161. Which of the following is not categorised as the ore agglomeration process?
A. Nodulising
B. Pelletising
C. Balling
D. Briquetting
✅ The correct answer is option C.
Engineering
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162. Powder metallurgy technique is used in the production of __________ tools.
A. Tungsten carbide
B. High carbon steel
C. High speed steel
D. Drilling
✅ The correct answer is option A.
163. Silicon in steel
A. Makes it usable in almost all magnetic circuits where alternating current is used
B. Increases its electrical resistivity and decreases the hysteresis loss
C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
D. All of the above
✅ The correct answer is option D.
164. Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C.
A. -30.5
B. -78.5
C. -183.5
D. -10.5
✅ The correct answer is option B.
165. __________ the exhaust gas is an indication of the incomplete combustion of fuel.
A. Low temperature of
B. High temperature of
C. High % of CO in
D. High % of CO₂ in
✅ The correct answer is option C.
166. Which of the following is not an ore of copper?
A. Cryolite
B. Azurite
C. Chalcopyrite
D. Malachite
✅ The correct answer is option A.
167. The delivery pressure of boiler feed water pump compared to the boiler steam pressure is
A. Same
B. Slightly less
C. Slightly more
D. Much more
✅ The correct answer is option C.
168. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
A. A
B. D
C. 1/A
D. 1/A²
✅ The correct answer is option C.
169. Welded joint is superior to revetted joint in respect of ease of fabrication, weight and strength. Which of the following joints is the most suitable for pipes carrying fluids under high pressure and temperature?
A. Flanged joint
B. Expansion joint
C. Bell and spigot joint
D. None of these
✅ The correct answer is option B.
170. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
A. Nickel
B. Vanadium
C. Molybdenum
D. Chromium
✅ The correct answer is option A.