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Chemical Engineering Basics

__________ the exhaust gas is an indication of the incomplete combustion of fuel.

Question: __________ the exhaust gas is an indication of the incomplete combustion of fuel.
[A].

Low temperature of

[B].

High temperature of

[C].

High % of CO in

[D].

High % of CO2 in

Answer: Option C

Explanation:

No answer description available for this question.

__________ the exhaust gas is an indication of the incomplete combustion of fuel. Read More »

CHEMICAL ENGINEERING, Chemical Engineering Basics

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is

Question: Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
[A].

very low which prevents their ignition by compression.

[B].

very high which prevents their ignition by compression

[C].

zero.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is Read More »

CHEMICAL ENGINEERING, Chemical Engineering Basics

Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is

Question: Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is
[A].

3

[B].

5

[C].

0.5

[D].

1.5

Answer: Option B

Explanation:

No answer description available for this question.

Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is Read More »

CHEMICAL ENGINEERING, Chemical Engineering Basics

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.

Question: Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.
[A].

15

[B].

25

[C].

10

[D].

30

Answer: Option B

Explanation:

No answer description available for this question.

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm. Read More »

CHEMICAL ENGINEERING, Chemical Engineering Basics

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is

Question: In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
[A].

less

[B].

more

[C].

equal

[D].

unpredictable

Answer: Option A

Explanation:

No answer description available for this question.

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is Read More »

CHEMICAL ENGINEERING, Chemical Engineering Basics

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

Question: In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
[A].

compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.

[B].

maintaining vacuum on tube side is more difficult than that on the shell side.

[C].

water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.

[D].

condenser can act as a storage unit for condensed steam.

Answer: Option C

Explanation:

No answer description available for this question.

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that Read More »

CHEMICAL ENGINEERING, Chemical Engineering Basics

In radiative heat transfer, a grey surface is the one, which has

Question: In radiative heat transfer, a grey surface is the one, which has
[A].

emissivity independent of wavelength.

[B].

grey appearance to the eye.

[C].

zero reflectivity.

[D].

equal brightness in all directions.

Answer: Option A

Explanation:

No answer description available for this question.

In radiative heat transfer, a grey surface is the one, which has Read More »

CHEMICAL ENGINEERING, Chemical Engineering Basics