Chemical Engineering Basics MCQ Questions & Answers

31

Pick out the wrong statement.

A) For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1 B) For calculating forces and efficiency of rivetted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work C) Longitudinal joint is normally made butt joint to maintain the circularity of the vessel D) Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm

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Answer & Solution

Answer: Option B

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32

Diamagnetic materials

A) Are magnetised by eddy currents only B) Are non-magnetic and can not be magnetised C) Are magnetised in direction opposite to the magnetic field D) Can be magnetised in one direction only

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Answer & Solution

Answer: Option C

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33

Reynolds number of a fluid flowing in a circular pipe is 10000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

A) 9100 B) 13000 C) 7000 D) 2550

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Answer & Solution

Answer: Option A

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34

Which of the following is an acidic constituent of B.F. slag?

A) SiO₂ B) FeO C) MgO D) CaO

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Answer & Solution

Answer: Option A

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35

Dielectric . . . . . . . .

A) Is an electrical insulating material B) Of low resistivity is preferred C) Should have high thermal conductivity D) Need not defy the corrosive action of chemicals

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Answer & Solution

Answer: Option A

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36

Largest application of laser welding is in __________ welding.

A) Microspot B) Under water C) Precious metals D) Heavy structure

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Answer & Solution

Answer: Option A

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37

Nitriding of steel is a process for

A) Case hardening B) Spheroidising C) Normalising D) Annealing

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Answer & Solution

Answer: Option A

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38

A dense structure of grinding wheel is not used for the

A) Ductile material B) Hard materials C) Brittle materials D) Finishing cuts

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Answer & Solution

Answer: Option A

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39

The hardness of a grinding wheel is specified by the

A) Alphabetical letter B) Rockwell hardness number C) Brinell hardness number D) None of these

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Answer & Solution

Answer: Option A

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40

Addition of silicon to cast iron

A) Promotes graphite module formation B) Improves its ductility C) Does not promote graphite flakes formation D) Increases the fluidity of molten metal

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Answer & Solution

Answer: Option D

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Chemical Engineering Basics MCQ Questions & Answers | Chemical Engineering