MCQsDrive | MCQsDrive

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.

Which of the following is generally considered as opaque surface towards radiations ?

A Gases

B Solids

C Liquids

D Both B. and C.

Review Detailed Answer

Correct Answer: Both B. and C.

Fourier’s law of heat conduction applies to _____________ surfaces?

A Isothermal

B Non-isothermal

C Both A. and B.

D Neither A. and B.

Review Detailed Answer

Correct Answer: Both A. and B.

200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?

A 0.5

B 0.05

C 0.1

D 0.15

Review Detailed Answer

Correct Answer: 0.1

Harmonic mean temperature difference is given by_________________?

A √(ΔT1 . ΔT2)

B 2 (ΔT1 . ΔT2)/(ΔT1 + ΔT2)

C 2 (ΔT1 . ΔT2)/(ΔT1 – ΔT2)

D (ΔT1 – ΔT2)/(ΔT1 . ΔT2)

Review Detailed Answer

Correct Answer: 2 (ΔT1 . ΔT2)/(ΔT1 + ΔT2)

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?

A ha = hl

B ha = 2hl

C ha = 0.5 hl

D ha = 0.75 hl

Review Detailed Answer

Correct Answer: ha = 2hl

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

Showing 291 to 300 of 510 results

Contact Info

Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Which of the following is generally considered as opaque surface towards radiations ?

Fourier’s law of heat conduction applies to _____________ surfaces?

Harmonic mean temperature difference is given by_________________?

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?

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 ?