Question 1. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
9:1
17 : 1
23 : 1
29 : 1
Answer: Option B
Question 2. Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
SiO₂
Al2O₃
MnO₂
P
Answer: Option A
Question 3. Lime contains about 90% CaO. Percentage CaO present in limestone is about
25
50
70
80
Answer: Option B
Question 4. A cylinderical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is
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