isentropic processes Discuss
- 2. When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called
Options- A. wood charcoal
- B. bituminous coal
- C. briquetted coal
- D. none of these Discuss
- 3. The relative efficiency is defined as the
Options- A. ratio of thermal efficiency to 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
- 4. A perpetual motion machine of the first kind is __________ according to first law of thermodynamics.
Options- A. possible
- B. impossible Discuss
- 5. The discharge through a turbine is
Options- A. directly proportional to H1/2
- B. inversely proportional to H1/2
- C. directly proportional to H3/2
- D. inversely proportional to H3/2 Discuss
- 6. Tin base white metals are used where the bearings are subjected to
Options- A. large surface wear
- B. elevated temperatures
- C. light load and pressure
- D. high pressure and load Discuss
- 7. A refrigerant with the highest critical pressure is
Options- A. R-11
- B. R-12
- C. R-22
- D. Ammonia Discuss
- 8. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is
Options- A. tensile stress, tensile strain
- B. compressive stress, compressive strain
- C. shear stress, tensile strain
- D. shear stress, shear strain Discuss
- 9. Diesel cycle consists of __________ processes.
Options- A. two constant volume and two isentropic
- B. two constant pressure and two isentropic
- C. two constant volume and two isothermal
- D. one constant pressure, one constant volume and two isentropic Discuss
- 10. In a fire tube boiler, the water is contained inside the tubes which are surrounded by flames and hot gases from outside.
Options- A. True
- B. False Discuss
More questions
Correct Answer: two constant volume and two isentropic processes
Correct Answer: none of these
Correct Answer: ratio of thermal efficiency to Rankine efficiency
Correct Answer: impossible
Correct Answer: directly proportional to H1/2
Correct Answer: large surface wear
Correct Answer: Ammonia
Correct Answer: shear stress, shear strain
Correct Answer: one constant pressure, one constant volume and two isentropic
Correct Answer: False
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