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___________?

Silver grey

Green

Yellow

Black

2 / 50

Powder metallurgy process does not make metal powder by___________?

Atomisation

Electrolytic deposition

Grinding/milling

Hammering

3 / 50

Powder metallurgy is used to produce___________?

Components of large size

High precision components with complex cavities and sharp features

Components of such alloys whose constituents do not form alloys readily

Porosity free components

4 / 50

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

Creep resistance

Fatigue resistance

All A, B. & C

Tensile strength

5 / 50

Pick out the correct statement ?

Jet engine can work, where there is no atmosphere

Rocket engines cannot work, where there is no atmosphere

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

Jet engines also carry oxidiser

6 / 50

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

0.09

0.3

0.94

0.57

7 / 50

Pick out the wrong statement ?

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

A ferromagnetic material becomes paramagnetic above the ?Curie temperature?

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

Tungsten steel and alnico are not hard magnetic materials

8 / 50

Plasma is_______?

Nothing but ionised gas

A source of steady and highest controllable pressure

A high temperature neutral gas

Formed at very low temperature

9 / 50

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

High speed steel

Tungsten carbide

Drilling

High carbon steel

10 / 50

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

Condensation

Deaeration

Exhaust

Scavenging

11 / 50

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

Molybdenum, tungsten & chromium

Cobalt, zirconium & molybdenum

Cobalt, chromium & tungsten

Cobalt, chromium & nickel

12 / 50

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

Length

None of these

Head diameter

Shank diameter

13 / 50

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

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

Calorising is the process of coating steel with chromium

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

14 / 50

Recrystallisation temperature of steel is ________ ?C?

800

500

300

15 / 50

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

Blow moulding

Extrusion

Calendaring

Injection

16 / 50

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

Lubricants: increases the flexibility of 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

17 / 50

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

Ductility

Elastic limit

Machining properties

Resilience

18 / 50

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

80-120

200-300

600-800

1000-1100

19 / 50

Quartz is a _________ material ?

Piezoelectric

Ferroelectric

Diamagnetic

Ferromagnetic

20 / 50

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

Surface tension

Capillary action

Adhesion

Cohesion

21 / 50

Photographic plates are coated with _______?

Calcium silicate

Silver halide

Silver nitrate

Metallic silver

22 / 50

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

1000

200

23 / 50

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

Polymerisation

None of these

Photochemical reaction

Oxidation

24 / 50

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

Strength

Density

Plastic deformation

Machinability

25 / 50

Pick out the correct statement?

Annealing of steel hardens it slightly

Normalising of a material induces stresses

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

Hot worked materials are subjected to annealing to remove internal stresses

26 / 50

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

Decreases with increase in strain hardening tendencies

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

27 / 50

Potable water means the water used for______?

Evaporation to produce steam

Drinking

Cooling

Fire-fighting

28 / 50

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

29 / 50

Primary designation of steel is based on its___________?

Alloying elements content

Carbon content

Iron content

Hardness & tensile strength

30 / 50

Pick out the wrong statement ?

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

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

Lead can creep under its own weight at room temperature

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

31 / 50

Pick out the wrong statement ?

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

Geothermal energy is a non-conventional source of energy

Inhalation of mercury vapour is not harmful for human beings

Inhalation of arsenic causes cancer

32 / 50

Pick out the correct statement about the condensation?

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

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

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

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

33 / 50

Pick out the wrong statement?

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

Complete unity of command exists in a line organisation

None of these

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

34 / 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

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

Martempering of a material is a hardening process

35 / 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)

36 / 50

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

Force of gravity

Upward thrust due to air

Surface tension effects of water

Viscous force exerted by air

37 / 50

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

2000

1400

300

800

38 / 50

Pick out the wrong conversion of absolute & kinematic viscosities ?

1 stoke = 1 cm2/sec

1 m2/sec = 104 stokes

1 stoke = 1 m2/sec

1 N.sec/m2 = 10 paise

39 / 50

Pick out the wrong statement ?

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

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

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

40 / 50

Preheating before welding is done to______?

Avoid plate distortion

Burn oil & grease sticking to plate surfaces

Prevent cold cracks

Make the plate softer

41 / 50

Pick out the wrong statement?

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

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

42 / 50

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

Pressure

Arc

Resistance

Thermit

43 / 50

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

Both A. & B.

44 / 50

Pick out the wrong statement ?

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)

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

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

45 / 50

Pick out the wrong statement about nucleate boiling ?

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

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

46 / 50

Pick out the wrong statement ?

None of these

Most of the hydrocarbons are non-polar

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

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

47 / 50

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

Pressure becomes very high

All A, B & C

Pressure falls below the vapour pressure

Temperature becomes low

48 / 50

Rankine cycle comprises of two isothermal and two _____ processes?

None of these

Polytropic

Isobaric

Isentropic

49 / 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

50 / 50

Pick out the wrong statement?

Processing of thermosetting plastics is ideally done by injection moulding

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

Stretch forming is a process of cold drawing

Processing of thermoplastics is ideally done by compression moulding

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