Chemical Engineering Basics MCQs

Question 1

Tungsten in high speed steel is responsible for its

Accepted Answer

Hot hardness

Answer

Toughness & wear resistance

Answer

Cold hardness

Answer

Sharp cutting edge

Question 2

In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is

Accepted Answer

Equal

Answer

More

Answer

Less

Answer

Much more

Question 3

Titanium alloys are welded using the Following process:

Accepted Answer

TIG welding

Answer

Submerged arc welding

Answer

Butt welding

Answer

Electron beam welding

Question 4

The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the

Accepted Answer

Bauschinger effect

Answer

Work hardening

Answer

Creeping effect

Answer

Stress recovery effect

Question 5

Ester is formed, when an alcohol reacts with

Accepted Answer

Carboxylic acid

Answer

Aldehyde

Answer

Ketone

Answer

Ether

Question 6

A jet engine turbine blade is normally manufactured by

Accepted Answer

Investment casting

Answer

Forging

Answer

Shell moulding

Answer

Pressure die casting

Question 7

Which of the following is the most wear resistant grade of carbide used for the cutting tools?

Accepted Answer

Tungsten carbide

Answer

Aluminium carbide

Answer

Nickel carbide

Answer

Iron carbide

Question 8

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

Accepted Answer

Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam

Answer

Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller

Answer

Maintaining vacuum on tube side is more difficult than that on the shell side

Answer

Condenser can act as a storage unit for condensed steam

Question 9

Pick out the wrong statement.

Accepted Answer

In a thin spherical shell under internal pressure, hoop stress is equal to the half of axial stress

Answer

Thermoplastic material does not follow Hooke's law of elasticity

Answer

Components under longitudinal compression is called 'struts' and the load under which strut fails is called crippling or buckling load

Answer

At low temperatures (sub-zero) in pressure vessels, the ductility of metal diminishes and brittle fracture occurs while at high temperature in pressure vessels, embrittlement of material may take place