Chemical Engineering Basics - Chemical Engineering Questions and Answers

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A coal with high __________ content will ignite most easily.

hydrogen

oxygen

volatile matter

fixed carbon

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The weight of a body at the centre of the earth is

infinite.

zero.

same as on the surface of the earth.

none of these.

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

heat rejection is lower.

expansion & compression are isentropic.

maximum temperature is higher.

combustion is at constant volume.

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The single most imortant requirement for a turbine blade material is

damping

resilience

creep resistaned

DBTT

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In cold working of metal as compared to its hot working

cracks and blow holes are eliminated.

ductility and impact strength improves.

appreciable strain hardening is produced.

yield stress, hardness and fatigue strength is not at all affected.

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__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

Lancing

Shot peening

Slugging

Spinning

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Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

scratch

indentation

dynamic

rebound

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Which of the following is a weak acid ?

HCl

HBr

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Pig iron is a product of

electric arc furnace

cupola

blast furnace

open hearth furnace