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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.

A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?

A 2

B 20.8

C 20.2

D 20.5

Review Detailed Answer

Correct Answer: 2

It is not preferable to use superheated steam in evaporators, because of its very_________________?

A High temperature

B High pressure

C Low film co-efficient

D None of these

Review Detailed Answer

Correct Answer: Low film co-efficient

_____________ heat exchanger is used for chilling oil to be dewaxed?

A U-tube

B Double pipe

C Fixed tube

D Floating head

Review Detailed Answer

Correct Answer: Double pipe

If heat transfer rate varies with the time, it is termed as__________________?

A Forced convection

B Steady state conduction

C Monochromatic radiation

D None of these

Review Detailed Answer

Correct Answer: None of these

The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?

A 165.4

B 167.5

C 172.5

D 175

Review Detailed Answer

Correct Answer: 165.4

The absorptivity of a body is equal to its emissivity _________________?

A At a particular temperature

B For circular bodies

C Under thermal equilibrium

D None of these

Review Detailed Answer

Correct Answer: Under thermal equilibrium

A perfect black body is a perfect _____________ of radiation?

A Absorber

B Emitter

C Both A. & B.

D Neither A. nor B.

Review Detailed Answer

Correct Answer: Both A. & B.

jH factor for heat transfer depends upon the ____________ number?

A Biot

B Nusselt

C Reynolds

D Prandtl

Review Detailed Answer

Correct Answer: Reynolds

The actual temperature drop across the heating surface of an evaporator depends on the_______________?

A Liquid depth over the heating surface

B Solution being evaporated

C Pressure difference between the steam chest and the vapor space above the boiling liquid

D All A., B. and C.

Review Detailed Answer

Correct Answer: All A., B. and C.

Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

A 0.2

B 0.4

C 0.6

D 0.8

Review Detailed Answer

Correct Answer: 0.6

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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All Topics 9594

A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?

It is not preferable to use superheated steam in evaporators, because of its very_________________?

_____________ heat exchanger is used for chilling oil to be dewaxed?

If heat transfer rate varies with the time, it is termed as__________________?

The absorptivity of a body is equal to its emissivity _________________?

A perfect black body is a perfect _____________ of radiation?

jH factor for heat transfer depends upon the ____________ number?

The actual temperature drop across the heating surface of an evaporator depends on the_______________?

Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?