1109. In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be
A. Conduction
B. Radiation
C. Natural convection
D. Forced convection
✅ The correct answer is option B.
1112. Which of the following is the most wear resistant grade of carbide used for the cutting tools?
A. Aluminium carbide
B. Tungsten carbide
C. Nickel carbide
D. Iron carbide
✅ The correct answer is option B.
1068. Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be
A. More
B. Less
C. Same
D. Either more or less; depends on the climatic conditions
✅ The correct answer is option B.
1071. The approximate height of a blast furnace having a useful volume of 2000 m³ is about __________ metres
A. 25
B. 35
C. 55
D. 75
✅ The correct answer is option C.
1074. Which of the following is an acidic constituent of B.F. slag ?
A. SiO₂
B. FeO
C. MgO
D. CaO
✅ The correct answer is option A.
1077. The dimensions of Planck’s constant is the same as that of the
A. Kinetic energy
B. Momentum
C. Electrostatic potential
D. None of these
✅ The correct answer is option D.
1080. Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
A. Steel
B. Lignite
C. Water
D. Lime stone
✅ The correct answer is option C.
1083. In age-hardenable alloys, maximum ductility is obtained
A. In as cast state
B. Immediately after solution treatment and subsequent quenching
C. After optimum ageing
D. After overageing
✅ The correct answer is option C.
1086. Most of the phosphorous present in the blast furnace burden enters into
A. Hot metal
B. Flue gases
C. Slag
D. Refractory lining
✅ The correct answer is option A.
1089. Laser welding is widely employed in the __________ industries.
A. Electronic
B. Structural
C. Process
D. Heavy
✅ The correct answer is option A.