A. -0.8
B. 0.8
C. +0.08
D. -0.24
✅ The correct answer is option D.
Engineering MCQs
In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be
A. ΔQ = 0, ΔS=0
B. ΔQ = 0 , ΔS = +ve
C. ΔQ = 0, ΔS = -ve
D. ΔQ = +ve , ΔS= +ve
✅ The correct answer is option B.
Cast iron compared to steel is better in
A. Ductility
B. Strength
C. Malleability
D. Fluidity & castability
✅ The correct answer is option D.
Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.
A. Burning
B. Intensive oxidation
C. Evaporation
D. None of these
✅ The correct answer is option B.
Screws are specified by their __________ diameters.
A. Minor
B. Major
C. Pitch
D. None of these
✅ The correct answer is option B.
α-rays are
A. Negatively charged
B. Positively charged
C. Neutral
D. Same as X-rays
✅ The correct answer is option B.
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.
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.
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.
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.