MCQOPTIONS
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MCQOPTIONS
This section includes 1175 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 951. |
Semi-conductors normally employ __________ bonding.$? |
| A. | Co-ordinate |
| B. | Ionic |
| C. | Covalant |
| D. | Metallic |
| Answer» D. Metallic | |
| 952. |
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?$? |
| A. | Cobalt: It contributes to rerl hardness by hardening ferrite |
| B. | Molybdenum: It forms abrasion resisting particles |
| C. | Phosphorous: It improves machinability in free cutting steels |
| D. | Silicon: It reduces oxidation resistance |
| Answer» B. Molybdenum: It forms abrasion resisting particles | |
| 953. |
The most suitable material for die casting is$? |
| A. | Iron |
| B. | Copper |
| C. | Steel |
| D. | Nickel |
| Answer» C. Steel | |
| 954. |
Acetylene should never be conveyed through __________ pipe, as it forms an unstable compound that dissociates violently at the slightest shock.$? |
| A. | Stainless steel |
| B. | Copper |
| C. | Aluminium |
| D. | Brass |
| Answer» C. Aluminium | |
| 955. |
A material expanding freely due to heating will develop __________ stress.$? |
| A. | No |
| B. | Compressive |
| C. | Tensile |
| D. | Thermal |
| Answer» B. Compressive | |
| 956. |
In an isochoric process,$? |
| A. | There is no transfer of mass and energy |
| B. | Free expansion of an ideal gas occurs |
| C. | No mechanical work is done by the system |
| D. | All of the above |
| Answer» D. All of the above | |
| 957. |
The rolling process can not be used to produce$? |
| A. | Plates |
| B. | Rods |
| C. | Tubes |
| D. | Wires |
| Answer» D. Wires | |
| 958. |
Fibre reinforced plastic (FRP) are$? |
| A. | Made of glass fibre and thermoplastic resins |
| B. | Anisotropic |
| C. | Made of thermosetting resin and glass fibre |
| D. | Both B and C |
| Answer» E. | |
| 959. |
Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.$? |
| A. | Fracture |
| B. | Dislocation |
| C. | Slip |
| D. | Twinning |
| Answer» D. Twinning | |
| 960. |
Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?$? |
| A. | Airpreheater |
| B. | Economiser |
| C. | Steam superheater |
| D. | Furnace water wall |
| Answer» B. Economiser | |
| 961. |
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.$? |
| A. | Copper |
| B. | Steel |
| C. | Aluminium |
| D. | Brass |
| Answer» B. Steel | |
| 962. |
The Al2 O‚ÇÉ content of cryolite in Hall-Heroult's cell is maintained between __________ percent.$? |
| A. | 2-5 |
| B. | 18-20 |
| C. | 12-15 |
| D. | 6-12 |
| Answer» B. 18-20 | |
| 963. |
Maraging steels derive their strength from the following mechanism:$? |
| A. | A fine, highly dislocated and strong martensite |
| B. | Fine dispersions of intermetallics of Fe, Ni, Ti etc |
| C. | Fine dispersions of alloy carbides in a ferrite matrix |
| D. | Fine dispersions of Fe‚ÇÉ C nucleated on dislocations in austenite |
| Answer» B. Fine dispersions of intermetallics of Fe, Ni, Ti etc | |
| 964. |
Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight$? |
| A. | 1.5 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» C. 5 | |
| 965. |
Natural water contains approximately __________ percent of heavy water.$? |
| A. | 0.015 |
| B. | 0.71 |
| C. | 1.2 |
| D. | 3.5 |
| Answer» B. 0.71 | |
| 966. |
The process of removal of scale formed during hot rolling of steel is termed as$? |
| A. | Descaling |
| B. | Shot blasting |
| C. | Pickling |
| D. | Skimming |
| Answer» D. Skimming | |
| 967. |
Encyclopaedia of Chemical Technology has been$? |
| A. | Authored by Kirk Othmer |
| B. | Edited by Perry and Chilton |
| C. | Edited by Kirk Othmer |
| D. | Authored by Perry and Chilton |
| Answer» D. Authored by Perry and Chilton | |
| 968. |
Production of a hollow product by inflation of a tube or parison is called the __________ process.$? |
| A. | Blow moulding |
| B. | Calendering |
| C. | Extrusion |
| D. | Injection |
| Answer» B. Calendering | |
| 969. |
Machinability of hard alloys and tool steels is improved by$? |
| A. | Spherodising |
| B. | Annealing |
| C. | Tempering |
| D. | Normalising |
| Answer» C. Tempering | |
| 970. |
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.$? |
| A. | Evaporative capacity |
| B. | Evaporation efficiency |
| C. | Thermal efficiency |
| D. | Steam load |
| Answer» B. Evaporation efficiency | |
| 971. |
In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that$? |
| A. | Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller |
| B. | Maintaining vacuum on tube side is more difficult than that on the shell side |
| C. | Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam |
| D. | Condenser can act as a storage unit for condensed steam |
| Answer» D. Condenser can act as a storage unit for condensed steam | |
| 972. |
With increase in temperature, the electrical conductivity of semiconductors$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Either A or B, depends on the type of semi-conductor |
| Answer» B. Decreases | |
| 973. |
Corrosion is$? |
| A. | A physical phenomenon |
| B. | A chemical phenomenon |
| C. | Same as erosion |
| D. | An uncontrollable phenomenon |
| Answer» C. Same as erosion | |
| 974. |
Tip of the match stick contains a mixture of$? |
| A. | K + S |
| B. | K + S + K‚ÇÇCr‚ÇÇO‚Çá |
| C. | S + K‚ÇÇCr‚ÇÇO‚Çá + White P |
| D. | None of these |
| Answer» D. None of these | |
| 975. |
Colloids can be purified by$? |
| A. | Dialysis |
| B. | Reverse osmosis |
| C. | Coagulation |
| D. | Peptization |
| Answer» B. Reverse osmosis | |
| 976. |
Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)$? |
| A. | A |
| B. | L |
| C. | A² |
| D. | Both A & B |
| Answer» E. | |
| 977. |
The trace metal present in insulin is$? |
| A. | Cu |
| B. | Zn |
| C. | Fe |
| D. | Ni |
| Answer» C. Fe | |
| 978. |
Which of the following manufacturing processes produces the strongest components ?$? |
| A. | Forging |
| B. | Cold rolling |
| C. | Hot rolling |
| D. | Die casting |
| Answer» B. Cold rolling | |
| 979. |
Cascade control is$? |
| A. | The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller |
| B. | Used when changes in process conditions cause serious upsets in the controlled variable |
| C. | Useful to control flow from temperature |
| D. | All of the above |
| Answer» E. | |
| 980. |
Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of$? |
| A. | 90% tungsten carbide and 10% cobalt |
| B. | 70% aluminium oxide & 30% silica |
| C. | 30% nickel, 15% chromium & 55% tungsten |
| D. | 65% tungsten & 35% zirconium |
| Answer» B. 70% aluminium oxide & 30% silica | |
| 981. |
Transformer cores are normally made from$? |
| A. | Soft ferrites |
| B. | High purity iron |
| C. | Grain oriented Fe-Si alloy |
| D. | Al-Ni-Co alloy |
| Answer» D. Al-Ni-Co alloy | |
| 982. |
Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.$? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 40 |
| Answer» E. | |
| 983. |
Pearlite comprises of$? |
| A. | 87% cementite & 13% Fe |
| B. | 87% ferrite & 13% cementite |
| C. | 93.33% ferrite & 6.67% C |
| D. | 87% ferrite & 13% C |
| Answer» C. 93.33% ferrite & 6.67% C | |
| 984. |
Piezoelectric is a material$? |
| A. | Whose properties is midway between the constituent materials |
| B. | Which gets polarised, when stressed |
| C. | In which magnetising force reduces when current flowing through it is in-cresed |
| D. | Which changes dimensions due to applied field |
| Answer» C. In which magnetising force reduces when current flowing through it is in-cresed | |
| 985. |
Plasma is$? |
| A. | A high temperature neutral gas |
| B. | Nothing but ionised gas |
| C. | A source of steady and highest controllable pressure |
| D. | Formed at very low temperature |
| Answer» C. A source of steady and highest controllable pressure | |
| 986. |
A spring material should have low$? |
| A. | Elastic limit |
| B. | Deflection value |
| C. | Fatigue resistance |
| D. | None of these |
| Answer» E. | |
| 987. |
Addition of beryllium to copper is done mainly to produce a/an __________ alloy.$? |
| A. | Non-sparking & non-magnetic |
| B. | High strength |
| C. | Precipitation hardenable |
| D. | Corrosion resistant |
| Answer» B. High strength | |
| 988. |
Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel.$? |
| A. | 0.01 to 0.10 |
| B. | 0.2 to 0.4 |
| C. | 0.5 to 0.7 |
| D. | 0.8 to 1.0 |
| Answer» C. 0.5 to 0.7 | |
| 989. |
__________ of austenite decreases the hardenability in steel.$? |
| A. | Fine grains |
| B. | Coarse grains |
| C. | Homogeneity |
| D. | Dissolved elements (except cobalt) |
| Answer» E. | |
| 990. |
Window panes of aeroplanes are normally made of$? |
| A. | Perspex (PMMA) |
| B. | Teflon (PTFE) |
| C. | Bakelite (phenol formaldehyde) |
| D. | Polystyrene |
| Answer» B. Teflon (PTFE) | |
| 991. |
Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?$? |
| A. | Quartz |
| B. | Flourspar |
| C. | Dolomite |
| D. | Manganese ore |
| Answer» C. Dolomite | |
| 992. |
Desalination of water$? |
| A. | Makes it potable |
| B. | Makes it non-potable |
| C. | Means distillation of water |
| D. | None of these |
| Answer» B. Makes it non-potable | |
| 993. |
Diamagnetic materials$? |
| A. | Are magnetised by eddy currents only |
| B. | Are non-magnetic and can not be magnetised |
| C. | Are magnetised in direction opposite to the magnetic field |
| D. | Can be magnetised in one direction only |
| Answer» D. Can be magnetised in one direction only | |
| 994. |
Baffles provided on the shell side of a shell and tube heat exchanger are meant for$? |
| A. | Providing support for the tubes |
| B. | Improving heat transfer |
| C. | Both A & B |
| D. | Preventing the fouling of tubes & stagnation of shell side fluid |
| Answer» D. Preventing the fouling of tubes & stagnation of shell side fluid | |
| 995. |
Which of the following commonly used condenser tube materials has the lowest thermal conductivity?$? |
| A. | Admirability brass |
| B. | Stainless steel |
| C. | Aluminium brass |
| D. | Titanium |
| Answer» C. Aluminium brass | |
| 996. |
Globular form of cementite is formed during the __________ process.$? |
| A. | Spherodising |
| B. | Hardening |
| C. | Annealing |
| D. | Normalising |
| Answer» C. Annealing | |
| 997. |
Dowtherm is a$? |
| A. | High temperature heating medium (a petroleum product) |
| B. | Product of coal tar distillation |
| C. | Very heat sensitive material |
| D. | None of these |
| Answer» B. Product of coal tar distillation | |
| 998. |
Nitriding of steel is a process for$? |
| A. | Case hardening |
| B. | Spheroidising |
| C. | Normalising |
| D. | Annealing |
| Answer» B. Spheroidising | |
| 999. |
During brazing, if the fluxes are entrapped, it results in the$? |
| A. | Distortion of brazed joints |
| B. | Cracking of joints |
| C. | Presence of gas pockets |
| D. | Corrosion |
| Answer» E. | |
| 1000. |
Enzymes belong to the category of$? |
| A. | Proteins |
| B. | Carbohydrates |
| C. | Vitamins |
| D. | Fats |
| Answer» B. Carbohydrates | |