The surface hardness of the following order is achieved by nitriding operation__________________?

A. 600 VPN
B. 1500 VPN
C. 1000 to 1100 VPN
D. 250 VPN

Weld decay is the phenomenon found with _________________?

A. Cast iron
B. Mild steel
C. Stainless steel
D. Wrought iron

Hardness of upper bainite (acicular structure) is about___________________?

A. Rc 65
B. Rc 48
C. Rc 57
D. Rc 80

Brass (alloy of copper and zinc) is an example of__________________?

A. Substitutional solid solution
B. Interstitial solid solution
C. Intermetallic compounds
D. All of the above

Argentite is the principal ore or raw material for _________________?

A. aluminium
B. tin
C. zinc
D. lead

Amorphous material is one___________________?

A. In which atoms align themselves in a geometric pattern upon solidification
B. In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C. Which is not attacked by phosphorous
D. Which emits fumes on melting

Which is false statement about normalizing. Normalizing is done to _________________?

A. Refine grain structure
B. Reduce segregation in casting
C. Improve mechanical properties
D. Induce stresses-

Which is false statement about case hardening. Case hardening is done by_______________?

A. Electroplating
B. Cyaniding
C. Induction hardening
D. Nitriding

An example of amorphous material is____________?

A. Zinc
B. Lead
C. Silver
D. Glass

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