Chemical Engineering Basics

Question: All radiations falling on a black body are
[A].

refracted

[B].

reflected

[C].

transmitted

[D].

absorbed

Answer: Option D

Explanation:

No answer description available for this question.

Question: Electrochemical corrosion occurs
[A].

where the liquid electrolytes containing free ions are present.

[B].

only in alloys.

[C].

only in pure metals.

[D].

due to direct chemical action of metal with oxygen.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Corrosion rate can not be lowered by reducing the __________ of the corroding medium.
[A].

concentration

[B].

velocity

[C].

temperature

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Dezincification is a form of corrosion, which specifically applies to
[A].

steel

[B].

brass

[C].

stainless steel

[D].

babbit metal

Answer: Option B

Explanation:

No answer description available for this question.

Question: Laser is a device to produce
[A].

gamma rays.

[B].

microwaves.

[C].

a beam of white light.

[D].

a beam of coherent light.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Diffusion co-efficient of a metal in a solid solution depends upon its
[A].

composition

[B].

temperature

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: With increase in impurities in metals, their corrosion resistances
[A].

increase

[B].

decrease

[C].

remain same

[D].

may increase or decrease ; depending on the type of metal

Answer: Option B

Explanation:

No answer description available for this question.

Question: Absorptivity of a grey body varies with the
[A].

wavelength of the incident ray.

[B].

temperature

[C].

both’a’ & ‘b’

[D].

neither ‘a’ nor ‘b’

Answer: Option D

Explanation:

No answer description available for this question.

Question: Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.
[A].

decreases

[B].

increases

[C].

remains same

[D].

may increase or decrease

Answer: Option A

Explanation:

No answer description available for this question.

Question: Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
[A].

wet bulb

[B].

dry bulb

[C].

saturation

[D].

dew point

Answer: Option A

Explanation:

No answer description available for this question.