QnA

18-4-1 high speed steel containts (A) vanadium 4% chromium 18% tungsten 1% (B) vanadium 1% chromium 4% tungsten 18% (C) vanadium 18% chromium 4% tungsten 1% (Answer: B)

Which of the following cutting tool has highest hot hardness? (A) Ceramics (B) Cast alloys (C) High-speed steels (D) Carbon tool steel (Ans: [A] Ceramics)

In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then the tool life will become (A) Half (B) Two times (C) Eight times (D) Sixteen times (Ans: D Sixteen times)

nikel when added to cooper improves (A) Machinability (B) Hardness (C) Strength (Ans : B)

Which of the following is hardest known material? (A) Cemented carbide (B) Ceramics (C) Cubic boron nitride (CBN) (D) Diamond (Ans : D)

Corrundum is a/an (A) Diamond (B) Abrasive (C) Ceramic (D) None of the above (Ans: B)

Which of the following tools are generally manufactured by Powder metallurgy? (A) Low carbon steel (B) Abrasives (C) High carbon steel (D) Cemented carbides (Ans: D)

The ascending order of evolution of materials used for making the cutting tools is (A) bronze – stone – steel – iron (B) iron – steel – bronze – stone  (C) stone – bronze – iron – steel (D) bronze – stone – steel – iron (Ans : C)

Find the number of pairs of natural numbers with as 56. (a) 3 (b) 4 (c) 10 (d) Can’t be determined Answer: [c] 10

When N is divided by 4, the remainder is 3 . What is the remainder when 2N is divided by 4 (a) 2 (b) 3 (c) 4 (d) 8 Answer: [a] 2