Engineering Materials
Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc
Nickel, copper and iron
Copper, nickel and antimony
Iron, zinc and bismuth

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Aluminium bronze contains

10% aluminium and 90% copper
90% magnesium and 9% aluminium with some copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

ANSWER DOWNLOAD EXAMIANS APP