261. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?
A. Zirconia
B. Alumina
C. Bakelite
D. Tungsten carbide
✅ The correct answer is option D.
Engineering
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262. Glycerene is used as a coolant in cooling of some engines instead of water, because
A. Its higher boiling point (290°C) increases its heat carrying capacity
B. Compartively less weight of coolant is required
C. Smaller radiator can be used
D. All of the above
✅ The correct answer is option D.
263. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg) ?
A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas
✅ The correct answer is option D.
264. A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
A. The better insulation material should be put just next to pipe (i.e., inside)
B. The better insulating material should be put outside
C. Either of the insulating material could be put on either side
D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
✅ The correct answer is option A.
265. The surface tension of a liquid, at critical temperature is
A. Indeterminate
B. Zero
C. Infinity
D. Same as that at any other temperature
✅ The correct answer is option B.
266. Out of the following materials, the one which generally exhibits an yield point is
A. Hard bronze
B. Soft brass
C. Cold rolled mild steel
D. Hot rolled mild steel
✅ The correct answer is option D.
267. The moment of inertia of a body comes into play in __________ motion.
A. Curvilinear
B. Linear
C. Rotational
D. None of these
✅ The correct answer is option C.
268. Improvement in mechanical properties of metals in its hot working is due to the grains
A. Recrystallisation
B. Refinement
C. Growth
D. Recovery
✅ The correct answer is option B.
269. Out of the following, __________ pipe is the least corrosion resistant.
A. Mild steel
B. Copper
C. Wrought iron
D. Stainless steel
✅ The correct answer is option C.
270. An approximately __________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section.
A. Adiabatic
B. Isothermal
C. Isentropic
D. Isochoric
✅ The correct answer is option B.