An example of amorphous material is____________?
A. zinc
B. lead
C. silver
D. glass
E. brass
Engineering Materials
Which is false statement about case hardening. Case hardening is done by_______________?
Which is false statement about case hardening. Case hardening is done by_______________?
A. electroplating
B. cyaniding
C. induction hardening
D. nitriding
E. flame hardening
Chromium in steel_________________?
Chromium in steel_________________?
A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. makes steel hard
Cemented carbide tools are not found to be suitable for cutting_______________?
Cemented carbide tools are not found to be suitable for cutting_______________?
A. brass
B. cast iron
C. aluminium
D. steel
E. non-ferrous alloys.
Which of the following is the binding material in cemented carbides___________________?
Which of the following is the binding material in cemented carbides___________________?
A. cobalt
B. nickel
C. vanadium
D. iron
E. carbon
Which is false statement about tempering. Tempering is done to_______________?
Which is false statement about tempering. Tempering is done to_______________?
A. improve machinability
B. improve ductility
C. improve toughness
D. release stresses
E. reduce hardness and brittleness
Vanadium in high speed steels__________________?
Vanadium in high speed steels__________________?
A. promotes decarburisation
B. provides high hot hardness
C. forms very hard carbides and thus in-creases wear resistance
D. promotes retention of austenite
E. increases toughness
Hardness of lower bainite (tempered martensite) is about________________?
Hardness of lower bainite (tempered martensite) is about________________?
A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32
Which is false statement about annealing. Annealing is done to________________?
Which is false statement about annealing. Annealing is done to________________?
A. relieve stresses
B. harden steel slightly
C. improve machining characteristic
D. soften material
E. permit further cold working
Carbon in iron is an example of__________________?
Carbon in iron is an example of__________________?
A. substitutional solution
B. interstitial solid solution
C. intermetallic compounds
D. all of the above
E. none of the above.