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.
| 1851. |
Thermit welding uses the following energy source. |
| A. | Electrical energy. |
| B. | Chemical energy. |
| C. | Energy of high velocity electrons. |
| D. | Heat generated by friction. |
| Answer» C. Energy of high velocity electrons. | |
| 1852. |
Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching. |
| A. | grey |
| B. | red |
| C. | orange |
| D. | violet |
| Answer» C. orange | |
| 1853. |
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. | |
| 1854. |
Absolute zero pressure can be attained at a temperature of |
| A. | 0°C |
| B. | 50°K |
| C. | 0°R |
| D. | none of these |
| Answer» D. none of these | |
| 1855. |
In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.$ |
| A. | 20 |
| B. | 60 |
| C. | 120 |
| D. | ‚àû |
| Answer» E. | |
| 1856. |
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m2 of steel strip. |
| A. | 43743 |
| B. | 1000-1500 |
| C. | 120-500 |
| D. | 1500-3000 |
| Answer» D. 1500-3000 | |
| 1857. |
Ester is formed, when an alcohol reacts with |
| A. | carboxylic acid |
| B. | aldehyde |
| C. | ketone |
| D. | ether |
| Answer» B. aldehyde | |
| 1858. |
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. | |
| 1859. |
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 | |
| 1860. |
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. | |
| 1861. |
If a solid is compressed adiabatically in its elastic range, its __________ remains constat |
| A. | internal energy |
| B. | enthalpy |
| C. | entropy |
| D. | temperature |
| Answer» D. temperature | |
| 1862. |
Hooke's law |
| A. | applies to elastic deformation. |
| B. | applies beyond limit of proportionality in stress-strain curve. |
| C. | states that stress is inversely proportional to strain upto elastic limit. |
| D. | noneofthese. |
| Answer» B. applies beyond limit of proportionality in stress-strain curve. | |
| 1863. |
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. | |
| 1864. |
Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank) |
| A. | H |
| B. | H/2 |
| C. | H/4 |
| D. | H/6 |
| Answer» E. | |
| 1865. |
Runga-Kutta method is used to solve a/an |
| A. | ordinary differential equation of nth order. |
| B. | simultaneous non-linear equation. |
| C. | linear differential equation. |
| D. | none of these. |
| Answer» C. linear differential equation. | |
| 1866. |
Annealing of a material does not |
| A. | permit its further cold working. |
| B. | soften it. |
| C. | case harden it. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1867. |
__________ is not used as a material of construction in thermocouples. |
| A. | Alumel |
| B. | Rhodium |
| C. | Constantan |
| D. | Duralumin |
| Answer» E. | |
| 1868. |
Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position. |
| A. | horizontal |
| B. | vertical |
| C. | inclined |
| D. | any |
| Answer» E. | |
| 1869. |
Ceramic materials are |
| A. | organic in nature. |
| B. | stronger in compression than in tension. |
| C. | always amorphous in nature. |
| D. | always bad heat conductors. |
| Answer» C. always amorphous in nature. | |
| 1870. |
Lead is most readily dissolved in |
| A. | acetic acid |
| B. | hydrochloric acid |
| C. | nitric acid |
| D. | sulphuric acid |
| Answer» B. hydrochloric acid | |
| 1871. |
__________ property of steel increases by addition of large amount of silicon in it. |
| A. | Mechanical |
| B. | Machining |
| C. | Magnetic |
| D. | Refractory |
| Answer» D. Refractory | |
| 1872. |
Energy of the sun arises mainly from __________ reactions. |
| A. | fusion |
| B. | fission |
| C. | combustion |
| D. | none of these |
| Answer» B. fission | |
| 1873. |
Ceramic compounds as compared to metallic compounds |
| A. | crystallise faster. |
| B. | resist greater tensile stress at room temperature. |
| C. | have higher melting temperature. |
| D. | are better conductor of electricity at higher temperature. |
| Answer» D. are better conductor of electricity at higher temperature. | |
| 1874. |
A reduction in thermal resistance during heat transfer does not occur in the |
| A. | convection heat transfer by stirring the fluid and cleaning the heating surface. |
| B. | conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity. |
| C. | radiation heat transfer by increasing the temperature and reducing the emis-sivity. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1875. |
'Cryogenics' is concerned with the generation & use of low temperature in the range of |
| A. | 0°K to 123°K |
| B. | 0°C to - 123°C |
| C. | 0°C to - 273°C |
| D. | 0°K to 273°K |
| Answer» B. 0¬∞C to - 123¬∞C | |
| 1876. |
Heat transfer by radiation from a hot body will be most rapid, if its surface is __________ because of its higher emissivity. |
| A. | white & rough |
| B. | black & rough |
| C. | white & polished |
| D. | black & polished |
| Answer» C. white & polished | |
| 1877. |
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. | |
| 1878. |
Lead pencil contains |
| A. | graphite |
| B. | lead sulphide |
| C. | lead |
| D. | both(b) & (c) |
| Answer» B. lead sulphide | |
| 1879. |
Normalising of a casting does not |
| A. | induce stresses in it. |
| B. | refine its grain structure. |
| C. | reduce seggregation. |
| D. | improve its mechanical properties. |
| Answer» B. refine its grain structure. | |
| 1880. |
Maximum permissible sulphur content in steel is __________ percent. |
| A. | 0.015 |
| B. | 0.055 |
| C. | 0.505 |
| D. | 0.805 |
| Answer» B. 0.055 | |
| 1881. |
Evaporative cooling process employs a combination of cooling and humidification in which the |
| A. | sensible heat is added. |
| B. | sensible heat is removed and the latent heat is added. |
| C. | latent heat is removed. |
| D. | sensible heat is added and latent heat is removed. |
| Answer» C. latent heat is removed. | |
| 1882. |
Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3 . |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 2.5 |
| Answer» E. | |
| 1883. |
Maximum hardenability of steel depends upon its |
| A. | chemical composition |
| B. | carbon content |
| C. | grain size |
| D. | alloying elements content |
| Answer» E. | |
| 1884. |
Inspection of surface and sub-surface cracks in non-magnetic alloys is done by __________ testing method. |
| A. | X-ray |
| B. | magnetic particle |
| C. | dye penetrant |
| D. | ultrasonic |
| Answer» D. ultrasonic | |
| 1885. |
The trace metal present in insulin is |
| A. | Cu |
| B. | Zn |
| C. | Fe |
| D. | Ni |
| Answer» C. Fe | |
| 1886. |
__________ of test specimens is not involved in any hardness testing method. |
| A. | Fracture |
| B. | Indentation |
| C. | Wear |
| D. | Scratch |
| Answer» B. Indentation | |
| 1887. |
The most suitable material of construction for a sewer to carry sewage under high pressure is |
| A. | asbestos cement |
| B. | steel |
| C. | cement concrete |
| D. | stoneware |
| Answer» C. cement concrete | |
| 1888. |
Flywheel is provided in a machine to |
| A. | provide structural strength to the shaft. |
| B. | smoothen the power impluses. |
| C. | help in quick starting of the machine. |
| D. | none of these. |
| Answer» C. help in quick starting of the machine. | |
| 1889. |
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. | |
| 1890. |
A solar cell converts the sunlight directly into __________ energy. |
| A. | thermal |
| B. | electrical |
| C. | mechanical |
| D. | chemical |
| Answer» C. mechanical | |
| 1891. |
Which of the following has the least oili-ness ? |
| A. | Mineral oils |
| B. | Vegetable oils |
| C. | Greases |
| D. | Animal oils |
| Answer» B. Vegetable oils | |
| 1892. |
Pressure exerted by a liquid depends upon its |
| A. | surface tension |
| B. | density |
| C. | viscosity |
| D. | buoyancy |
| Answer» C. viscosity | |
| 1893. |
Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity. |
| A. | 50 |
| B. | 250 |
| C. | 450 |
| D. | 850 |
| Answer» D. 850 | |
| 1894. |
Hoope's cell is predominantly used for the electrolytic refining of |
| A. | zinc |
| B. | copper |
| C. | aluminium |
| D. | tin |
| Answer» D. tin | |
| 1895. |
The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ? |
| A. | Lead |
| B. | Copper |
| C. | Aluminium |
| D. | Wrought iron |
| Answer» B. Copper | |
| 1896. |
The dimensions of Planck's constant is the same as that of the |
| A. | kinetic energy |
| B. | momentum |
| C. | electrostatic potential |
| D. | none of these |
| Answer» E. | |
| 1897. |
Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography. |
| A. | X-rays |
| B. | γ-rays |
| C. | α-rays |
| D. | β-rays |
| Answer» C. Œ±-rays | |
| 1898. |
Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is |
| A. | 38 |
| B. | 26 |
| C. | 16 |
| D. | 4 |
| Answer» E. | |
| 1899. |
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. | |
| 1900. |
For a first order chemical reaction, the concentration of the reactant decreases __________ with time. |
| A. | linearly |
| B. | exponentially |
| C. | logarithmically |
| D. | inversely |
| Answer» B. exponentially | |