Chemical Engineering Basics Quiz 9

1 / 50

Pick out the correct statement?

Normalising of a material induces stresses

Hot worked materials are subjected to annealing to remove internal stresses

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

Annealing of steel hardens it slightly

2 / 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 engine can work, where there is no atmosphere

Jet engines also carry oxidiser

3 / 50

Pick out the correct statement about the 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

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

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

4 / 50

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

Plasticiser: increases the polymer strength

Heat stabiliser: increases the maximum service temperature

Lubricants: increases the flexibility of polymers

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

5 / 50

Pick out the wrong statement ?

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

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

6 / 50

Pick out the wrong statement ?

Inhalation of arsenic causes cancer

Inhalation of mercury vapour is not harmful for human beings

Geothermal energy is a non-conventional source of energy

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

7 / 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

8 / 50

Photographic plates are coated with _______?

Silver halide

Calcium silicate

Silver nitrate

Metallic silver

9 / 50

Pick out the wrong statement ?

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

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

10 / 50

Pick out the wrong statement ?

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

None of these

11 / 50

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

80-120

1000-1100

600-800

200-300

12 / 50

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

Both A. & B.

13 / 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

14 / 50

Pick out the wrong statement ?

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

Crushing load or columns is less than the buckling load

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

15 / 50

Plasma is_______?

A high temperature neutral gas

A source of steady and highest controllable pressure

Nothing but ionised gas

Formed at very low temperature

16 / 50

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

None of these

Oxidation

Polymerisation

Photochemical reaction

17 / 50

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

Surface tension effects of water

Viscous force exerted by air

Force of gravity

Upward thrust due to air

18 / 50

Pick out the wrong statement about nucleate boiling ?

Surface temperature is greater than the saturation temperature of the liquid

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

The temperature is less than that of film boiling

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

19 / 50

Primary designation of steel is based on its___________?

Hardness & tensile strength

Iron content

Carbon content

Alloying elements content

20 / 50

Powder metallurgy process does not make metal powder by___________?

Electrolytic deposition

Hammering

Atomisation

Grinding/milling

21 / 50

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

Cobalt, chromium & nickel

Cobalt, chromium & tungsten

Cobalt, zirconium & molybdenum

Molybdenum, tungsten & chromium

22 / 50

Recrystallisation temperature of steel is ________ ?C?

500

300

800

23 / 50

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

None of these

Shank diameter

Length

Head diameter

24 / 50

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

800

300

2000

1400

25 / 50

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

26 / 50

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

Surface tension

Adhesion

Capillary action

Cohesion

27 / 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

28 / 50

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

0.94

0.57

0.3

0.09

29 / 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

30 / 50

Pick out the wrong statement?

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)

Processing of thermoplastics is ideally done by compression moulding

31 / 50

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

Calendaring

Extrusion

Injection

Blow moulding

32 / 50

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

Pressure

Thermit

Arc

Resistance

33 / 50

Pick out the wrong conversion of absolute & kinematic viscosities ?

1 N.sec/m2 = 10 paise

1 stoke = 1 m2/sec

1 stoke = 1 cm2/sec

1 m2/sec = 104 stokes

34 / 50

Pick out the wrong statement ?

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)

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

35 / 50

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

1000

200

36 / 50

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

Exhaust

Deaeration

Condensation

Scavenging

37 / 50

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

All A, B. & C

Creep resistance

Fatigue resistance

Tensile strength

38 / 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

39 / 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

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

40 / 50

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

Machining properties

Ductility

Elastic limit

Resilience

41 / 50

Rankine cycle comprises of two isothermal and two _____ processes?

Polytropic

None of these

Isentropic

Isobaric

42 / 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

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

43 / 50

Pick out the wrong statement?

Copper is the metal having the highest electronic conductivity

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

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

Hardenability & Weldability of metals are inversely related

44 / 50

Quartz is a _________ material ?

Ferromagnetic

Piezoelectric

Diamagnetic

Ferroelectric

45 / 50

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

Pressure becomes very high

Temperature becomes low

Pressure falls below the vapour pressure

All A, B & C

46 / 50

Potable water means the water used for______?

Drinking

Cooling

Fire-fighting

Evaporation to produce steam

47 / 50

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

Strength

Machinability

Density

Plastic deformation

48 / 50

Pick out the wrong statement ?

Lead can creep under its own weight at room temperature

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

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

49 / 50

Preheating before welding is done to______?

Make the plate softer

Burn oil & grease sticking to plate surfaces

Avoid plate distortion

Prevent cold cracks

50 / 50

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

Drilling

Tungsten carbide

High speed steel

High carbon steel

Provide Your Information

NameEmailPhone Number

Your score is

The average score is 0%