Q. Silicon when added to copper increases its

  • (A) Brittleness
  • (B) Malleability
  • (C) Electrical conductivity
  • (D) Hardness
πŸ’¬ Discuss
βœ… Correct Answer: (D) Hardness

Q. Local hardening of steel can be done by all of the following EXCEPT

  • (A) flame hardening
  • (B) stepped uniform heating
  • (C) resistance heating
  • (D) Low specific heat of quenching oil
πŸ’¬ Discuss
βœ… Correct Answer: (A) flame hardening

Q. Which of the following structure is least hard?

  • (A) Pearlite
  • (B) Presence of cementite
  • (C) Martensite
  • (D) Sorbite
πŸ’¬ Discuss
βœ… Correct Answer: (A) Pearlite

Q. Highest specific gravity is of

  • (A) Titanium
  • (B) Copper
  • (C) Lead
  • (D) Steel
πŸ’¬ Discuss
βœ… Correct Answer: (C) Lead

Q. In which process steel is heated below the critical temperature

  • (A) Temperting
  • (B) Hardening
  • (C) Carburizing
  • (D) Annealing
πŸ’¬ Discuss
βœ… Correct Answer: (A) Temperting

Q. Under identical values of cold and hot junction temperatures which thermocouple given the highest output

  • (A) Iron constantan
  • (B) All give equal output
  • (C) Nickel nimo
  • (D) Chromel-constantan
πŸ’¬ Discuss
βœ… Correct Answer: (D) Chromel-constantan

Q. In tool steel the sulphur content is usually not allowed to exceed

  • (A) 3.5 percent
  • (B) 0.035 percent
  • (C) 5 percent
  • (D) 0.001 percent
πŸ’¬ Discuss
βœ… Correct Answer: (B) 0.035 percent

Q. Which of the following material is not used for cyaniding?

  • (A) Sodium carbonate
  • (B) Sodium chloride
  • (C) Sodium hydroxide
  • (D) Sodium cyanide
πŸ’¬ Discuss
βœ… Correct Answer: (C) Sodium hydroxide

Q. The number of atoms per unit cell in BCC is

  • (A) 8
  • (B) 9
  • (C) 3
  • (D) 6
πŸ’¬ Discuss
βœ… Correct Answer: (B) 9

Q. As per IS code, C 65 steel will have carbon percentage of

  • (A) 0.065 percent
  • (B) 0.6 to 0.7 percent
  • (C) 6 to 7 percent
  • (D) 00 to 70 percent
πŸ’¬ Discuss
βœ… Correct Answer: (B) 0.6 to 0.7 percent

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