High speed steel tools retain their hardness upto a temperature of _____________ °C?
High speed steel tools retain their hardness upto a temperature of _____________ °C?
A. 500
B. 750
C. 900
D. 1100
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Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower_________________?
Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower_________________?A. Price
B. Corrosion resistance
C. Thermal conductivity
D. Abundant availabilityIron rust is
Question: Iron rust is
[A].ferrous oxide. [B].
hydrated ferric oxide. [C].
powdered iron. [D].
ferric sulphide. Answer: Option B
Explanation:
No answer description available for this question.
German silver used for decorative purposes contains maximum percentage of___________________?
German silver used for decorative purposes contains maximum percentage of___________________?A. Silver
B. Copper
C. Zinc
D. NickelSulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with__________________?
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with__________________?A. Acidic refractory
B. Rubber
C. Karbate
D. Lead or acid-proof bricksGraphite is corroded by
Question: Graphite is corroded by
[A].sulphuric acid (10%) [B].
sea water [C].
hydrochloric acid [D].
none of these Answer: Option D
Explanation:
No answer description available for this question.
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C ?
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C ?A. Silicone rubber, teflon, porcelain and wood
B. Nickel, monel, stainless steel and graphite
C. Aluminium, copper, high silicon iron
D. Brass, cast iron, mild steel and tin