1229. Screws are specified by their __________ diameters.
A. Minor
B. Major
C. Pitch
D. None of these
✅ The correct answer is option B.
1230. In the Bayer’s process, bauxite is digested under pressure using
A. H₂SO₄
B. NaOH
C. NH₃
D. HCl
✅ The correct answer is option B.
1231. Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that
A. Cooling produces tension on the surface
B. Cooling produces compression on the surface
C. Heating does not produces any thermal stress
D. Heating produces compression on the surface
✅ The correct answer is option A.
1232. Paint spray gun works on the principle of
A. Bernoulli’s theorem
B. Boyle’s law
C. Newton’s law of viscosity
D. None of these
✅ The correct answer is option A.
1209. Compression ratio of an I.C. engine is the ratio of the
A. Clearance volume to the volume swept by piston per stroke
B. Volume of air in cylinder before compression to that after compression
C. Pressure after compression to that before compression
D. None of these
✅ The correct answer is option B.
1203. Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?
A. Airpreheater
B. Economiser
C. Steam superheater
D. Furnace water wall
✅ The correct answer is option A.
1206. The maximum axial compression stress during cold upsetting of a cylinderical rod of radius (r) occurs at
A. The outer edge of the rod
B. R/3 from the centre
C. R/2 from the centre
D. The centre
✅ The correct answer is option D.
1170. Classification of metal forming processes into hot and cold working is based on the following parameters.
A. Stacking fault energy
B. Recrystallisation temperature
C. Solidus temperature
D. Transformation temperature
✅ The correct answer is option B.
1173. Drills are usually made of
A. Cermets
B. High speed steel
C. Alloy steel
D. Tungsten carbide
✅ The correct answer is option B.
1176. Atomic __________ of an element is a whole number.
A. Weight
B. Number
C. Volume
D. Radius
✅ The correct answer is option B.