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.
| 551. |
_ There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.$? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | None of these |
| Answer» C. Three | |
| 552. |
_ Which of the following heat treatment processes is usually applied to castings ?$? |
| A. | Tempering |
| B. | Annealing |
| C. | Normalising |
| D. | Carburising |
| Answer» E. | |
| 553. |
_ The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is$? |
| A. | Conduction |
| B. | Convection |
| C. | Both A & B |
| D. | Radiation |
| Answer» E. | |
| 554. |
_ Out of the following, the materials having maximum magnetic permeability is$? |
| A. | Silicon steel (Si = 4%) |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Mild steel |
| Answer» B. Cast iron | |
| 555. |
_ The most important requirement for aluminium industry is the availability of cheap$? |
| A. | Ore |
| B. | Electrical power |
| C. | Labour |
| D. | & abundant water |
| Answer» C. Labour | |
| 556. |
_ Which of the following has the least oili-ness ?$? |
| A. | Mineral oils |
| B. | Vegetable oils |
| C. | Greases |
| D. | Animal oils |
| Answer» B. Vegetable oils | |
| 557. |
_ Wrought iron does not have$? |
| A. | Uniform strength in all directions |
| B. | Ability to hold protective coating |
| C. | High ductility & corrosion resistance |
| D. | Easily weldable characteristics |
| Answer» B. Ability to hold protective coating | |
| 558. |
_ The phenomenon of weld decay is found in case of$? |
| A. | Gun metal |
| B. | Brass |
| C. | Stainless steel |
| D. | Cast iron |
| Answer» E. | |
| 559. |
_ Unit of surface tension in S.I. unit is$? |
| A. | Watt/m |
| B. | Joule/m² |
| C. | Newton/m² |
| D. | Joule/m |
| Answer» C. Newton/m¬¨‚⧠| |
| 560. |
_ All of the following alloying elements of steel increases hardness but sacrifice ductility, except$? |
| A. | Nickel |
| B. | Vanadium |
| C. | Molybdenum |
| D. | Chromium |
| Answer» B. Vanadium | |
| 561. |
_ Feed check valve is used in steam boilers to$? |
| A. | Check the water level in the boiler |
| B. | Check the feed water flow rate |
| C. | Feed high pressure water to boiler and guard against its backflow through it |
| D. | None of these |
| Answer» D. None of these | |
| 562. |
_ The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.$? |
| A. | Refrigerant cooling |
| B. | Evaporator |
| C. | Condenser |
| D. | Throttling |
| Answer» D. Throttling | |
| 563. |
_ Non-ferrous alloys used for making cutting tools need not have high$? |
| A. | Abrasion resistance |
| B. | Toughness |
| C. | Red hardness |
| D. | Cutting speed |
| Answer» C. Red hardness | |
| 564. |
_ Material of construction of foundary crucible is$? |
| A. | Graphite |
| B. | Lead |
| C. | Porcelain |
| D. | Stainless steel |
| Answer» B. Lead | |
| 565. |
_ Which is the only metal that exists in liquid state at room temperature?$? |
| A. | Sodium |
| B. | Mercury |
| C. | Lithium |
| D. | Strontium |
| Answer» C. Lithium | |
| 566. |
_ Fluorine is not a constituent of$? |
| A. | Freon |
| B. | Chloroform |
| C. | Teflon |
| D. | Fluorocarbons |
| Answer» C. Teflon | |
| 567. |
_ Which of the following welding processes employs the highest welding temperature ?$? |
| A. | Arc welding |
| B. | Gas welding |
| C. | Thermit welding |
| D. | Resistance welding |
| Answer» E. | |
| 568. |
_ On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase.$? |
| A. | Ultimate tensile strength (UTS) |
| B. | Modulus of toughness |
| C. | Percent elongation |
| D. | Modulus of resilience |
| Answer» C. Percent elongation | |
| 569. |
_ Air refrigeration cycle is used in the air crafts, because of$? |
| A. | Low temperature encountered at high altitude |
| B. | Its high heat transfer rate |
| C. | Its low unit weight per ton of refrigeration |
| D. | Its higher co-efficient of performance (COP) |
| Answer» D. Its higher co-efficient of performance (COP) | |
| 570. |
_ The most important material handling system in an integrated steel plant is the$? |
| A. | Belt conveyor |
| B. | Diesel locomotive |
| C. | Truck |
| D. | Overhead hoists & cranes |
| Answer» C. Truck | |
| 571. |
_ Which of the following metals is the most prone to work hardening?$? |
| A. | Brass |
| B. | Aluminium |
| C. | Copper |
| D. | Lead |
| Answer» B. Aluminium | |
| 572. |
_ Materials used for making permanent magnets containing iron and nickel are made by __________ technique.$? |
| A. | Powder metallurgy |
| B. | Casting |
| C. | Forging |
| D. | None of these |
| Answer» D. None of these | |
| 573. |
_ A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.$? |
| A. | 150 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» C. 300 | |
| 574. |
_ Heat dissipation in cooling towers is mainly by$? |
| A. | Conduction |
| B. | Convection |
| C. | Evaporation |
| D. | Radiation |
| Answer» D. Radiation | |
| 575. |
_ Steels with high carbon equivalent have poor weldability, because in these steels during welding$? |
| A. | Carbon and other alloying elements get oxidised from the weld pool |
| B. | Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld |
| C. | Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld |
| D. | Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld |
| Answer» D. Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld | |
| 576. |
_ Grinding wheel made of silicon carbide is most suitable for grinding materials of low tensile strength (e.g; tough bronze). Grinding is a __________ operation.$? |
| A. | Turning |
| B. | Dressing |
| C. | Forming |
| D. | Surface finishing |
| Answer» E. | |
| 577. |
_ Which of the following is not categorised as the ore agglomeration process?$? |
| A. | Nodulising |
| B. | Pelletising |
| C. | Balling |
| D. | Briquetting |
| Answer» D. Briquetting | |
| 578. |
_ Identify the false statement$? |
| A. | Martensitic steels are less susceptible to pitting corrosion than austenitic steels |
| B. | Pitting corrosion is usually very localised |
| C. | Hydrogen embrittlement is facilitated by tensile stress |
| D. | Stress corrosion cracking is facilitated by tensile stress |
| Answer» B. Pitting corrosion is usually very localised | |
| 579. |
_ Commonly employed coolant for high pressure turbogenerator is$? |
| A. | Air |
| B. | Carbon dioxide |
| C. | Hydrogen |
| D. | Water |
| Answer» D. Water | |
| 580. |
_ __________ is a special constituent of chlorophyll without which photosynthesis is not possible.$? |
| A. | Calcium |
| B. | Nitrogen |
| C. | Phosphorous |
| D. | Hydrogen |
| Answer» C. Phosphorous | |
| 581. |
_ Malleabilisation heat treatment is performed on$? |
| A. | Cast steel |
| B. | Grey cast iron |
| C. | White cast iron |
| D. | Spheroidal graphite cast iron |
| Answer» D. Spheroidal graphite cast iron | |
| 582. |
_ In inventory control theory, the economic order quantity (EOQ) is the$? |
| A. | Lot size corresponding to break even analysis |
| B. | Average level of inventory |
| C. | Optimum lot size |
| D. | None of these |
| Answer» D. None of these | |
| 583. |
_ Satellites burn off during re-entry to earth's atmosphere, because of the$? |
| A. | Combustion with air |
| B. | Gravitational pull by earth |
| C. | Friction with earth's atmosphere |
| D. | Loss in weight of the satellite |
| Answer» D. Loss in weight of the satellite | |
| 584. |
_ With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.$? |
| A. | Supercharging |
| B. | Wall temperature |
| C. | Compression ratio |
| D. | Engine speed |
| Answer» E. | |
| 585. |
_ Direct conversion of thermal energy to electrical energy is facilitated by the$? |
| A. | Fuel cells |
| B. | Photo voltaic cell |
| C. | Magneto hydrodynamic generator |
| D. | None of these |
| Answer» D. None of these | |
| 586. |
_ LASER$? |
| A. | Stands for Light Amplification by Stimulated Emission of Radiation |
| B. | Has the same intensity as visible light |
| C. | Can't be used for cutting metals |
| D. | None of these |
| Answer» B. Has the same intensity as visible light | |
| 587. |
_ In 18-4-1 high speed steel, 18, 4 & 1 respectively denote the percentage of$? |
| A. | Chromium, tungsten & vanadium |
| B. | Tungsten, chromium & vanadium |
| C. | Tungsten, vanadium & chromium |
| D. | Tungsten, chromium & molybdenum |
| Answer» C. Tungsten, vanadium & chromium | |
| 588. |
_ Killed steels$? |
| A. | Are free from oxygen |
| B. | Contain not even traces of sulphur & phosphorous |
| C. | Are produced by L.D. process only |
| D. | Contain minimum impurity level |
| Answer» B. Contain not even traces of sulphur & phosphorous | |
| 589. |
_ Fahrenheit and Centigrade scales have the same readings at$? |
| A. | -55° |
| B. | -40° |
| C. | -33° |
| D. | -58° |
| Answer» C. -33¬¨‚àû | |
| 590. |
_ Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid ?$? |
| A. | p |
| B. | 2 p |
| C. | 0.5 p |
| D. | 0.25 p |
| Answer» C. 0.5 p | |
| 591. |
_ pH value of rain water in India ranges from$? |
| A. | 5.5 to 7.5 |
| B. | 8 to 9.5 |
| C. | 3.5 to 5 |
| D. | 9.5 to 10.5 |
| Answer» B. 8 to 9.5 | |
| 592. |
_ The machanism involved in the removal of metal in drilling operation is by$? |
| A. | Compression |
| B. | Extrusion |
| C. | Shearing |
| D. | Both A & C |
| Answer» E. | |
| 593. |
_ An ideal fluid is$? |
| A. | Viscous & incompressible |
| B. | Non-viscous & compressible |
| C. | Non-viscous & incompressible |
| D. | Viscous & compressible |
| Answer» D. Viscous & compressible | |
| 594. |
_ Electrometallurgy is not involved in the extraction of __________ from its ore.$? |
| A. | Aluminium |
| B. | Tin |
| C. | Lead |
| D. | Both B & C |
| Answer» E. | |
| 595. |
_ In the diving apparatus, helium is used along with oxygen, because it is$? |
| A. | Easily available |
| B. | Not soluble in blood at high pressure |
| C. | Lighter than nitrogen |
| D. | Completely miscible with oxygen |
| Answer» C. Lighter than nitrogen | |
| 596. |
_ Which of the following is not an explosive?$? |
| A. | TNT |
| B. | CMC |
| C. | RDX |
| D. | Lead azide |
| Answer» C. RDX | |
| 597. |
_ An abrupt and sudden fall in the readinp of barometer is an indication of the$? |
| A. | Storm |
| B. | Rain |
| C. | Clear weather |
| D. | Cold wave |
| Answer» B. Rain | |
| 598. |
_ In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?$? |
| A. | Zirconia |
| B. | Alumina |
| C. | Bakelite |
| D. | Tungsten carbide |
| Answer» E. | |
| 599. |
_ Induced draft fans provided in large thermal power plant boilers have __________ blades.$? |
| A. | Forward curved |
| B. | Backward curved |
| C. | Double curved |
| D. | Radial or straight |
| Answer» C. Double curved | |
| 600. |
_ In the floatation process, pine oil is used as the$? |
| A. | Collector |
| B. | Activator |
| C. | Frother |
| D. | Depressant |
| Answer» D. Depressant | |