Chemical Engineering Basics MCQs

Chemical Engineering Objective Questions

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827. A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m². The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m² °C.

828. The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.

829. 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

830. Out of the following, the most melleable material is

C. Wrought iron

831. Fluorine is not a constituent of

D. Fluorocarbons

832. Which of the following is not a characteristic observed in material failure by fatigue fracture ?

A. Plastic deformation of material does not occur

B. Initiation of crack from below the surface does not occur

C. Initation of crack occurs on the surface of the machine part

D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

833. Multistage compression is necessary for high efficiency,

A. If the ratio of the delivery pressure to the intake pressure exceeds 5:1

B. When large amount of gas is to be compressed

C. When the delivered gas is desired at very high velocity

D. None of these

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