Engineering Materials
Induction hardening is the process of

Hardening surface of work-piece to obtain hard and wear resistant surface
Inducing hardness by continuous process
Heating and cooling rapidly
Increasing hardness throughout

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature
Stages at which allotropic forms change
There is nothing like points of arrest
Stages at which further heating does not increase temperature for some time

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Y-alloy contains

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Pick up wrong statement about wrought iron

It melts at 1535°C
It is very soft and ductile
It contains carbon of the order of 0 to 0.25%
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

ANSWER DOWNLOAD EXAMIANS APP