Chemical Engineering Basics MCQs

Question 1

Which of the following accounts for maximum loss of energy in a coal fired boiler?

Accepted Answer

Outgoing flue gases

Answer

Incomplete combustion of fuel

Answer

Radiation heat losses

Answer

Unburnt carbon in ash

Question 2

An ideal material for making cooking vessels should have

Accepted Answer

Both B and C

Answer

High heat capacity

Answer

Low heat capacity

Answer

High thermal conductivity

Question 3

Leakage in a cooking gas cylinder is detected by

Accepted Answer

Pungent smell of mercaptans present in the gas

Answer

Radio-isotopes

Answer

Pouring soap solution on the surface and locating the gas bubbles

Answer

Halide torch

Question 4

Secondary hardening in steels arises out of the

Accepted Answer

Decomposition of retained austenite upon heat treatment

Answer

Precipitation of fine alloy carbides at high temperatures

Answer

Refinement of ferrite grain size by working

Answer

Precipitation of complex inter-metal-lics upon heat treatment

Question 5

Which of the following is not a natural abrasive?

Accepted Answer

Silicon carbide

Answer

Quartz

Answer

Corundum

Answer

Emery

Question 6

__________ has the highest melting point out of the following.

Accepted Answer

Tungsten

Answer

Zirconium

Answer

Molybdenum

Answer

Tantalum

Question 7

The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

Accepted Answer

Flow output

Answer

Head developed

Answer

Overall efficiency

Answer

Weight

Question 8

In hot working, dynamic recovery occurs in

Accepted Answer

Metals of high stacking fault energy e.g. α-iron

Answer

Metals of low stacking fault energy

Answer

Single crystal of Ni-based superalloys

Answer

None of these

Question 9

In sheet metal forming, stretcher strains occur in

Accepted Answer

Duralumin sheets

Answer

Low carbon steel sheets

Answer

Austenitic stainless steel sheets

Answer

Ni-base alloy sheets