Question: Alloying elements present in Hayness stel-lite, which has superior performance than high speed steel, are
[A].

nickel, cobalt & chromium.

[B].

tungsten, chromium & cobalt.

[C].

manganese, chromium & cobalt.

[D].

tungsten, molybdenum & nickel.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Out of the following, the most melleable material is
[A].

copper

[B].

aluminium

[C].

wrought iron

[D].

lead

Answer: Option D

Explanation:

No answer description available for this question.

Question: Out of the following, the most ductile material is
[A].

mild steel

[B].

copper

[C].

nickel

[D].

aluminium

Answer: Option A

Explanation:

No answer description available for this question.

Question: Diamagnetic materials
[A].

are magnetised by eddy currents only.

[B].

are non-magnetic and can not be magnetised.

[C].

are magnetised in direction opposite to the magnetic field.

[D].

can be magnetised in one direction only.

Answer: Option C

Explanation:

No answer description available for this question.

Question: About __________ ton of coke is required in a cupola to produce one ton of casting.
[A].

0.03

[B].

0.3

[C].

0.8

[D].

1.5

Answer: Option B

Explanation:

No answer description available for this question.

Question: Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
[A].

white

[B].

cast

[C].

wrought

[D].

pig

Answer: Option C

Explanation:

No answer description available for this question.

Question: Lowering of recrystallisation temperature of metals can be achieved by its
[A].

grain refinement.

[B].

purification.

[C].

working at lower temperature.

[D].

all a, b & c.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Main alloying element in Elinvar used in precision instruments, hair springs for watches etc. is
[A].

chromium

[B].

nickel

[C].

zinc

[D].

aluminium

Answer: Option B

Explanation:

No answer description available for this question.

Question: Addition of silicon to aluminium improves its
[A].

corrosion resistance

[B].

machinability

[C].

castability

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.