DSSSB Tool & Die Maker Instructor Paper 2014

DSSSB Tool & Die Maker Instructor Paper 2014

Gamma iron exits at following temperature
(a) room temperature
(b) between 1400 to 1539 Degree celcius
(c) between 910 to 1400 degree Celcius
(d) None of the above

Pearlite contains following percentage of carbon
(a) 0.02%
(b) 0.3%
(c) 0.63%
(d) 0.8%

Soft solder is an alloy of consisting of
(a) tin and lead
(b) lead and zinc
(c) tin, antimony, copper
(d) lead and copper

Melting point of pure iron is
(a) 1539 degree Celcius
(b) 1601 degree Celcius
(c) 1712 degree Celcius
(d) 1131 Degree Celcius

Aluminium bronze alloy
(a) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
(b) 92.5% aluminium, 4% copper, 2% Nickel and 1.5% Mg
(c) 10% aluminium and 90% copper
(d) None of the above

____________is produced by slow cooling of Hypereutectoid steel
(a) Pearlite alone
(b) Spheroidite
(c) Cementite
(d) Sorbite

Which of the following in a case hadening process ?
(a) Spherodising
(b) Tempering
(c) Shearadising
(d) Carburisation

The basic ingredient of cemented carbide is
(a) aluminium oxide
(b) vanadium
(c) ceramics
(d) tungsten

The imperfections in the crystal structure or lattice spacing of metal is called
(a) dislocation
(b) slip
(c) fracture
(d) impurity

Austenite is a combination of
(a) ferrite and cementite
(b) ferrite and austenite
(c) cementite and gamma iron
(d) pearlite and ferrite

The size of vice is specified by
(a) length of movable jaw
(b) width of the jaws
(c) height of the jaws
(d) maximum opening of the jaws

Scribers are made of
(a) bronze
(b) steel
(c) brass
(d) cast iron