341. Addition of silicon to aluminium improves its
A. Corrosion resistance
B. Machinability
C. Castability
D. None of these
✅ The correct answer is option C.
Chemical Engineering
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342. Fatigue strength of a metal is improved by
A. Overstressing
B. Scratching the surface
C. Raising the temperature
D. Understressing
✅ The correct answer is option D.
343. Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
A. H
B. H/2
C. H/4
D. H/6
✅ The correct answer is option D.
344. Cast iron contains __________ percent carbon.
A. 2.5
B. 3.75
C. 4.75
D. 5.25
✅ The correct answer is option A.
345. Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.
A. Joule
B. Carnot
C. Rankine
D. Brayton
✅ The correct answer is option C.
346. Eutectoid composition of carbon steel at room temperature is
A. Cementite
B. Pearlite
C. Martensite
D. Ferrite
✅ The correct answer is option B.
347. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
A. Tension
B. Shear
C. Compression
D. Bending & tension
✅ The correct answer is option A.
348. Normalising of a casting does not
A. Induce stresses in it
B. Refine its grain structure
C. Reduce seggregation
D. Improve its mechanical properties
✅ The correct answer is option A.
349. All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.
A. Deuterium
B. Hydrogen
C. Neon
D. Helium
✅ The correct answer is option B.
350. For separating small pieces of metal from engine oil of a car, the best separating technique is the
A. Chromatography
B. Evaporation
C. Filtration
D. Fractional distillation
✅ The correct answer is option C.