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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?

A (ΔT)1/4

B (ΔT)1/2

C (ΔT)5/4

D (ΔT)3/4

Review Detailed Answer

Correct Answer: (ΔT)3/4

Heat transfer occurs by natural convection because change in temperature causes difference in__________________?

A Viscosity

B Density

C Thermal conductivity

D Heat capacity

Review Detailed Answer

Correct Answer: Density

A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m3 and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m2.K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is_________________?

A 555

B 55.5

C 0.55

D 0.15

Review Detailed Answer

Correct Answer: 0.15

The ratio of momentum diffusivity to thermal diffusivity is the ______________ number?

A Prandtl

B Nusselt

C Stanton

D Grashoff

Review Detailed Answer

Correct Answer: Prandtl

What is the thermal conductivity of a perfect heat insulator ?

A Zero

B One

C ∞

D Between 0 and ∞

Review Detailed Answer

Correct Answer: Zero

The value of Stefan-Boltzmann constant in SI unit is_________________?

A 5.6697 × 10-8W/m2.°K4

B 0.1714 × 10-8W/m2.°K4

C 5.6697 × 10-8kcal/m2. °K4

D 0.1714 × 10-8kcal/m2. °K4

Review Detailed Answer

Correct Answer: 5.6697 × 10-8W/m2.°K4

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?

A 5.6

B 0.025

C 3.5

D 0.0035

Review Detailed Answer

Correct Answer: 0.025

Air is best heated with steam in a heat exchanger of__________________?

A Plate type

B Double pipe type with fin on steam side

C Double pipe type with fin on air side

D Shell and tube type

Review Detailed Answer

Correct Answer: Double pipe type with fin on air side

Which is the most suitable for the concentration of foamy & frothy liquors ?

A Agitated film evaporator

B Long tube vertical evaporator

C Open pan evaporator

D None of these

Review Detailed Answer

Correct Answer: Long tube vertical evaporator

The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?

A 1000

B 727

C 800

D 1200

Review Detailed Answer

Correct Answer: 1000

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?

Heat transfer occurs by natural convection because change in temperature causes difference in__________________?

The ratio of momentum diffusivity to thermal diffusivity is the ______________ number?

What is the thermal conductivity of a perfect heat insulator ?

The value of Stefan-Boltzmann constant in SI unit is_________________?

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?

Air is best heated with steam in a heat exchanger of__________________?

Which is the most suitable for the concentration of foamy & frothy liquors ?

The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?