Chemical Engineering Basics Quiz 9

1 / 50

Rain drops falling through atmospheric air attain limited terminal velocity, because of ______?

Upward thrust due to air

Force of gravity

Surface tension effects of water

Viscous force exerted by air

2 / 50

Pick out the wrong statement?

Stretch forming is a process of cold drawing

Mass production of seamless pipes are done by electrical resistance welding (ERW)

Processing of thermoplastics is ideally done by compression moulding

Processing of thermosetting plastics is ideally done by injection moulding

3 / 50

Pick out the wrong statement ?

Mass is converted into energy in both nuclear fission & fusion reaction

Inhalation of arsenic causes cancer

Geothermal energy is a non-conventional source of energy

Inhalation of mercury vapour is not harmful for human beings

4 / 50

Pick out the wrong statement ?

With increase in temperature, the electrical conductivity of intrinsic semi-conductor will

The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement

Lead can creep under its own weight at room temperature

Recrystallisation temperature decreases with decrease in strain in a cold worked metal

5 / 50

Pick out the wrong statement ?

Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)

Seam welding, projection welding & spot welding are the classification of electrical resistance welding

In spot welding, two pieces to be joined are overlapped and placed between two electrodes

Mild steel sheet cannot be spot welded

6 / 50

Pick out the wrong statement?

Brittle materials are generally tested in tension

Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region

Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections

Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation

7 / 50

Pick out the wrong statement?

Copper is the metal having the highest electronic conductivity

Hardenability & Weldability of metals are inversely related

Covalent bonding formed by sharing of electrons is present in all semi-conductor materials

Glass transition temperature applies to ?polymers? but not to ?glasses?

8 / 50

Potable water means the water used for______?

Fire-fighting

Drinking

Evaporation to produce steam

Cooling

9 / 50

Pick out the wrong statement?

Line organisation is net suitable for expansion and growth of an industry

None of these

Complete unity of command exists in a line organisation

In line and staff organisation, ?line? executes and ?staff directs

10 / 50

Resilience of a bolt can be increased by increasing its ___________?

Head diameter

None of these

Shank diameter

Length

11 / 50

Plants produce carbohydrates from the CO2 present in the atmosphere by__________?

Photochemical reaction

Oxidation

None of these

Polymerisation

12 / 50

Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is___________?

Black

Yellow

Silver grey

Green

13 / 50

Quartz is a _________ material ?

Diamagnetic

Ferroelectric

Ferromagnetic

Piezoelectric

14 / 50

Production of one ton of paper in Indian paper industry consumes about _____ kWh of electricity ?

2000

800

300

1400

15 / 50

Projection welding & stud welding is categorised as the ________ welding?

Arc

Resistance

Pressure

Thermit

16 / 50

Plastics as a material of construction suffer from the drawback of low__________?

Density

Machinability

Plastic deformation

Strength

17 / 50

Pick out the wrong statement ?

Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburising, choiceno C nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness

Martempering of a material is a hardening process

Induction hardening and flame hardening techniques are also used for surface hardening

Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties

18 / 50

Pick out the wrong statement ?

None of these

Molecules with symmetrical arrangements (e.g. CH4 or CCl4) are non-polar

Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise

Most of the hydrocarbons are non-polar

19 / 50

Pick out the wrong conversion of absolute & kinematic viscosities ?

1 m2/sec = 104 stokes

1 N.sec/m2 = 10 paise

1 stoke = 1 m2/sec

1 stoke = 1 cm2/sec

20 / 50

Pick out the correct statement ?

Jet engine can work, where there is no atmosphere

Rocket engines cannot work, where there is no atmosphere

Jet engines also carry oxidiser

Rocket engines carry oxygen required for the combustion in the form of oxidiser

21 / 50

Recrystallisation temperature of steel is ________ ?C?

800

300

500

22 / 50

Removal of non-condensable from steam or other vapour is termed as the _________ process?

Scavenging

Exhaust

Condensation

Deaeration

23 / 50

Pick out the wrong statement ?

The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays

The X-rays cannot be deflected by electric field unlike cathode rays

The quality of X-rays can be controlled by varying the anode-cathode voltage

Crystal structure of a material can be studied by an electron microscope

24 / 50

Photographic plates are coated with _______?

Calcium silicate

Silver nitrate

Silver halide

Metallic silver

25 / 50

Percentage of differential pressure lost in a Venturimeter with a tapering of 15? may be about_____?

26 / 50

Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?

Cobalt, chromium & tungsten

Molybdenum, tungsten & chromium

Cobalt, chromium & nickel

Cobalt, zirconium & molybdenum

27 / 50

Powder metallurgy is used to produce___________?

Porosity free components

High precision components with complex cavities and sharp features

Components of large size

Components of such alloys whose constituents do not form alloys readily

28 / 50

Powder metallurgy process does not make metal powder by___________?

Electrolytic deposition

Grinding/milling

Atomisation

Hammering

29 / 50

Regeneration of molecular sieve requires it to be heated to a temperature of about ___________ ?C?

600-800

1000-1100

80-120

200-300

30 / 50

Pick out the wrong statement about coating/electroplating of metals ?

Phosphate coating is less corrosion resistant than chromate coating

The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode

Phosphate coating is used as an excellent base for paints & enamels

Calorising is the process of coating steel with chromium

31 / 50

Powder metallurgy technique is used in the production of ______ tools ?

Tungsten carbide

Drilling

High carbon steel

High speed steel

32 / 50

Pick out the correct statement about the condensation?

Reynolds number of condensing liquid is based on its mass flow rate

Filmwise condensation gives a lower heat transfer rate than the dropwise condensation

If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it

Suitable coating or vapour additive is used to promote film wise condensation

33 / 50

Plasma is_______?

A high temperature neutral gas

Nothing but ionised gas

A source of steady and highest controllable pressure

Formed at very low temperature

34 / 50

Reduction in the grain size reduces the __________ of the material?

Tensile strength

Fatigue resistance

Creep resistance

All A, B. & C

35 / 50

Pick out the wrong statement ?

The equivalent stiffness of two springs (of equal stiffness ?S?) in series is S/2 while in parallel is 2S

Modulus of resilience is proportional to (stress at elastic limit)2

Crushing load or columns is less than the buckling load

For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire diameter)

36 / 50

Primary designation of steel is based on its___________?

Carbon content

Hardness & tensile strength

Iron content

Alloying elements content

37 / 50

Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)_________?

Both A. & B.

38 / 50

Presence of nickel & chromium in steel does not raise its __________?

Resilience

Elastic limit

Machining properties

Ductility

39 / 50

Probability of cavitation occuring becomes very high, when the local ________ resulting ?

All A, B & C

Pressure becomes very high

Temperature becomes low

Pressure falls below the vapour pressure

40 / 50

Pick out the correct combination about the role of various additives used in polymers ?

Heat stabiliser: increases the maximum service temperature

Fillers: Does not affect the property of polymer but increases its weight

Plasticiser: increases the polymer strength

Lubricants: increases the flexibility of polymers

41 / 50

Pick out the wrong statement about the machinability of metals. Machinability of a metal ?

Decreases with increase in hardness, in general

Decreases with increases in tensile strength & decrease in grain size

Depend on the composition, microstructure and physical & mechanical properties

Decreases with increase in strain hardening tendencies

42 / 50

Production of a hollow product by inflation of a tube or parison is called the ________ process?

Blow moulding

Calendaring

Extrusion

Injection

43 / 50

Pick out the wrong statement ?

Tungsten steel and alnico are not hard magnetic materials

Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials

A ferromagnetic material becomes paramagnetic above the ?Curie temperature?

Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces

44 / 50

Percentage of argon (by volume) in dry atmospheric air is about_________?

0.57

0.3

0.09

0.94

45 / 50

Preheating before welding is done to______?

Make the plate softer

Prevent cold cracks

Burn oil & grease sticking to plate surfaces

Avoid plate distortion

46 / 50

Pick out the correct statement?

Annealing of steel hardens it slightly

Tempering of a material improves ductility & toughness but reduces hardness & brittleness

Normalising of a material induces stresses

Hot worked materials are subjected to annealing to remove internal stresses

47 / 50

Pick out the wrong statement about nucleate boiling ?

The temperature is less than that of film boiling

Heat transfer from the surface of the liquid is less than that in film boiling

Surface temperature is greater than the saturation temperature of the liquid

Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface

48 / 50

Rankine cycle comprises of two isothermal and two _____ processes?

Isobaric

None of these

Isentropic

Polytropic

49 / 50

Property responsible for the talcum powder to cling to the skin is the___________?

Adhesion

Cohesion

Capillary action

Surface tension

50 / 50

Pressure required to increase the density of water by about 1% is ______ atmosphere?

1000

200

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