1161. High speed steel tools retain their hardness upto a temperature of __________ °C.
A. 500
B. 750
C. 900
D. 1100
✅ The correct answer is option C.
Engineering
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1162. When metals are heated to high temperature, their __________ increases in general.
A. Atomic vibration
B. Creep strength
C. Yield stress & ultimate tensile strength
D. Toughness & stiffness
✅ The correct answer is option A.
1163. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
A. Length of the pipe
B. Diameter of the pipe
C. Density of the fluid
D. Velocity of the fluid
✅ The correct answer is option A.
1164. Electrostatic separation of minerals from each other is based on their differences in the following property.
A. Densities
B. Magnetic permeabilities
C. Electrical conductivities
D. Hardness
✅ The correct answer is option C.
1165. Which of the following alloying elements is present in maximum percentage in high speed steel.
A. Molybdenum
B. Chromium
C. Tungsten
D. Vanadium
✅ The correct answer is option A.
1166. __________ is not a heat treatment process.
A. Cyaniding
B. Pakerising
C. Austempering
D. Martempering
✅ The correct answer is option B.
1167. Ceramic materials are
A. Organic in nature
B. Stronger in compression than in tension
C. Always amorphous in nature
D. Always bad heat conductors
✅ The correct answer is option B.
1168. Thermal efficiency of an internal combustion engine is around __________ percent.
A. 8
B. 35
C. 65
D. 80
✅ The correct answer is option B.
1169. Dew point temperature always gives an indication of the __________ of the moist air.
A. Dryness
B. Moisture content
C. Coolness
D. Latent heat
✅ The correct answer is option B.
1170. 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.