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.
| 1801. |
Function of feed check valve in a boiler is to |
| A. | facilitate circulation of high pressure feed water. |
| B. | check the water level in the boiler drum. |
| C. | prevent the back flow of water. |
| D. | regulate the water flow to boiler. |
| Answer» D. regulate the water flow to boiler. | |
| 1802. |
Which of the following is used to produce draught in the locomotive boilers ? |
| A. | Chimney. |
| B. | Induced draught fan. |
| C. | Forced draught fan. |
| D. | Steam jet arrangement. |
| Answer» E. | |
| 1803. |
Which of the following hardness tests does not measure the indentation hardness of metals and alloys ? |
| A. | Vicker's hardness test. |
| B. | Shore sceleroscope test. |
| C. | Brinell hardness test. |
| D. | Rockwell hardness test. |
| Answer» C. Brinell hardness test. | |
| 1804. |
Which of the following is categorised as the plastic welding ? |
| A. | Gas welding |
| B. | Electric arc welding |
| C. | Forge welding |
| D. | None of these |
| Answer» D. None of these | |
| 1805. |
Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 35 |
| Answer» D. 35 | |
| 1806. |
Which of the following does not come under the category of electrochemical corrosion ? |
| A. | Corrosion in organic liquids. |
| B. | Atmospheric corrosion in moist gas or air. |
| C. | Soil corrosion as in the case of underground pipes. |
| D. | Corrosion in sea water and molten metals. |
| Answer» B. Atmospheric corrosion in moist gas or air. | |
| 1807. |
Minimum thermal efficiency of a steam boiler may be around __________ percent |
| A. | 25 |
| B. | 45 |
| C. | 65 |
| D. | 20 |
| Answer» E. | |
| 1808. |
In a good rimming steel |
| A. | carbon and silicon should be low. |
| B. | silicon should be low but carbon should be high. |
| C. | both silicon & carbon should be high. |
| D. | silicon should be high but carbon should be low. |
| Answer» B. silicon should be low but carbon should be high. | |
| 1809. |
The phenomenon of weld decay is found in case of |
| A. | gun metal |
| B. | brass |
| C. | stainless steel |
| D. | cast iron |
| Answer» E. | |
| 1810. |
In a neutral solution |
| A. | H+ ions are absent. |
| B. | OH- ions are absent. |
| C. | both H+ and OH- ions are present in very small but equal concentration. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1811. |
A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place |
| A. | the better insulation material should be put just next to pipe (i.e., inside). |
| B. | the better insulating material should be put outside. |
| C. | either of the insulating material could be put on either side. |
| D. | steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe). |
| Answer» B. the better insulating material should be put outside. | |
| 1812. |
Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium |
| A. | nitrate |
| B. | sulphate |
| C. | carbonate |
| D. | chloride |
| Answer» B. sulphate | |
| 1813. |
Globular form of cementite is formed during the __________ process. |
| A. | spherodising |
| B. | hardening |
| C. | annealing |
| D. | normalising |
| Answer» C. annealing | |
| 1814. |
__________ has the highest melting point out of the following. |
| A. | Tungsten |
| B. | Zirconium |
| C. | Molybdenum |
| D. | Tantalum |
| Answer» B. Zirconium | |
| 1815. |
Welded joint is superior to revetted joint in respect of ease of fabrication, weight and strength. Which of the following joints is the most suitable for pipes carrying fluids under high pressure and temperature ? |
| A. | Flanged joint |
| B. | Expansion joint |
| C. | Bell and spigot joint |
| D. | None of these |
| Answer» C. Bell and spigot joint | |
| 1816. |
Wrought iron does not have the |
| 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. | |
| 1817. |
Out of the following the refractive index is the highest for |
| A. | glass |
| B. | diamond |
| C. | brine |
| D. | kerosene |
| Answer» C. brine | |
| 1818. |
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. | |
| 1819. |
Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron. |
| A. | manganese |
| B. | phosphorous |
| C. | magnesium |
| D. | chromium |
| Answer» D. chromium | |
| 1820. |
Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by |
| A. | conduction |
| B. | convection |
| C. | both 'a' & 'b' |
| D. | radiation |
| Answer» E. | |
| 1821. |
Case hardening of a material is |
| A. | followed by tempering or carburising. |
| B. | preceded by its tempering. |
| C. | done to get a soft ductile interior with a very hard surface. |
| D. | carried out to get extreme hardness in its core. |
| Answer» E. | |
| 1822. |
Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point ? |
| A. | Venturi scrubber |
| B. | Electrostatic precipitator |
| C. | Cyclone separator |
| D. | Fabric filter |
| Answer» C. Cyclone separator | |
| 1823. |
Which of the following if present in iron ore, enhances its value ? |
| A. | Alumina |
| B. | Alkali oxide |
| C. | Lime & Magnesia |
| D. | None of these |
| Answer» D. None of these | |
| 1824. |
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is |
| A. | very low which prevents their ignition by compression. |
| B. | very high which prevents their ignition by compression |
| C. | zero. |
| D. | none of these. |
| Answer» B. very high which prevents their ignition by compression | |
| 1825. |
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 | |
| 1826. |
__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.$ |
| A. | Borosilicate |
| B. | High silica |
| C. | Supermax |
| D. | Lead |
| Answer» D. Lead | |
| 1827. |
Electrode potential is not concerned with the measurment of |
| A. | pH value |
| B. | temperature |
| C. | viscosity |
| D. | density |
| Answer» C. viscosity | |
| 1828. |
The same volume of all gases is representative of their |
| A. | specific gravities. |
| B. | densities. |
| C. | gas characteristic constants. |
| D. | molecular weights. |
| Answer» E. | |
| 1829. |
Lead is added to 60:40 brass primarily to improve |
| A. | machinability |
| B. | corrosion resistance |
| C. | fluidity |
| D. | strength |
| Answer» B. corrosion resistance | |
| 1830. |
The lightest non-inflammable gas is |
| A. | H2 |
| B. | He |
| C. | Ar |
| D. | O2 |
| Answer» C. Ar | |
| 1831. |
Filler metal is not used in the __________ welding. |
| A. | seam |
| B. | electric spot |
| C. | projection |
| D. | all a, b & c |
| Answer» E. | |
| 1832. |
Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint. |
| A. | flanged iron |
| B. | collar |
| C. | flexible |
| D. | expansion |
| Answer» C. flexible | |
| 1833. |
Which of the following is not an ore of aluminium ? |
| A. | Troosite |
| B. | Kaolin |
| C. | Alunite |
| D. | Cryolite |
| Answer» B. Kaolin | |
| 1834. |
Which one is neutral in character ? |
| A. | N2O4 |
| B. | N2O |
| C. | N2O5 |
| D. | N2O3 |
| Answer» C. N2O5 | |
| 1835. |
The substance used as a smoke screen in warfare is |
| A. | C2H2 |
| B. | SiCl4 |
| C. | P2O5 |
| D. | PCl5 |
| Answer» C. P2O5 | |
| 1836. |
In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is$ |
| A. | less |
| B. | more |
| C. | equal |
| D. | unpredictable |
| Answer» B. more | |
| 1837. |
__________ has a negative co-efficient of linear expansion. |
| A. | Iron |
| B. | Copper |
| C. | Rubber |
| D. | Nickel |
| Answer» C. Rubber | |
| 1838. |
Most of the phosphorous present in the blast furnace burden enters into |
| A. | hot metal |
| B. | flue gases |
| C. | slag |
| D. | refractory lining |
| Answer» B. flue gases | |
| 1839. |
Austenite is not |
| A. | ductile |
| B. | malleable |
| C. | magnetic |
| D. | soft |
| Answer» D. soft | |
| 1840. |
'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. | |
| 1841. |
Brittleness induced due to the presence of sulphur in steel can be reduced by adding |
| A. | manganese |
| B. | magnesium |
| C. | vanadium |
| D. | copper |
| Answer» B. magnesium | |
| 1842. |
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 | |
| 1843. |
Colloids can be purified by |
| A. | dialysis |
| B. | reverse osmosis |
| C. | coagulation |
| D. | peptization |
| Answer» B. reverse osmosis | |
| 1844. |
Brazing filler metal used for joining steel plates |
| A. | melts below the melting points of base metals. |
| B. | melts below 300°C. |
| C. | is copper phosphorous alloy. |
| D. | is copper. |
| Answer» B. melts below 300¬∞C. | |
| 1845. |
Streaklines, streamlines & pathlines are almost identical for __________ fluid flow. |
| A. | ideal |
| B. | uniform |
| C. | steady |
| D. | none of these |
| Answer» D. none of these | |
| 1846. |
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. | |
| 1847. |
Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails |
| A. | below the yield point. |
| B. | above the yield point. |
| C. | below the elastic limit. |
| D. | at the elastic limit. |
| Answer» B. above the yield point. | |
| 1848. |
Material of construction of foundary crucible is |
| A. | lead |
| B. | stainless steel |
| C. | graphite |
| D. | cast iron |
| Answer» D. cast iron | |
| 1849. |
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 | |
| 1850. |
Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then |
| A. | it will deliver low discharge of liquid. |
| B. | its efficiency will not be affected. |
| C. | it will not develop sufficient head to raise water. |
| D. | it will be cavitated. |
| Answer» C. it will not develop sufficient head to raise water. | |