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Chemical Engineering - Chemical Engineering Basics

Exercise : Chemical Engineering Basics - Section 7
41.
Preheating prior to welding is done for the purpose of
decreasing cooling rate.
facilitating fusion of high melting metals.
preventing hot cracking.
ensuring full penetration.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
Presence of sulphur in steel reduces the
hardness.
grain size.
tensile strength.
toughness & transverse ductility.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
Cresylic acid
Xanthaies
Pine oil
all 'a' 'b' & 'c'
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
volume
pressure
heat
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
Fire on fuel oil lines can be extinguished by
foam
steam
water
carbon dioxide
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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