351. Absorptivity of a grey body varies with the
A. Wavelength of the incident ray
B. Temperature
C. Both A & B
D. Neither A nor B
✅ The correct answer is option D.
Engineering
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352. Nitrogen compounds are not used in the manufacture of
A. Fertilisers
B. Gun powder
C. Tip of match sticks
D. Explosive
✅ The correct answer is option C.
353. A common disinfectant used in village wells for disinfection of water is
A. Free chlorine
B. Bromine
C. Iodine
D. Potassium permanganate
✅ The correct answer is option D.
354. Springback in sheet metal bending depends on the
A. Elastic limit
B. Bend radius
C. Degree of bend
D. Thickness of sheet
✅ The correct answer is option D.
355. A reduction in thermal resistance during heat transfer does not occur in the
A. Convection heat transfer by stirring the fluid and cleaning the heating surface
B. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
C. Radiation heat transfer by increasing the temperature and reducing the emis-sivity
D. None of these
✅ The correct answer is option C.
356. Maximum carbon content in cast iron is __________ percent.
A. 3.8
B. 4
C. 4.3
D. 4.6
✅ The correct answer is option C.
357. Air-petrol ratio for maximum power generation in spark ignition engine is about
A. 6:1
B. 12 : 1
C. 18 : 1
D. 24 : 1
✅ The correct answer is option B.
358. Surface finish of casting does not depend upon the
A. Sand fineness
B. Pattern finish
C. Mould dressings
D. Metal temperature
✅ The correct answer is option D.
359. Lubricants can be used to
A. Transmit power hydraulically
B. Form a seal in compressors
C. Remove contaminants by flushing and to insulate transformers, switchgears etc
D. All of the above
✅ The correct answer is option D.
360. High endurance limit of carburised machine parts is because of the fact that carburisation
A. Suppresses any stress concentration produced in the parts
B. Enhances the yield point of the material
C. Introduces a compressive layer on the surface
D. Produces a better surface finish
✅ The correct answer is option C.