MCQOPTIONS
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MCQOPTIONS
This section includes 2253 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1001. |
In the diving apparatus, helium is used along with oxygen, because it is |
| A. | easily available. |
| B. | not soluble in blood at high pressure. |
| C. | lighter than nitrogen. |
| D. | completely miscible with oxygen. |
| Answer» C. lighter than nitrogen. | |
| 1002. |
Solute atoms which cause yield point phenomenon in mild steel are/is |
| A. | aluminium |
| B. | boron |
| C. | carbon |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 1003. |
An oxidation process is accompanied with decrease in the |
| A. | number of electrons. |
| B. | oxidation number. |
| C. | number of ions. |
| D. | all (a), (b) & (c). |
| Answer» B. oxidation number. | |
| 1004. |
At the point of boundary layer separation in fluid flow, the |
| A. | shear stress is maximum. |
| B. | velocity gradient is flat. |
| C. | density variation is maximum. |
| D. | shear stress is zero. |
| Answer» B. velocity gradient is flat. | |
| 1005. |
The single most imortant requirement for a turbine blade material is |
| A. | damping |
| B. | resilience |
| C. | creep resistaned |
| D. | DBTT |
| Answer» D. DBTT | |
| 1006. |
A floating body oscillates about its __________ when it is displaced slightly. |
| A. | centre of gravity |
| B. | metacentre |
| C. | centre of buoyancy |
| D. | centre of pressure |
| Answer» C. centre of buoyancy | |
| 1007. |
Cold working of a material results in increase in hardness, which is termed as the __________ hardening. |
| A. | cold |
| B. | work |
| C. | age |
| D. | induction |
| Answer» C. age | |
| 1008. |
While the bin cards are used in the effective stores management, the queing theory is associated with the __________ time. |
| A. | waiting |
| B. | idle |
| C. | inspection |
| D. | tool replacement |
| Answer» B. idle | |
| 1009. |
For a fixed cross-sectional area, the most economical channel section has maximum |
| A. | wetted perimeter. |
| B. | fluid discharge rate. |
| C. | fluid velocity. |
| D. | depth of flowing fluid. |
| Answer» C. fluid velocity. | |
| 1010. |
Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same |
| A. | period increases. |
| B. | period decreases. |
| C. | group increases. |
| D. | both 'b' & 'c'. |
| Answer» E. | |
| 1011. |
"Encyclopaedia of Chemical Technology" has been |
| A. | authored by Kirk Othmer. |
| B. | edited by Perry and Chilton. |
| C. | edited by Kirk Othmer. |
| D. | authored by Perry and Chilton. |
| Answer» D. authored by Perry and Chilton. | |
| 1012. |
A spring material should have low |
| A. | elastic limit |
| B. | deflection value |
| C. | fatigue resistance |
| D. | none of these |
| Answer» E. | |
| 1013. |
In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will |
| A. | decrease gradually. |
| B. | increase gradually. |
| C. | increase rapidly. |
| D. | remain constant. |
| Answer» C. increase rapidly. | |
| 1014. |
Limestone addition in the blast furnace is done to flux __________ present in the raw materials. |
| A. | SiO2 |
| B. | Al2O3 |
| C. | MnO2 |
| D. | P |
| Answer» B. Al2O3 | |
| 1015. |
Air standard Otto cycle is more efficient than the diesel cycle for the same |
| A. | heat addition & compression ratio. |
| B. | heat addition & pressure. |
| C. | compression ratio & pressure. |
| D. | cylinder dimension & rpm. |
| Answer» B. heat addition & pressure. | |
| 1016. |
Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means |
| A. | disposing off a machine/property on as is where is basis. |
| B. | disposing off machine/property, which is no longer useful in the present scenerio. |
| C. | mortgaging the obsolete machine/property. |
| D. | writing off the obsolete machine/ property. |
| Answer» C. mortgaging the obsolete machine/property. | |
| 1017. |
Lead is poured into the joints between two __________ pipes. |
| A. | cast iron |
| B. | steel |
| C. | concrete |
| D. | plastic |
| Answer» B. steel | |
| 1018. |
X-rays are |
| A. | positively charged. |
| B. | negatively charged. |
| C. | neutral. |
| D. | of higher wavelength than visible light. |
| Answer» D. of higher wavelength than visible light. | |
| 1019. |
Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses. |
| A. | forging |
| B. | cold rolling |
| C. | hot rolling |
| D. | casting |
| Answer» C. hot rolling | |
| 1020. |
An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is |
| A. | 0 |
| B. | 60 |
| C. | 30 |
| D. | 20 |
| Answer» B. 60 | |
| 1021. |
__________ of hard alloy and tool steel is done to make it easily machinable. |
| A. | Case carburising |
| B. | Tempering |
| C. | Normalising |
| D. | Annealing |
| Answer» C. Normalising | |
| 1022. |
Styrofoam is the commercial name of |
| A. | polyurathene |
| B. | polystyrene |
| C. | polyacrylonitrile |
| D. | polybutadiene |
| Answer» C. polyacrylonitrile | |
| 1023. |
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10-16 m2 . S-1 and it is 1.94 x 10-14 m2 S-1 at 1200 K. The activation energy (in k. J.mole-1 ) for the diffusion of Ni in Cu is |
| A. | 130 |
| B. | 180 |
| C. | 230 |
| D. | 250 |
| Answer» D. 250 | |
| 1024. |
Blast furnace slag is mainly molten |
| A. | sand |
| B. | magnesium silicate |
| C. | calcium silicate |
| D. | iron pyrite |
| Answer» D. iron pyrite | |
| 1025. |
Aluminium oxide (an abrasive) is used for grinding |
| A. | ceramics |
| B. | high speed steel |
| C. | cemented carbide |
| D. | none of these |
| Answer» C. cemented carbide | |
| 1026. |
Slight displacement of a floating body in liquid makes it to oscillate about its |
| A. | centre of pressure. |
| B. | centre of gravity. |
| C. | metacentre. |
| D. | centre of pressure. |
| Answer» D. centre of pressure. | |
| 1027. |
Pick out the correct combination about the role of various additives used in polymers. |
| A. | Plasticiser : increases the polymer strength. |
| B. | Heat stabiliser : increases the maximum service temperature. |
| C. | Fillers: Does not affect the property of polymer but increases its weight. |
| D. | Lubricants: increases the flexibility of polymers. |
| Answer» D. Lubricants: increases the flexibility of polymers. | |
| 1028. |
Galvanic corrosion can not be prevented by |
| A. | cathodic protection. |
| B. | anodic protection. |
| C. | usage of largest possible anodic area. |
| D. | any one of these. |
| Answer» C. usage of largest possible anodic area. | |
| 1029. |
The most prominent single cause of corrosion in boilertubes, drums, economisers and steam superheaters in a thermal power plant boiler is the |
| A. | water alkalinity & leakage. |
| B. | hydrazine addition during feed water treatment. |
| C. | release of non-condensable gas from water in the boiler. |
| D. | scale formation. |
| Answer» D. scale formation. | |
| 1030. |
Classification of metal forming processes into hot and cold working is based on the following parameters. |
| A. | Stacking fault energy. |
| B. | Recrystallisation temperature. |
| C. | Solidus temperature. |
| D. | Transformation temperature. |
| Answer» C. Solidus temperature. | |
| 1031. |
Free oxygen is removed from boiler feed water, because it |
| A. | reduces heat transfer co-efficient. |
| B. | is corrosive. |
| C. | causes explosion. |
| D. | none of these. |
| Answer» C. causes explosion. | |
| 1032. |
Isotropic materials have the same __________ in all directions. |
| A. | induced stresses |
| B. | density |
| C. | elastic properties |
| D. | thermal properties |
| Answer» D. thermal properties | |
| 1033. |
Metal shots used in shot blasting are made of |
| A. | stellite |
| B. | steel |
| C. | bronze |
| D. | lead |
| Answer» C. bronze | |
| 1034. |
__________ is a special constituent of chlorophyll without which photosynthesis is not possible. |
| A. | Calcium |
| B. | Nitrogen |
| C. | Phosphorous |
| D. | Hydrogen |
| Answer» C. Phosphorous | |
| 1035. |
Young's modulus of elasticity of a material is the slope of the initial linear portion of the stress-strain curve. It decreases ap-preciablyby |
| A. | alloying additions |
| B. | heat treatment |
| C. | cold work |
| D. | increasing temperature |
| Answer» C. cold work | |
| 1036. |
Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam. |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | may increase or decrease |
| Answer» B. increases | |
| 1037. |
The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be$ |
| A. | 0.8 |
| B. | 1 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 1038. |
The driving force for the sintering of a powder compact is |
| A. | strain energy. |
| B. | surface energy. |
| C. | volume energy. |
| D. | stacking fault energy. |
| Answer» C. volume energy. | |
| 1039. |
Which of the following is a commonly used manometric liquid for low pressure range? |
| A. | Ethyl alcohol |
| B. | Carbon tetrachloride |
| C. | Glycerol |
| D. | Ethylene glycol |
| Answer» C. Glycerol | |
| 1040. |
In the commercial production of which of the following metals, matallothermic reduction is used ? |
| A. | Copper |
| B. | Zinc |
| C. | Zirconium |
| D. | Nickel |
| Answer» C. Zirconium | |
| 1041. |
A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action. |
| A. | proportional |
| B. | integral |
| C. | derivative |
| D. | none of these |
| Answer» C. derivative | |
| 1042. |
Which of the following is a neutral flux used in the pyrometallurgy of metal extraction? |
| A. | Quartz |
| B. | Flourspar |
| C. | Dolomite |
| D. | Manganese ore |
| Answer» C. Dolomite | |
| 1043. |
Gross & Net calorific values will be the same for |
| A. | methane |
| B. | propane |
| C. | carbon monoxide |
| D. | hydrogen |
| Answer» D. hydrogen | |
| 1044. |
L.D. converters are generally lined with |
| A. | magnesite |
| B. | fireclay |
| C. | chrome magnesite |
| D. | silica |
| Answer» D. silica | |
| 1045. |
The starting of a car takes time in winter, because the |
| A. | octane number of fuel is decreased. |
| B. | fuel supply for ignition is not sufficient. |
| C. | vaporisation of the fuel is decreased. |
| D. | pour point of fuel decreases. |
| Answer» D. pour point of fuel decreases. | |
| 1046. |
Out of the following, __________ pipe is the least corrosion resistant. |
| A. | mild steel |
| B. | copper |
| C. | wrought iron |
| D. | stainless steel |
| Answer» D. stainless steel | |
| 1047. |
Out of the following, the most ductile material is |
| A. | mild steel |
| B. | copper |
| C. | nickel |
| D. | aluminium |
| Answer» B. copper | |
| 1048. |
__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.$ |
| A. | Vaneering |
| B. | Galvanising |
| C. | Electroplating |
| D. | Calorising |
| Answer» E. | |
| 1049. |
Glycerene is used as a coolant in cooling of some engines instead of water, because |
| A. | its higher boiling point (290°C) increases its heat carrying capacity. |
| B. | compartively less weight of coolant is required. |
| C. | smaller radiator can be used. |
| D. | all a, b & c. |
| Answer» E. | |
| 1050. |
Fire refining process is employed in case of |
| A. | tin |
| B. | copper |
| C. | zinc |
| D. | aluminium |
| Answer» C. zinc | |