CHEMICAL ENGINEERING

Question: In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be
[A].

ΔQ = 0, ΔS=0

[B].

ΔQ = 0 , ΔS = +ve

[C].

ΔQ = 0, ΔS = -ve

[D].

ΔQ = +ve , ΔS= +ve

Answer: Option B

Explanation:

No answer description available for this question.

Question: Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is
[A].

R ln 2

[B].

-R ln 2

[C].

3 R ln 2

[D].

-3R ln 2

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
[A].

linearly

[B].

exponentially

[C].

logarithmically

[D].

inversely

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
[A].

increases.

[B].

decreases.

[C].

remains constant.

[D].

increases to a maximum before decreasing.

Answer: Option A

Explanation:

No answer description available for this question.

Question: For an ideal gas, Cp – Cv is
[A].

R

[B].

-R

[C].

0

[D].

(3/2) R

Answer: Option A

Explanation:

No answer description available for this question.

Question: In which of the following reactions, application of vacuum will help ?
[A].

Number of gas molecules in the product side is more than that on the reactant side.

[B].

Number of gas molecules in the reactant side is more than that on the product side.

[C].

Number of gas molecules are the same on both the reactant & the product side.

[D].

None of the above.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Often earing defects are found during deep drawing operation, because the
[A].

surface finish of the sheet is poor.

[B].

sheet material has been given substantial spring back.

[C].

starting sheet has planer anisotropy due to its texture.

[D].

starting sheet has normal anitropy due to its texture.

Answer: Option C

Explanation:

No answer description available for this question.

Question: A jet engine turbine blade is normally manufactured by
[A].

forging.

[B].

shell moulding.

[C].

investment casting.

[D].

pressure die casting.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In age-hardenable alloys, maximum ductility is obtained
[A].

in as cast state.

[B].

immediately after solution treatment and subsequent quenching.

[C].

after optimum ageing.

[D].

after overageing.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be
[A].

higher, as it gives higher wavelength.

[B].

lower, as it gives higher wavelength.

[C].

higher, as it gives shorter wavelength.

[D].

lower, as it gives shorter wavelength.

Answer: Option C

Explanation:

No answer description available for this question.