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.
| 701. |
__Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be__ |
| A. | 9.5:1 |
| B. | 12.5:1 |
| C. | 15.5 :1 |
| D. | 18.5 : 1 |
| Answer» B. 12.5:1 | |
| 702. |
__Dew point of air indicates its__ |
| A. | Moisture content |
| B. | Dryness |
| C. | Latent heat |
| D. | Coolness |
| Answer» B. Dryness | |
| 703. |
__Reynolds number of a fluid flowing in a circular pipe is 10000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?__ |
| A. | 9100 |
| B. | 13000 |
| C. | 7000 |
| D. | 2550 |
| Answer» B. 13000 | |
| 704. |
__Iron content in Indian iron ore is about __________ percent.__ |
| A. | 80-85 |
| B. | 60-65 |
| C. | 40-45 |
| D. | 20-25 |
| Answer» C. 40-45 | |
| 705. |
__The main constituent of bones is__ |
| A. | CaF‚ÇÇ |
| B. | Ca‚ÇÉ(PO‚ÇÑ)‚ÇÇ |
| C. | CaCO‚ÇÉ |
| D. | CaCl‚ÇÇ |
| Answer» C. CaCO‚Äö√á√â | |
| 706. |
__The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.__ |
| A. | Carbon |
| B. | Manganese |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» B. Manganese | |
| 707. |
__Often earing defects are found during deep drawing operation, because the__ |
| A. | Surface finish of the sheet is poor |
| B. | Sheet material has been given substantial spring back |
| C. | Starting sheet has planer anisotropy due to its texture |
| D. | Starting sheet has normal anitropy due to its texture |
| Answer» D. Starting sheet has normal anitropy due to its texture | |
| 708. |
__A dense structure of grinding wheel is not used for the__ |
| A. | Ductile material |
| B. | Hard materials |
| C. | Brittle materials |
| D. | Finishing cuts |
| Answer» B. Hard materials | |
| 709. |
__Which of the following is a disaccharide?__ |
| A. | Lactose |
| B. | Starch |
| C. | Cellulose |
| D. | Fructose |
| Answer» B. Starch | |
| 710. |
__The maximum value, which the residual stress in a material can reach is the __________ of the material.__ |
| A. | Elastic limit |
| B. | Plastic limit |
| C. | Yield stress |
| D. | Breaking stress |
| Answer» B. Plastic limit | |
| 711. |
__Upto the critical radius of insulation, added insulation, will__ |
| A. | Increase the heat loss |
| B. | Decrease heat loss and will have no effect beyond that |
| C. | Decrease heat flux |
| D. | Reduce convection heat loss compared to conduction heat less |
| Answer» C. Decrease heat flux | |
| 712. |
__The product (s) of roasting of a sulphide ore is (are)__ |
| A. | Oxide only |
| B. | Sulphate only |
| C. | Oxide and sulphate |
| D. | Dependent on temperature and partial pressure of oxygen & sulphur dioxide |
| Answer» B. Sulphate only | |
| 713. |
__Out of the following, the highest emf for a given temperature is generated by the __________ thermocouple.__ |
| A. | Chromel - alumel |
| B. | Iron - constantan |
| C. | Platinum - platinum + rhodium |
| D. | Copper-constantan |
| Answer» C. Platinum - platinum + rhodium | |
| 714. |
__Current asset of a factory includes the__ |
| A. | Goodwill of the company |
| B. | Common stocks held by the company |
| C. | Manufacturing plant & equipment |
| D. | Inventory |
| Answer» D. Inventory | |
| 715. |
__Desert air coolers being rendered ineffective in rainy season is due to__ |
| A. | Low humidity |
| B. | Low temperature |
| C. | High humidity |
| D. | Sunny weather |
| Answer» D. Sunny weather | |
| 716. |
__The instrument based on the following principle is used for the measurement of oxygen only in the flue gases.__ |
| A. | Chemical absorption |
| B. | Thermal conductivity |
| C. | Infrared absorption |
| D. | Paramagnetism |
| Answer» E. | |
| 717. |
__Commonly used flux for brazing is__ |
| A. | Zinc chloride |
| B. | Borax |
| C. | Ammonium chloride |
| D. | Rosin |
| Answer» C. Ammonium chloride | |
| 718. |
__Overheating of satellites during re-entry to earth is controlled by__ |
| A. | Thick insulation |
| B. | Ceramic lining |
| C. | Cooling by flow of air over the surface |
| D. | None of these |
| Answer» D. None of these | |
| 719. |
__RADAR is__ |
| A. | Acronym for Radio Detection and Ranging |
| B. | Name of technique for locating distant objects |
| C. | Name of instrument for locating distant objects |
| D. | All of the above |
| Answer» E. | |
| 720. |
__Lead is poured into the joint between two __________ pipes.__ |
| A. | Mild steel |
| B. | Concrete |
| C. | Cast iron |
| D. | Asbestos cement |
| Answer» D. Asbestos cement | |
| 721. |
__A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its__ |
| A. | Aqueous tension |
| B. | Saturated humidity |
| C. | Vapor pressure |
| D. | Absolute humidity |
| Answer» B. Saturated humidity | |
| 722. |
__The tensile strength of plastics ranges from __________ kg/mm².__ |
| A. | 10 to 50 |
| B. | 50 to 100 |
| C. | 0.01 to 0.1 |
| D. | 0.1 to 10 |
| Answer» E. | |
| 723. |
__Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to__ |
| A. | Avoid the overheating of the tubes & bellows which operate them to minimise error and damage |
| B. | Form a seal of water by steam condensate to fill the tube or bellows at the pressure being measured |
| C. | Both 'a' & 'b' |
| D. | Avoid the static head error introduced by steam entry |
| Answer» D. Avoid the static head error introduced by steam entry | |
| 724. |
__The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.__ |
| A. | Wetness |
| B. | Mass flow rate |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 725. |
__Metalloids__ |
| A. | Are good conductor of heat & electricity |
| B. | Act as electron donors with metals & as electron acceptor with non-metals |
| C. | Are not necessarily solids at room temperature |
| D. | Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron |
| Answer» E. | |
| 726. |
__'End cooler' or 'after cooler' is employed in air compressor mainly to__ |
| A. | Remove oil vapour or moisture from air |
| B. | Cool the dry air before use |
| C. | Reduce the volumetric capacity of receiver |
| D. | None of these |
| Answer» B. Cool the dry air before use | |
| 727. |
__Out of the following __________ iron has the best capability to bear sudden & excessive shocks.__ |
| A. | White |
| B. | Cast |
| C. | Wrought |
| D. | Pig |
| Answer» D. Pig | |
| 728. |
__Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.__ |
| A. | Slip |
| B. | Fracture |
| C. | Winning |
| D. | Dislocation |
| Answer» E. | |
| 729. |
__Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.__ |
| A. | Working |
| B. | Bearing |
| C. | Yield |
| D. | None of these |
| Answer» B. Bearing | |
| 730. |
__Ignition of fuel in a diesel engine is by__ |
| A. | Spark |
| B. | Hot compressed air |
| C. | Fuel injection |
| D. | None of these |
| Answer» C. Fuel injection | |
| 731. |
__The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.__ |
| A. | Pulverised fuel |
| B. | Travelling grate stoker firing |
| C. | Circulating fluidised bed |
| D. | Fluidised bed |
| Answer» B. Travelling grate stoker firing | |
| 732. |
__Two stroke engine compared to a four stroke engine has__ |
| A. | Higher efficiency |
| B. | Less fuel consumption |
| C. | Higher power to weight ratio |
| D. | Lower initial cost |
| Answer» D. Lower initial cost | |
| 733. |
____________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten.__ |
| A. | Stellite |
| B. | High speed steel |
| C. | Cermet |
| D. | Alnico |
| Answer» B. High speed steel | |
| 734. |
__Silicon crystal can be converted to p-type semi-conductor by doping with__ |
| A. | Phosphorous |
| B. | Nitrogen |
| C. | Carbon |
| D. | Boron |
| Answer» E. | |
| 735. |
__According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.__ |
| A. | 0.5 |
| B. | 2 |
| C. | ‚à ö2 |
| D. | ‚à ö3/2 |
| Answer» B. 2 | |
| 736. |
__The maximum percentage of chromium that can be added to steel is about__ |
| A. | 12 |
| B. | 18 |
| C. | 24 |
| D. | 30 |
| Answer» C. 24 | |
| 737. |
__A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will__ |
| A. | Increase |
| B. | Decrease |
| C. | Remain unaffected |
| D. | May increase or decrease; depends on the thickness of each layer |
| Answer» D. May increase or decrease; depends on the thickness of each layer | |
| 738. |
_Speisses is a mixture of the following:$? |
| A. | Arsenides of heavy metals |
| B. | Antimonides of heavy metals |
| C. | Arsenides & antimonides of heavy metals |
| D. | Iron, cobalt and nickel |
| Answer» B. Antimonides of heavy metals | |
| 739. |
_Main alloying element in Elinvar used in precision instruments, hair springs for watches etc. is$? |
| A. | Chromium |
| B. | Nickel |
| C. | Zinc |
| D. | Aluminium |
| Answer» C. Zinc | |
| 740. |
_Magnesium addition to cast iron increases its$? |
| A. | Corrosion resistance |
| B. | Creep strength |
| C. | Ductility and strength in tension |
| D. | Hardness |
| Answer» D. Hardness | |
| 741. |
_At absolute zero temperature, for any reaction involving condensed phases$? |
| A. | Δ G° = 0 , Δ H° = 0 |
| B. | Δ H° = 0 , Δ S° = 0 |
| C. | Δ S° = 0 , Δ E° = 0 |
| D. | Δ S° = 0 , Δ Cp° = 0 |
| Answer» D. ≈í√Æ S¬¨‚àû = 0 , ≈í√Æ Cp¬¨‚àû = 0 | |
| 742. |
_Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.$? |
| A. | 18 |
| B. | 16 |
| C. | 14 |
| D. | 12 |
| Answer» C. 14 | |
| 743. |
_It is possible to form martensite$? |
| A. | Sometimes by cold working |
| B. | Sometimes without nucleation |
| C. | Sometimes by gas quenching |
| D. | Only in iron based alloys |
| Answer» E. | |
| 744. |
_Stoneware pipes used for sewers for carrying sewage normally is joined by __________ joint.$? |
| A. | Spigot and socket |
| B. | Flanged iron |
| C. | Collar |
| D. | Expansion |
| Answer» B. Flanged iron | |
| 745. |
_Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.$? |
| A. | Hot rolled mild |
| B. | Cold rolled mild |
| C. | Forged |
| D. | Machinable stainless |
| Answer» C. Forged | |
| 746. |
_Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?$? |
| A. | Aluminium |
| B. | Copper |
| C. | Titanium |
| D. | Stainless steel |
| Answer» D. Stainless steel | |
| 747. |
___________ is not used as the control rod material in a nuclear reactor.$? |
| A. | Cobalt |
| B. | Hafnium |
| C. | Cadmium |
| D. | Boron |
| Answer» B. Hafnium | |
| 748. |
_In a fuel cell, chemical energy is converted into$? |
| A. | Electrical energy directly |
| B. | Mechanical energy |
| C. | Electrical energy and stored therein |
| D. | None of these |
| Answer» B. Mechanical energy | |
| 749. |
_Metalloids$? |
| A. | Are good conductor of heat & electricity |
| B. | Act as electron donors with metals & as electron acceptor with non-metals |
| C. | Are not necessarily solids at room temperature |
| D. | Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron |
| Answer» E. | |
| 750. |
_Lead pencil contains$? |
| A. | Graphite |
| B. | Lead sulphide |
| C. | Lead |
| D. | Both B & C |
| Answer» B. Lead sulphide | |