Chemical Engineering Basics - Study Mode
[#586] A suitable lubricant used for watches is
Correct Answer
(D) Hazel-nut oil
[#587] The approximate height of a blast furnace having a useful volume of 2000 m 3 is about __________ metres
Correct Answer
(C) 55
Explanation
Solution: In chemical engineering, the approximate height of a blast furnace can be estimated based on its useful volume. A commonly used estimation is that the height of a blast furnace is approximately 10 to 30 times its useful volume. Given that the useful volume of the blast furnace is 2000 m 3 , we can estimate the height as follows: Height ≈ 10 to 30 * Volume Taking the average value (20 times the volume) for estimation: Height ≈ 20 * 2000 m 3 Height ≈ 40000 m 3 Therefore, the approximate height of the blast furnace is 55 metres , which is closest to Option C.
[#588] Materials used for making permanent magnets containing iron and nickel are made by __________ technique.
Correct Answer
(C) Forging
[#589] Tempering of a material does not improve its
Correct Answer
(A) Machinability
[#590] In age-hardenable alloys, maximum ductility is obtained
Correct Answer
(C) After optimum ageing