ChE Basics

Question 1

Which one of the following is incombustible ?
H2, CCl4, C2H2, S

Answer 1

CCl4

Question 2

The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.

Answer 2

Aluminum Oxide

Question 3

Tin based white metals are used, where bearings are subjected to

Answer 3

high pressure & load

Question 4

Friction factor for fluid flow in pipe does not depend upon which of the following?
Pipe Length, Pipe Roughness, Fluid Density & Viscosity, Mass Flow Rate of Fluid

Answer 4

Pipe Length

Question 5

All of the following alloying elements of steel increases hardness but sacrifice ductility, except which of the ff.
Nickel, Vanadium, Molybdenum, Chromium

Answer 5

Nickel

Question 6

The following type of bonding is strongly directional in solids.

Answer 6

Covalant

Question 7

Fog is an example of colloidal system of ________ dispersed in _____.

Answer 7

liquid dispersed in gas

Question 8

Chromium molybdenum steel can not be welded using __________ welding.

Answer 8

electrical resistance

Question 9

Speisses is a mixture of _______ of heavy metals.

Answer 9

Arsenides

Question 10

Auto collimator is used to check

Answer 10

Angles

Question 11

In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

Answer 11

t = 15 - 0.0065 h

Question 12

A high pressure boiler generates steam at a pressure greater than __________ kg/cm2

Answer 12

80

Question 13

Evaporative cooling process employs a combination of cooling and humidification in which the

Answer 13

sensible heat is removed and the latent heat is added

Question 14

Which of the following is not an explosive ?
TNT, CMC, RDX, Lead azide

Answer 14

CMC

Question 15

Maxwell’s thermodynamic relations applies to the

Answer 15

chemical systems in equilibrium

Question 16

Annealing of white cast iron produces __________ iron.

Answer 16

malleable

Question 17

Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)

Answer 17

A = cross-sectional area of the conductor and l = length

Question 18

A solar cell converts the sunlight directly into __________ energy.

Answer 18

electrical

Question 19

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

Answer 19

breeder

Question 20

Wrought iron is never shaped by

Answer 20

casting

Question 21

Powder metallurgy process does not make metal powder by

Answer 21

hammering

Question 22

In the blast furnace, incorporation of water vapour in the blast gives the following effect.

Answer 22

Increases the reducing potential of the gas

Question 23

True or False.
Tungsten steel and alnico are not hard magnetic materials.

Answer 23

False

Question 24

The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.

Answer 24

400-700

Question 25

Maximum permissible air velocity in pipelines is about __________ metre/second.

Answer 25

10

Question 26

Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience/elasticity.

Answer 26

proportional limit

Question 27

__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

Answer 27

Alumina

Question 28

Titanium alloys are welded using what process.

Answer 28

TIG welding

Question 29

An alloy of Fe - 0.4 % C is

Answer 29

hypo-eutectoid steel

Question 30

A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’; an example of which is

Answer 30

mica