MCQOPTIONS
Saved Bookmarks
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.
| 901. |
Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is$? |
| A. | R ln 2 |
| B. | -R ln 2 |
| C. | 3 R ln 2 |
| D. | -3R ln 2 |
| Answer» B. -R ln 2 | |
| 902. |
Ferrites are __________ magnetic.$? |
| A. | Anti |
| B. | Para |
| C. | Ferri |
| D. | Ferro |
| Answer» D. Ferro | |
| 903. |
The cathode in an electrochemical cell always carries$? |
| A. | Negative charge |
| B. | Positive charge |
| C. | Zero charge |
| D. | Positive or negative charge depending upon the nature of the cell |
| Answer» B. Positive charge | |
| 904. |
Powder metallurgy technique is used in the production of __________ tools.$? |
| A. | Tungsten carbide |
| B. | High carbon steel |
| C. | High speed steel |
| D. | Drilling |
| Answer» B. High carbon steel | |
| 905. |
The function of a nozzle provided in steam turbine is to$? |
| A. | Throttle down (i.e., reduce) the pressure of steam |
| B. | Convert internal energy into kinetic energy |
| C. | Increase the velocity of steam |
| D. | All of the above |
| Answer» E. | |
| 906. |
Dry saturated steam can be converted into superheated steam by$? |
| A. | Increasing its cross-sectional area of flow |
| B. | Passing it through a pressure reducing valve |
| C. | Forcing it downwards through a vertical tube |
| D. | None of these |
| Answer» C. Forcing it downwards through a vertical tube | |
| 907. |
Gas turbine normally employs a constant __________ cycle.$? |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | None of these |
| Answer» B. Temperature | |
| 908. |
Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher$? |
| A. | Ductility |
| B. | Impact strength |
| C. | Machinability |
| D. | Melting point |
| Answer» D. Melting point | |
| 909. |
Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ?$? |
| A. | Copper |
| B. | Zinc |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 910. |
Holes for rivetting purposes should be preferably made by$? |
| A. | Cutting torch |
| B. | Drilling |
| C. | Punching |
| D. | None of these |
| Answer» C. Punching | |
| 911. |
Solution loss reaction occurs$? |
| A. | In the blast furnace shaft |
| B. | During pretreatment of hot metal |
| C. | In the L.D. process |
| D. | During deoxidation in the ladle |
| Answer» B. During pretreatment of hot metal | |
| 912. |
The same volume of all gases is representative of their$? |
| A. | Specific gravities |
| B. | Densities |
| C. | Gas characteristic constants |
| D. | Molecular weights |
| Answer» E. | |
| 913. |
In a titration involving weak acid and strong base, the preferred indicator is$? |
| A. | Methyl orange |
| B. | Phenolphthalein |
| C. | Ethyl orange |
| D. | Fehling's solution |
| Answer» C. Ethyl orange | |
| 914. |
Uniform ramming of sand in green sand moulding process leads to$? |
| A. | Reduced chance of gas porosity |
| B. | Greater dimensional stability of the casting |
| C. | Uniform flow of molten metal into the mould cavity |
| D. | Less sand expansion type of casting defect |
| Answer» C. Uniform flow of molten metal into the mould cavity | |
| 915. |
__________ has the highest melting point out of the following.$? |
| A. | Tungsten |
| B. | Zirconium |
| C. | Molybdenum |
| D. | Tantalum |
| Answer» B. Zirconium | |
| 916. |
The specific gravity of coal depends mainly on its __________ content.$? |
| A. | Carbon |
| B. | Volatile matter |
| C. | Ash |
| D. | Moisture |
| Answer» E. | |
| 917. |
Current employed in resistance welding ranges from __________ kVA/cm² .$? |
| A. | 1.2 to 2.5 |
| B. | 4.5 to 6.2 |
| C. | 7.5 to 8.5 |
| D. | 10.5 to 15.5 |
| Answer» C. 7.5 to 8.5 | |
| 918. |
At 100% relative humidity, the dew point temperature of moist air is$? |
| A. | Less than the wet bulb temperature |
| B. | More than the wet bulb temperature |
| C. | Equal to the wet bulb temperature |
| D. | Equal to the ambient temperature |
| Answer» C. Equal to the wet bulb temperature | |
| 919. |
Turning/machining of __________ usually does not require any cutting fluid.$? |
| A. | Cast iron |
| B. | Stainless steel |
| C. | Mild steel |
| D. | Copper |
| Answer» B. Stainless steel | |
| 920. |
The leaching solvent used in Baeyer's process for the purification of bauxite is$? |
| A. | Ammonium hydroxide |
| B. | Sodium carbonate |
| C. | Sodium hydroxide |
| D. | Ammonium carbonate |
| Answer» C. Sodium hydroxide | |
| 921. |
Cementite is in the lamellar form in the __________ phase of steel.$? |
| A. | Martensitic |
| B. | Bainitic |
| C. | Pearlitic |
| D. | Ferritic |
| Answer» D. Ferritic | |
| 922. |
The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.$? |
| A. | Red |
| B. | Extended |
| C. | Super |
| D. | Extreme |
| Answer» D. Extreme | |
| 923. |
The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the$? |
| A. | Resilience |
| B. | Toughness |
| C. | Ductility |
| D. | Impact strength |
| Answer» B. Toughness | |
| 924. |
Pick out the wrong statement about nucleate boiling.$? |
| A. | Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface |
| B. | Surface temperature is greater than the saturation temperature of the liquid |
| C. | Heat transfer from the surface of the liquid is less than that in film boiling |
| D. | The temperature is less than that of film boiling |
| Answer» E. | |
| 925. |
High __________ of cast iron makes it suitable for use in machine beds.$? |
| A. | Compressive strength |
| B. | Endurance strength |
| C. | Damping capacity |
| D. | Tensile strength |
| Answer» B. Endurance strength | |
| 926. |
Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal$? |
| A. | Tensile strength |
| B. | Compressive strength |
| C. | Young's modulus |
| D. | Thermal co-efficient of expansion |
| Answer» E. | |
| 927. |
Oxide layer formed on the non-ferrous metal surface after its annealing is$? |
| A. | Removed by acid pickling |
| B. | Hammered into the surface |
| C. | Removed with coarse emery cloth |
| D. | Left as such to protect the surface |
| Answer» B. Hammered into the surface | |
| 928. |
Diamond does not conduct electricity, because$? |
| A. | Its structure is very compact |
| B. | No free electrons are present |
| C. | It is of crystalline nature |
| D. | There are only carbon atoms present |
| Answer» C. It is of crystalline nature | |
| 929. |
Number of electrons in the outermost orbit of a semi-conductor is$? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 930. |
A machine having assumed life of 20 years is purchased for Rs 32000/-. Its scrap value at the end of its life is Rs 8000/-. If the depreciation is calculated by diminishing balance method, then percentage reduction in its value at the end of first year is __________ percent.$? |
| A. | 6.7 |
| B. | 7.6 |
| C. | 10.3 |
| D. | 15.2 |
| Answer» B. 7.6 | |
| 931. |
The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively$? |
| A. | 7 and 30 |
| B. | 10 and 50 |
| C. | 2 and 50 |
| D. | 13 and 55 |
| Answer» D. 13 and 55 | |
| 932. |
Monazite deposits constitute an important source for the following metal.$? |
| A. | Thorium |
| B. | Titanium |
| C. | Molybdenum |
| D. | None of the above |
| Answer» B. Titanium | |
| 933. |
Which of the following is an unconventional source of energy ?$? |
| A. | Thermal power |
| B. | Hydroelectric power |
| C. | Nuclear-fusion power |
| D. | Solar power |
| Answer» E. | |
| 934. |
The single most imortant requirement for a turbine blade material is$? |
| A. | Damping |
| B. | Resilience |
| C. | Creep resistaned |
| D. | DBTT |
| Answer» D. DBTT | |
| 935. |
__________ is a non volatile film forming constituent of a paint.$? |
| A. | Thinner |
| B. | Dryer |
| C. | Drying oil |
| D. | None of these |
| Answer» D. None of these | |
| 936. |
Potable water means the water used for$? |
| A. | Fire-fighting |
| B. | Cooling |
| C. | Drinking |
| D. | Evaporation to produce steam |
| Answer» D. Evaporation to produce steam | |
| 937. |
Expansion device used in a window air-conditioner is a/an$? |
| A. | Automatic expansion valve |
| B. | Thermostatic expansion valve |
| C. | Float valve |
| D. | Capillary tube |
| Answer» E. | |
| 938. |
Minimum thermal efficiency of a steam boiler may be around __________ percent$? |
| A. | 25 |
| B. | 45 |
| C. | 65 |
| D. | 20 |
| Answer» E. | |
| 939. |
Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?$? |
| A. | Cresylic acid |
| B. | Xanthaies |
| C. | Pine oil |
| D. | All of the above |
| Answer» C. Pine oil | |
| 940. |
In the acid Bessemer process, the hot metal should have the following com-positon.$? |
| A. | S < 0.05% and P < 0.05% |
| B. | S < 0.05% and P < 1.5% |
| C. | S < 0.05% and P > 1.5% |
| D. | S > 1.5% and P < 0.05% |
| Answer» B. S < 0.05% and P < 1.5% | |
| 941. |
The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.$? |
| A. | Two |
| B. | Four |
| C. | Six |
| D. | Eight |
| Answer» B. Four | |
| 942. |
The hardenability of steel decreases with$? |
| A. | Decrease in dislocation density |
| B. | Increase in solutionising temperature |
| C. | Increase in strength |
| D. | Decrease in grain size |
| Answer» E. | |
| 943. |
__________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.$? |
| A. | Electrical resistance |
| B. | Electroslag |
| C. | Plasma torch |
| D. | Submerged arc |
| Answer» C. Plasma torch | |
| 944. |
With increase in compression ratio, the volumetric efficiency of air compressor$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease (depends on the suction pressure) |
| Answer» B. Decreases | |
| 945. |
__________ furnace is generally used in the non-ferrous foundaries.$? |
| A. | Direct arc |
| B. | Indirect arc |
| C. | Resistance |
| D. | Induction |
| Answer» C. Resistance | |
| 946. |
The material used for coating the welding electrode is termed as the$? |
| A. | Flux |
| B. | Slag |
| C. | Protective layer |
| D. | Binder |
| Answer» C. Protective layer | |
| 947. |
Lubricants can be used to$? |
| A. | Transmit power hydraulically |
| B. | Form a seal in compressors |
| C. | Remove contaminants by flushing and to insulate transformers, switchgears etc |
| D. | All of the above |
| Answer» E. | |
| 948. |
Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)?$? |
| A. | Styrofoam |
| B. | Lucite |
| C. | Perspex |
| D. | Plexiglass |
| Answer» B. Lucite | |
| 949. |
In which of the following reactions, application of vacuum will help ?$? |
| A. | Number of gas molecules in the product side is more than that on the reactant side |
| B. | Number of gas molecules in the reactant side is more than that on the product side |
| C. | Number of gas molecules are the same on both the reactant & the product side |
| D. | None of the above |
| Answer» E. | |
| 950. |
Maximum hardenability of steel depends upon its$? |
| A. | Chemical composition |
| B. | Carbon content |
| C. | Grain size |
| D. | Alloying elements content |
| Answer» E. | |