Material Science (Heat Treatment)

1. Which one of the following is not equilibrium heat treatment
(1) Austenetising
(2) Annealing
(3) Normalizing
(4) Precipitation
(4)
2. The hardenability is not affected by
(1) air
(2) chemical composition of steel
(3) critical cooling rate
(4) quenching medium and method of quenching
(1)
3. The slowest cooling rate is obtained when steel is quenched in
(1) air
(2) brine
(3) fused salt
(4) mixture of oil and water (1)

4. The fastest cooling rate is achieved when steel is quenched in
(1) air
(2) oil
(3) water
(4) brine
(4)
5. Which one of the following is not correct
(1) Martensite has a BCC structure
(2) Austenite has FCC structure
(3) Martensite is a solid solution of carbon in BCC iron
(4) The martensite which is formed during quenching is too brittle
(1)
6. Hardenability of steel is assessed by
(1) impact test
(2) Jominy end-quench test
(3) hardness test
(4) non-destructive test
(2)
7. Annealing temperature is
(1) same as normalizing temperature
(2) greater than normalizing temperature
(3) less than normalizing temperature
(4) sometimes greater and sometimes lesser than normalizing temperature
(3)
8. Heat treatment that requires heating a part below A1 temperature, i.e. between 550°C and 650° is
called as
(1) hardening
(2) normalizing
(3) process annealing
(4) full annealing

Subscribe
(3)

Comments

Popular posts from this blog

Electrical Machines (Three Phase Transformers)

Thermodynamics (Compressible Flow)

Electrical Machines (Special Machines)