Chemical Engineering Basics Quiz 9

1 / 50

Preheating before welding is done to______?

Prevent cold cracks

Avoid plate distortion

Make the plate softer

Burn oil & grease sticking to plate surfaces

2 / 50

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

Length

Head diameter

Shank diameter

None of these

3 / 50

Pick out the correct statement ?

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

Jet engine can work, where there is no atmosphere

4 / 50

Pick out the wrong statement?

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

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

Complete unity of command exists in a line organisation

None of these

5 / 50

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

Tensile strength

Creep resistance

Fatigue resistance

All A, B. & C

6 / 50

Recrystallisation temperature of steel is ________ ?C?

300

800

500

7 / 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

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

8 / 50

Plasma is_______?

Nothing but ionised gas

Formed at very low temperature

A source of steady and highest controllable pressure

A high temperature neutral gas

9 / 50

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

600-800

1000-1100

80-120

200-300

10 / 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?

Tungsten steel and alnico are not hard magnetic materials

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

11 / 50

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

Tungsten carbide

High carbon steel

Drilling

High speed steel

12 / 50

Pick out the wrong statement ?

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

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

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

13 / 50

Pick out the wrong statement?

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

Hardenability & Weldability of metals are inversely related

Copper is the metal having the highest electronic conductivity

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

14 / 50

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

Deaeration

Exhaust

Scavenging

Condensation

15 / 50

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

Extrusion

Injection

Blow moulding

Calendaring

16 / 50

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

Force of gravity

Surface tension effects of water

Viscous force exerted by air

Upward thrust due to air

17 / 50

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

Capillary action

Surface tension

Cohesion

Adhesion

18 / 50

Primary designation of steel is based on its___________?

Hardness & tensile strength

Alloying elements content

Iron content

Carbon content

19 / 50

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

1400

300

2000

800

20 / 50

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

Pressure becomes very high

Temperature becomes low

All A, B & C

Pressure falls below the vapour pressure

21 / 50

Quartz is a _________ material ?

Piezoelectric

Ferroelectric

Diamagnetic

Ferromagnetic

22 / 50

Potable water means the water used for______?

Drinking

Cooling

Evaporation to produce steam

Fire-fighting

23 / 50

Pick out the wrong statement ?

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)

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

24 / 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)

Processing of thermoplastics is ideally done by compression moulding

Stretch forming is a process of cold drawing

25 / 50

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

26 / 50

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

Resilience

Machining properties

Elastic limit

Ductility

27 / 50

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

200

1000

28 / 50

Pick out the wrong statement ?

Inhalation of mercury vapour is not harmful for human beings

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

29 / 50

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

Thermit

Pressure

Resistance

Arc

30 / 50

Pick out the correct statement?

Annealing of steel hardens it slightly

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

31 / 50

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

Calorising is the process of coating steel with chromium

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

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

32 / 50

Pick out the wrong statement?

Brittle materials are generally tested in tension

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

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

33 / 50

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

Both A. & B.

34 / 50

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

Green

Black

Silver grey

Yellow

35 / 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

36 / 50

Pick out the wrong statement ?

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)

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

Crushing load or columns is less than the buckling load

37 / 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

38 / 50

Pick out the wrong conversion of absolute & kinematic viscosities ?

1 stoke = 1 m2/sec

1 N.sec/m2 = 10 paise

1 m2/sec = 104 stokes

1 stoke = 1 cm2/sec

39 / 50

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

Plastic deformation

Density

Machinability

Strength

40 / 50

Pick out the wrong statement ?

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

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

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

41 / 50

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

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

Plasticiser: increases the polymer strength

Heat stabiliser: increases the maximum service temperature

Lubricants: increases the flexibility of polymers

42 / 50

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

None of these

Oxidation

Photochemical reaction

Polymerisation

43 / 50

Powder metallurgy process does not make metal powder by___________?

Hammering

Grinding/milling

Electrolytic deposition

Atomisation

44 / 50

Pick out the wrong statement ?

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

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

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

45 / 50

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

Decreases with increases in tensile strength & decrease in grain size

Decreases with increase in hardness, in general

Decreases with increase in strain hardening tendencies

Depend on the composition, microstructure and physical & mechanical properties

46 / 50

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

0.94

0.3

0.57

0.09

47 / 50

Photographic plates are coated with _______?

Silver nitrate

Silver halide

Metallic silver

Calcium silicate

48 / 50

Rankine cycle comprises of two isothermal and two _____ processes?

None of these

Isentropic

Polytropic

Isobaric

49 / 50

Powder metallurgy is used to produce___________?

Components of large size

Porosity free components

High precision components with complex cavities and sharp features

Components of such alloys whose constituents do not form alloys readily

50 / 50

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

Molybdenum, tungsten & chromium

Cobalt, chromium & nickel

Cobalt, chromium & tungsten

Cobalt, zirconium & molybdenum

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