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. Work done in 8 free expansion process is
A) Zero B) Minimum
C) Negative D) Positive

. The crystal structure of aluminium is
A) Body centred cubic B) Face centred cubic
C) Close packed hexagonal D) Body centred tetragonal

3. Delta iron occurs in the temperature range of

A) Room temperature B) 600°C to melting point
C) 800°C to 1200°C D) 400°C to 1530°C

. The number of degree of freedom of an eutectic point in a binary system according
to Gibbs phase rule is
A) 0 B) 1 ௦) 2 D) 3

. Which one of the following is the process to refine the grains of metal after it has
been destroyed by cold working ?
A) Annealing B) Softening
C) Recrystalizing D) Normalizing

. The percentage of phosphorus in phosphor bronze is
A) 0.1 B) 1 ©) 11.1 0) 9.8

. Machining of copper can be improved by adding
A) Vanadium B) Sulphur
C) Tin D) Zinc

. The Jominy test is used to find
A) Young’s modulus B) Hardenability
C) Yield strength D) Thermal conductivity

. In the polytropic process pv" = constant, if the value of ‏م‎ is infinity, the process is
termed as
A) Constant volume B) Constant pressure
C) Constant temperature D) Adiabatic

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