Chemical Engineering Basics
For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

Maximum temperature is higher
Heat rejection is lower
Expansion & compression are isentropic
Combustion is at constant volume

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Chemical Engineering Basics
Maraging steels derive their strength from the following mechanism:

A fine, highly dislocated and strong martensite
Fine dispersions of Fe₃ C nucleated on dislocations in austenite
Fine dispersions of alloy carbides in a ferrite matrix
Fine dispersions of intermetallics of Fe, Ni, Ti etc

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Chemical Engineering Basics
Which of the following is not a characteristic observed in material failure by fatigue fracture ?

Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Initation of crack occurs on the surface of the machine part
Plastic deformation of material does not occur
Initiation of crack from below the surface does not occur

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