- (A) at which crystals first start forming from molten metal when it is cooled
- (B) at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
- (C) at which change of allotropic form takes place
- (D) at which crystals grow bigger in size
- (E) at which crystals are destroyed on heating
Mechanical Engineering Mcqs
- (A) room temperature
- (B) above melting point
- (C) between 1400°C and 1539°C
- (D) between 910°C and 1400°C
- (E) none of the above
- (A) below 10°K
- (B) above 100°K
- (C) around 0°C
- (D) around 100°C
- (E) above 1000°C
- (A) alpha iron, beta iron and gamma iron
- (B) alpha iron and beta iron
- (C) body centred cubic a-iron and face centred cubic a-iron
- (D) alpha iron, gamma from and delta iron
- (E) none of the above
- (A) room temperature
- (B) near melting point
- (C) between 1400°C and 1539°C
- (D) between 910°C and 1400°C
- (E) none of the above
- (A) 1539°C
- (B) 1601°C
- (C) 1489°C
- (D) 1712°C
- (E) 1131°C
- (A) copper
- (B) chromium
- (C) nickel
- (D) silicon
- (E) none of the above
- (A) high maehinability
- (B) low melting point
- (C) high tensile strength
- (D) good fluidity
- (E) all of the above
- (A) austenite
- (B) martensite
- (C) pearlite
- (D) cementite
- (E) all of the above
- (A) improves wear resistance, cuttinability and toughness
- (B) refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties
- (C) improves cutting ability and reduce hardenability
- (D) gives ductility, toughness, tensile strength and anti corrosion property:
- (E) none of the above
