Q.1
How many types of hardening processes are commonly used?
  • a) 3
  • b) 5
  • c) 6
  • d) 7
Q.2
Which of the following is not the purpose of the surface hardening?
  • a) To improve wear resistance
  • b) To increase fatigue life
  • c) Prevention from cracking
  • d) To improve ductility
Q.3
How many surface hardening methods are there which are commonly used?
  • a) 2
  • b) 3
  • c) 4
  • d) 5
Q.4
Shot peening technique is applicable to all metals and alloys that are prone to _____
  • a) plastic deformation
  • b) brittle failure
  • c) fatigue failure
  • d) ductile deformation
Q.5
Which of the following is not subjected to shot peening?
  • a) Landing gears of an aircraft
  • b) Automotive gears
  • c) Shafts
  • d) Coil springs
Q.6
Which of the following is not the outcome of hard facing?
  • a) Improved resistance to particle erosion
  • b) Improved resistance to abrasion
  • c) Improved resistance to fretting
  • d) Improved resistance to plastic deformation
Q.7
Which of the following is the most commonly used coating materials for hard facing?
  • a) Mixture of chromium carbide and cobalt
  • b) Mixture of calcium nitrate and iron carbide
  • c) Mixture of copper oxide and zinc oxide
  • d) Mixture of boron carbide and vanadium pentoxide
Q.8
Induction hardening is used for _____
  • a) steels
  • b) aluminium alloys
  • c) copper alloys
  • d) zinc alloys
Q.9
During induction hardening, the microstructure of the surface gets transformed into _____
  • a) austenite
  • b) perlite
  • c) bainite
  • d) martensite
Q.10
Which of following is not the feature of induction hardening?
  • a) Heat the surface to a temperature above an austenitic region
  • b) Good surface finish
  • c) Fast heating & short hold time
  • d) Applicable to carbon steels having (0.8– 1% C)
Q.11
The hardness of steel depends only on the ______
  • a) carbon content
  • b) temperature
  • c) yield strength
  • d) tensile strength
Q.12
A major limitation of pack carburizing is poor control over_____
  • a) temperature
  • b) ductility
  • c) hardness
  • d) strength
Q.13
Which of the following is most commonly used as carburizing gas?
  • a) CH4
  • b) CO
  • c) N2
  • d) C2H2
Q.14
The main purpose of this stage is to harden the case consisting of austenite and globules of un‐dissolved carbide.
  • a) True
  • b) False
Q.15
The reasons for case hardening is to develop compressive residual stress.
  • a) True
  • b) False
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