601. Annealing ofwhite cast iron produces __________ iron.
A. Grey
B. Nodular
C. Malleable
D. Spheroidal
✅ The correct answer is option C.
Engineering
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602. About __________ ton of coke is required in a cupola to produce one ton of casting.
A. 0.03
B. 0.3
C. 0.8
D. 1.5
✅ The correct answer is option B.
603. Which of the following is not a dielectric material?
A. Cotton, silk and paper
B. Asbestos, glass, porcelain and mica
C. Rubber and polymeric resins
D. All of the above
✅ The correct answer is option C.
604. Presence of sulphur in the fuel fired in a furnace
A. Contributes to its heating value
B. Helps in electrostatic precipitation of ash from flue gases
C. Corrodes ducts & air preheater, if the flue gas temperature is low
D. All of the above
✅ The correct answer is option D.
605. Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
A. Mach
B. Froude
C. Reynolds
D. Euler
✅ The correct answer is option A.
606. __________ is the hardest material out of the following.
A. Boron carbide
B. Tungsten carbide
C. Hardened steel
D. Silicon carbide
✅ The correct answer is option A.
607. Which of the following polymers is obtained by copolymerisation of three monomers?
A. SAN
B. ABS
C. SBR
D. PTFE
✅ The correct answer is option B.
608. Material of construction of foundary crucible is
A. Lead
B. Stainless steel
C. Graphite
D. Cast iron
✅ The correct answer is option C.
609. The order of a chemical reaction
A. Can be determined only experimentally
B. Can be determined from the stoichiometry of the reaction
C. Can not be zero
D. Can be fractional
✅ The correct answer is option B.
610. Which of the following is an example of cathodic protection of metals against corrosion ?
A. Painted steel
B. Galvanised iron
C. Case hardened steel
D. Lead lined reactor
✅ The correct answer is option B.