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- Question
A steel containing 16 to 18% chromium and about 0.12% carbon is called
Options- A. ferritic stainless steel
- B. austenitic stainless steel
- C. martensitic stainless steel
- D. nickel steel
- Correct Answer
- ferritic stainless steel
- 1. The use of heat exchangers is made in
Options- A. radiators in automobile
- B. condensers and boilers in steam plants
- C. condensers and evaporators in refrigeration and air conditioning units
- D. all of the above Discuss
- 2. The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
Options- A. remains constant
- B. decreases
- C. increases Discuss
- 3. A round nose tool may be fed eitner from left to right end or from right to left end of the lathe bed.
Options- A. Yes
- B. No Discuss
- 4. The ratio of the workdone on the blades to the energy supplied to the blades, is called
Options- A. blading efficiency
- B. nozzle efficiency
- C. gross or stage efficiency
- D. mechanical efficiency Discuss
- 5. The sparking in a petrol engine increases pressure and temperature of the products of combustion, but the volume remains constant.
Options- A. Yes
- B. No Discuss
- 6. The hydraulic efficiency of an impulse turbine is the
Options- A. ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
- B. ratio of the actual work available at the turbine to the energy imparted to the wheel
- C. ratio of the work done on the wheel to the energy of the jet
- D. none of the above Discuss
- 7. Which of the following inpurity in cast iron makes it hard and brittle?
Options- A. Silicon
- B. Sulphur
- C. Manganese
- D. Phosphorus Discuss
- 8. In a simple bending of beams, the stress in the beam varies
Options- A. linearly
- B. parabolically
- C. hyperbolically
- D. elliptically Discuss
- 9. Coefficient of friction depends upon
Options- A. area of contact only
- B. nature of surface only
- C. both (a) and (b)
- D. none of these Discuss
- 10. If clearance volume of I.C. engines is increased, the compression ratio will
Options- A. increase
- B. decrease
- C. remain constant
- D. be doubled Discuss
More questions
Correct Answer: all of the above
Correct Answer: remains constant
Correct Answer: Yes
Correct Answer: blading efficiency
Correct Answer: Yes
Correct Answer: ratio of the work done on the wheel to the energy of the jet
Correct Answer: Sulphur
Correct Answer: linearly
Correct Answer: nature of surface only
Correct Answer: decrease
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