614. Volumetric composition of flue gas analysed with the Orsat apparatus is : COâ‚‚ = 12%, Oâ‚‚ = 8%, CO = nil, Nâ‚‚ = 80%. This flue gas composition indicates that

A. Pure oxygen has been used for combustion
B. Nitrogen percentage in the fuel is very high
C. Excess air has been used for combustion
D. Hydrogen is not present in the fuel
✅ The correct answer is option C.

617. Often earing defects are found during deep drawing operation, because the

A. Surface finish of the sheet is poor
B. Sheet material has been given substantial spring back
C. Starting sheet has planer anisotropy due to its texture
D. Starting sheet has normal anitropy due to its texture
✅ The correct answer is option C.