11. Turning/machining of __________ usually does not require any cutting fluid.
A. Cast iron
B. Stainless steel
C. Mild steel
D. Copper
✅ The correct answer is option A.
Engineering
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12. Evaporative cooling process employs a combination of cooling and humidification in which the
A. Sensible heat is added
B. Sensible heat is removed and the latent heat is added
C. Latent heat is removed
D. Sensible heat is added and latent heat is removed
✅ The correct answer is option B.
13. Which of the following does not come under the category of electrochemical corrosion?
A. Corrosion in organic liquids
B. Atmospheric corrosion in moist gas or air
C. Soil corrosion as in the case of underground pipes
D. Corrosion in sea water and molten metals
✅ The correct answer is option A.
14. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the
A. Partial pressure of water vapour is less than the total pressure
B. Humidity is < 100% & dew point temperature of air has not reached
C. Dew point temperature of air has not reached & air is not saturated fully
D. Air is fully saturated
✅ The correct answer is option D.
15. Air-petrol ratio in an automotive petrol engine is around
A. 14 : 1
B. 22 : 1
C. 25 : 1
D. 4 : 1
✅ The correct answer is option A.
16. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m² of steel strip.
A. 5-10
B. 1000-1500
C. 120-500
D. 1500-3000
✅ The correct answer is option C.
17. Heat treatment of steel is done mainly to change its
A. Mechanical properties
B. Physical properties
C. Chemical composition
D. All of the above
✅ The correct answer is option A.
18. __________ strain gauge is the most sensitive sensing element for strain measurement.
A. Photoelastic
B. Semiconductor
C. Wire resistance
D. None of these
✅ The correct answer is option B.
19. Which is the only metal that exists in liquid state at room temperature?
A. Sodium
B. Mercury
C. Lithium
D. Strontium
✅ The correct answer is option B.
20. In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
A. 0.5
B. 1
C. 5
D. 20
✅ The correct answer is option C.