Chemical Engineering Basics Quiz 9

1 / 50

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

Elastic limit

Machining properties

Resilience

Ductility

2 / 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

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 less corrosion resistant than chromate coating

3 / 50

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

Resistance

Pressure

Thermit

Arc

4 / 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

Heat stabiliser: increases the maximum service temperature

Lubricants: increases the flexibility of polymers

Plasticiser: increases the polymer strength

5 / 50

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

800

1400

300

2000

6 / 50

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

0.57

0.94

0.09

0.3

7 / 50

Primary designation of steel is based on its___________?

Hardness & tensile strength

Iron content

Alloying elements content

Carbon content

8 / 50

Pick out the wrong statement ?

None of these

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

Most of the hydrocarbons are non-polar

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

9 / 50

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

Condensation

Deaeration

Exhaust

Scavenging

10 / 50

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

Decreases with increase in strain hardening tendencies

Depend on the composition, microstructure and physical & mechanical properties

Decreases with increases in tensile strength & decrease in grain size

Decreases with increase in hardness, in general

11 / 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

12 / 50

Potable water means the water used for______?

Evaporation to produce steam

Drinking

Cooling

Fire-fighting

13 / 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

14 / 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

Mild steel sheet cannot be spot welded

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

15 / 50

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

16 / 50

Pick out the wrong statement ?

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

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

17 / 50

Rankine cycle comprises of two isothermal and two _____ processes?

None of these

Isobaric

Polytropic

Isentropic

18 / 50

Preheating before welding is done to______?

Prevent cold cracks

Burn oil & grease sticking to plate surfaces

Make the plate softer

Avoid plate distortion

19 / 50

Pick out the wrong statement?

Processing of thermoplastics is ideally done by compression moulding

Processing of thermosetting plastics is ideally done by injection moulding

Stretch forming is a process of cold drawing

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

20 / 50

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

Cobalt, chromium & nickel

Molybdenum, tungsten & chromium

Cobalt, chromium & tungsten

Cobalt, zirconium & molybdenum

21 / 50

Recrystallisation temperature of steel is ________ ?C?

800

300

500

22 / 50

Quartz is a _________ material ?

Ferromagnetic

Piezoelectric

Diamagnetic

Ferroelectric

23 / 50

Powder metallurgy process does not make metal powder by___________?

Grinding/milling

Atomisation

Hammering

Electrolytic deposition

24 / 50

Plasma is_______?

A high temperature neutral gas

Formed at very low temperature

Nothing but ionised gas

A source of steady and highest controllable pressure

25 / 50

Pick out the wrong statement ?

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

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

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

26 / 50

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

80-120

1000-1100

200-300

600-800

27 / 50

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

Extrusion

Calendaring

Blow moulding

Injection

28 / 50

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

Viscous force exerted by air

Force of gravity

Upward thrust due to air

Surface tension effects of water

29 / 50

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

Plastic deformation

Density

Machinability

Strength

30 / 50

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

High carbon steel

Tungsten carbide

Drilling

High speed steel

31 / 50

Pick out the wrong conversion of absolute & kinematic viscosities ?

1 stoke = 1 cm2/sec

1 N.sec/m2 = 10 paise

1 stoke = 1 m2/sec

1 m2/sec = 104 stokes

32 / 50

Pick out the wrong statement ?

Inhalation of mercury vapour is not harmful for human beings

Inhalation of arsenic causes cancer

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

Geothermal energy is a non-conventional source of energy

33 / 50

Pick out the wrong statement?

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

Brittle materials are generally tested in tension

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

34 / 50

Pick out the wrong statement?

Complete unity of command exists in a line organisation

None of these

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

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

35 / 50

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

Pressure falls below the vapour pressure

Pressure becomes very high

All A, B & C

Temperature becomes low

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

Pick out the wrong statement about nucleate 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

The temperature is less than that of film boiling

38 / 50

Pick out the wrong statement?

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

Hardenability & Weldability of metals are inversely related

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

Copper is the metal having the highest electronic conductivity

39 / 50

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

None of these

Polymerisation

Oxidation

Photochemical reaction

40 / 50

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

Head diameter

Length

None of these

Shank diameter

41 / 50

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

Yellow

Green

Silver grey

Black

42 / 50

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

Tensile strength

Creep resistance

Fatigue resistance

All A, B. & C

43 / 50

Photographic plates are coated with _______?

Metallic silver

Calcium silicate

Silver nitrate

Silver halide

44 / 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

45 / 50

Pick out the wrong statement ?

Lead can creep under its own weight at room temperature

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

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

46 / 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

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?

47 / 50

Pick out the wrong statement ?

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

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

48 / 50

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

200

1000

49 / 50

Pick out the correct statement about the condensation?

Suitable coating or vapour additive is used to promote film wise 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

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

50 / 50

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

Cohesion

Surface tension

Capillary action

Adhesion

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 0%