281. In an isochoric process,
A. There is no transfer of mass and energy
B. Free expansion of an ideal gas occurs
C. No mechanical work is done by the system
D. All of the above
✅ The correct answer is option C.
Engineering
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282. Which of the following is not an ore of iron?
A. Chalcopyrite
B. Magnetite
C. Hemetite
D. Limonite
✅ The correct answer is option A.
283. Which of the following alloying elements reduces the formation of iron sulphide in steel?
A. Cobalt
B. Nickel
C. Manganese
D. Vanadium
✅ The correct answer is option B.
284. When the weight of a ball inside the ball mill is just balanced by the centrifugal force,
A. The ball abandons its circular path for a parabolic path
B. The ball abandans its parabolic path for a circular path
C. The ball continues to move on a circular path
D. The ball continues to move on a parabolic path
✅ The correct answer is option A.
285. Permanent set in a material is produced by subjecting it to
A. Triaxial loading
B. Fatigue loading
C. Stresses beyond the elastic limit
D. Tensile & compressive loads simultaneously
✅ The correct answer is option C.
286. Pick out the wrong statement about powder metallurgy technique.
A. Powder metallurgy techniques are applied at room temperature
B. Final product in powder metallurgy is not necessarily metallic powder
C. The final product in powder metallurgy is made from metallic powder
D. Silver and nickel when melted together do not mix to form an alloy ; however alloy of these constituents can be made by powder metallurgy technique
✅ The correct answer is option A.
287. Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
A. Piercing
B. Spinning
C. Drawing
D. Extrusion
✅ The correct answer is option B.
288. Tin based white metals are used, where bearings are subjected to
A. High pressure & load
B. Low pressure & load
C. High temperature
D. Large surface wear
✅ The correct answer is option A.
289. The quantity of electricity required to deposit one gm equivalent of any substance is one
A. Ampere
B. Coulomb
C. Microfaraday
D. Faraday
✅ The correct answer is option D.
290. Out of the following surfaces, the emis-sivity will be minimum for
A. Aluminium foil
B. Concrete
C. Plaster
D. Smooth glass
✅ The correct answer is option B.