Chemical Engineering Basics Quiz 9

1 / 50

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

Green

Yellow

Black

Silver grey

2 / 50

Pick out the wrong statement ?

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

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

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

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

3 / 50

Pick out the correct statement ?

Jet engines also carry oxidiser

Rocket engines cannot work, where there is no atmosphere

Jet engine can work, where there is no atmosphere

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

4 / 50

Photographic plates are coated with _______?

Calcium silicate

Silver nitrate

Silver halide

Metallic silver

5 / 50

Pick out the wrong statement ?

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

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

Lead can creep under its own weight at room temperature

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

6 / 50

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

Blow moulding

Extrusion

Calendaring

Injection

7 / 50

Pick out the wrong statement about nucleate boiling ?

Surface temperature is greater than the saturation temperature of the liquid

The temperature is less than that of film boiling

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

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

8 / 50

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

Arc

Thermit

Pressure

Resistance

9 / 50

Plasma is_______?

Nothing but ionised gas

A high temperature neutral gas

A source of steady and highest controllable pressure

Formed at very low temperature

10 / 50

Preheating before welding is done to______?

Burn oil & grease sticking to plate surfaces

Avoid plate distortion

Make the plate softer

Prevent cold cracks

11 / 50

Powder metallurgy process does not make metal powder by___________?

Atomisation

Electrolytic deposition

Grinding/milling

Hammering

12 / 50

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

Oxidation

Photochemical reaction

None of these

Polymerisation

13 / 50

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

All A, B. & C

Fatigue resistance

Tensile strength

Creep resistance

14 / 50

Pick out the wrong statement?

Complete unity of command exists in a line organisation

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

None of these

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

15 / 50

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

Surface tension

Adhesion

Capillary action

Cohesion

16 / 50

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

17 / 50

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

Depend on the composition, microstructure and physical & mechanical properties

Decreases with increase in strain hardening tendencies

Decreases with increases in tensile strength & decrease in grain size

Decreases with increase in hardness, in general

18 / 50

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

Elastic limit

Resilience

Machining properties

Ductility

19 / 50

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

Force of gravity

Surface tension effects of water

Upward thrust due to air

Viscous force exerted by air

20 / 50

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

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

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

Calorising is the process of coating steel with chromium

Phosphate coating is less corrosion resistant than chromate coating

21 / 50

Pick out the wrong statement?

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?

Copper is the metal having the highest electronic conductivity

22 / 50

Rankine cycle comprises of two isothermal and two _____ processes?

None of these

Isentropic

Isobaric

Polytropic

23 / 50

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

Plasticiser: increases the polymer strength

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

Heat stabiliser: increases the maximum service temperature

Lubricants: increases the flexibility of polymers

24 / 50

Primary designation of steel is based on its___________?

Alloying elements content

Iron content

Carbon content

Hardness & tensile strength

25 / 50

Powder metallurgy is used to produce___________?

High precision components with complex cavities and sharp features

Components of such alloys whose constituents do not form alloys readily

Components of large size

Porosity free components

26 / 50

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

800

1400

2000

300

27 / 50

Pick out the wrong statement?

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

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

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

Brittle materials are generally tested in tension

28 / 50

Quartz is a _________ material ?

Ferromagnetic

Piezoelectric

Ferroelectric

Diamagnetic

29 / 50

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

Drilling

High speed steel

High carbon steel

Tungsten carbide

30 / 50

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

200

1000

31 / 50

Pick out the wrong statement ?

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

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

Mild steel sheet cannot be spot welded

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

32 / 50

Pick out the wrong conversion of absolute & kinematic viscosities ?

1 N.sec/m2 = 10 paise

1 stoke = 1 m2/sec

1 m2/sec = 104 stokes

1 stoke = 1 cm2/sec

33 / 50

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

1000-1100

80-120

600-800

200-300

34 / 50

Recrystallisation temperature of steel is ________ ?C?

300

800

500

35 / 50

Pick out the wrong statement ?

Martempering of a material is a hardening process

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

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

36 / 50

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

Both A. & B.

37 / 50

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

Cobalt, chromium & nickel

Cobalt, chromium & tungsten

Molybdenum, tungsten & chromium

Cobalt, zirconium & molybdenum

38 / 50

Pick out the wrong statement ?

Inhalation of arsenic causes cancer

Geothermal energy is a non-conventional source of energy

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

Inhalation of mercury vapour is not harmful for human beings

39 / 50

Pick out the correct statement?

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

Hot worked materials are subjected to annealing to remove internal stresses

Normalising of a material induces stresses

Annealing of steel hardens it slightly

40 / 50

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

0.57

0.09

0.3

0.94

41 / 50

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

Scavenging

Deaeration

Exhaust

Condensation

42 / 50

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

None of these

Head diameter

Length

Shank diameter

43 / 50

Pick out the wrong statement?

Processing of thermosetting plastics is ideally done by injection moulding

Processing of thermoplastics is ideally done by compression moulding

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

Stretch forming is a process of cold drawing

44 / 50

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

Temperature becomes low

Pressure falls below the vapour pressure

All A, B & C

Pressure becomes very high

45 / 50

Pick out the wrong statement ?

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

Tungsten steel and alnico are not hard magnetic materials

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

46 / 50

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

Density

Strength

Plastic deformation

Machinability

47 / 50

Pick out the correct statement about the condensation?

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

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

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

48 / 50

Pick out the wrong statement ?

Most of the hydrocarbons are non-polar

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

49 / 50

Potable water means the water used for______?

Drinking

Evaporation to produce steam

Cooling

Fire-fighting

50 / 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

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

Crushing load or columns is less than the buckling load

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