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.
| 1901. |
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.$ |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 5 | |
| 1902. |
Ammonia leakage in the refrigeration system is detected by |
| A. | sulphur stick, which on detection gives white smoke. |
| B. | using chemical reagents. |
| C. | its smell. |
| D. | soap solution. |
| Answer» B. using chemical reagents. | |
| 1903. |
Carbon supply in pack carburising process is in the form of |
| A. | charcoal |
| B. | calcium carbide |
| C. | hydrocarbon oil |
| D. | graphite |
| Answer» B. calcium carbide | |
| 1904. |
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required. |
| A. | Beryllia |
| B. | Zirconia |
| C. | Alumina |
| D. | Magnesia |
| Answer» D. Magnesia | |
| 1905. |
By X-ray diffraction, it is not possible to determine the |
| A. | preferred orientation. |
| B. | residual localised stresses. |
| C. | particle size. |
| D. | ordered arrangement of magnetic moments. |
| Answer» C. particle size. | |
| 1906. |
In continuous casting process, graphite moulds are used with a view to providing |
| A. | heat resisting medium. |
| B. | self lubricating qualities. |
| C. | non-wetting surfaces. |
| D. | chilling effect. |
| Answer» C. non-wetting surfaces. | |
| 1907. |
For a spontaneous natural process at constant temperature and pressure, the free energy of the system always |
| A. | increases. |
| B. | decreases. |
| C. | remains constant. |
| D. | increases to a maximum before decreasing. |
| Answer» B. decreases. | |
| 1908. |
Floating control action |
| A. | moves the final control element at constant speed in either direction in response to an error signal. |
| B. | changes the position of the final control element from on to off. |
| C. | is used to counteract rapid load changes. |
| D. | none of these. |
| Answer» B. changes the position of the final control element from on to off. | |
| 1909. |
Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay. |
| A. | atoms |
| B. | neutrons |
| C. | nucleons |
| D. | electrons |
| Answer» B. neutrons | |
| 1910. |
The refractory lining of the bottom in a basic electric arc furnace is made of |
| A. | silica |
| B. | alumina |
| C. | magnesia |
| D. | fireclay |
| Answer» D. fireclay | |
| 1911. |
__________ metal is used as a bearing liner material. |
| A. | Pewter |
| B. | White |
| C. | Babbit |
| D. | Gun |
| Answer» D. Gun | |
| 1912. |
Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength. |
| A. | invar |
| B. | hastealloy |
| C. | duralumin |
| D. | monel metal |
| Answer» B. hastealloy | |
| 1913. |
Nitriding of steel is a process for |
| A. | case hardening |
| B. | spheroidising |
| C. | normalising |
| D. | annealing |
| Answer» B. spheroidising | |
| 1914. |
Lubrication is done to control |
| A. | friction |
| B. | wear |
| C. | temperature |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 1915. |
The co-ordination number in simple cubic structure is |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 1916. |
Young's modulus of a material is the measure of its |
| A. | stiffness |
| B. | malleability |
| C. | creep resistance |
| D. | tensile strength |
| Answer» B. malleability | |
| 1917. |
On-off control |
| A. | fully opens the final control element, when the measured variable is below the set point. |
| B. | fully closes the final control element, when the measured variable is above the set point. |
| C. | is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1918. |
If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity |
| A. | is trebled. |
| B. | remains unchanged. |
| C. | decreases by a factor of 3. |
| D. | decreases by a factor of 1/3. |
| Answer» C. decreases by a factor of 3. | |
| 1919. |
First empirical temperature scale conceived is the __________ temperature scale. |
| A. | Absolute |
| B. | Reaumer |
| C. | Farenhite |
| D. | Celcius |
| Answer» D. Celcius | |
| 1920. |
The Al2 O3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent. |
| A. | 43587 |
| B. | 18-20 |
| C. | 42339 |
| D. | 43805 |
| Answer» B. 18-20 | |
| 1921. |
Hot extrusion of aluminium is done in the temperature range of __________ °C.$ |
| A. | 550-600 |
| B. | 450-500 |
| C. | 350-400 |
| D. | 250-300 |
| Answer» D. 250-300 | |
| 1922. |
Multistage compression is necessary for high efficiency, |
| A. | if the ratio of the delivery pressure to the intake pressure exceeds 5:1. |
| B. | when large amount of gas is to be compressed. |
| C. | when the delivered gas is desired at very high velocity. |
| D. | none of these |
| Answer» B. when large amount of gas is to be compressed. | |
| 1923. |
During brazing, if the fluxes are entrapped, it results in the |
| A. | distortion of brazed joints. |
| B. | cracking of joints. |
| C. | presence of gas pockets. |
| D. | corrosion. |
| Answer» E. | |
| 1924. |
Corrosion of metals can not be prevented by its |
| A. | tempering |
| B. | chromising |
| C. | aluminising |
| D. | alloying |
| Answer» B. chromising | |
| 1925. |
__________ iron is produced by the annealing of white cast iron. |
| A. | Malleable |
| B. | Nodular |
| C. | Ductile |
| D. | Grey |
| Answer» B. Nodular | |
| 1926. |
Titanium alloys are welded using the Following process: |
| A. | TIG welding. |
| B. | Submerged arc welding. |
| C. | Butt welding. |
| D. | Electron beam welding. |
| Answer» B. Submerged arc welding. | |
| 1927. |
In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that |
| A. | compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller. |
| B. | maintaining vacuum on tube side is more difficult than that on the shell side. |
| C. | water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam. |
| D. | condenser can act as a storage unit for condensed steam. |
| Answer» D. condenser can act as a storage unit for condensed steam. | |
| 1928. |
The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void. |
| A. | equal to |
| B. | greater than |
| C. | less than |
| D. | either (a), (b) or (c); depends on the size of atom |
| Answer» D. either (a), (b) or (c); depends on the size of atom | |
| 1929. |
__________ 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 | |
| 1930. |
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. | |
| 1931. |
Which of the following forces does not act on a fluid at rest ? |
| A. | Viscous force |
| B. | Gravity force |
| C. | Hydrostatic force |
| D. | Surface tension force |
| Answer» B. Gravity force | |
| 1932. |
The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm. |
| A. | 0.5 |
| B. | 3 |
| C. | 10 |
| D. | 25 |
| Answer» C. 10 | |
| 1933. |
Function of blow down valve in a boiler is to |
| A. | maintain the drum level. |
| B. | keep the drum pressure constant. |
| C. | drain out the sludge from the drum. |
| D. | empty the boiler during shutdown. |
| Answer» D. empty the boiler during shutdown. | |
| 1934. |
Rate of chemical reaction is not much affected, if the reactants are in __________ form. |
| A. | solids |
| B. | liquids |
| C. | either (a) or (b) |
| D. | gaseous |
| Answer» D. gaseous | |
| 1935. |
During solid state sintering of powders, the following mechanism can be active. |
| A. | Evaporation and condensation. |
| B. | Solid state diffusion processes. |
| C. | Liquid formation in grain boundaries. |
| D. | Creation of more dislocations. |
| Answer» C. Liquid formation in grain boundaries. | |
| 1936. |
Powder metallurgy processing can be used for making |
| A. | dispersion strengthened copper rod. |
| B. | self lubricating bearing and cemented carbide. |
| C. | connecting rod. |
| D. | piston. |
| Answer» C. connecting rod. | |
| 1937. |
Fibrous fracture is normally encountered in the __________ materials. |
| A. | hard |
| B. | elastic |
| C. | ductile |
| D. | brittle |
| Answer» D. brittle | |
| 1938. |
Hot working of lead is carried out at |
| A. | 75°C |
| B. | 373°K |
| C. | 150°C |
| D. | room temperature |
| Answer» C. 150¬∞C | |
| 1939. |
Consideration of the creep is the most important in case of the |
| A. | blades of gas turbine. |
| B. | piston of an I. C. engine. |
| C. | flywheel of steam engine. |
| D. | cycle chain. |
| Answer» B. piston of an I. C. engine. | |
| 1940. |
The most important consideration in value engineering is the |
| A. | profit maximisation. |
| B. | customer satisfaction. |
| C. | cost reduction. |
| D. | process improvement. |
| Answer» C. cost reduction. | |
| 1941. |
A good abrasive |
| A. | should be friable. |
| B. | should have low refractoriness. |
| C. | is made up of large size of crystals. |
| D. | should be soft. |
| Answer» B. should have low refractoriness. | |
| 1942. |
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 | |
| 1943. |
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. | |
| 1944. |
The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm. |
| A. | 0.001 |
| B. | 0.01 |
| C. | 0.002 |
| D. | 0.02 |
| Answer» D. 0.02 | |
| 1945. |
The moment of inertia of a body comes into play in __________ motion. |
| A. | curvilinear |
| B. | linear |
| C. | rotational |
| D. | none of these |
| Answer» D. none of these | |
| 1946. |
'Flare tower' used in industry is meant for |
| A. | venting off (after burning) the excess inflammable/toxic gases at high pressure. |
| B. | absorbing the pollutant gases from the furnace exhaust. |
| C. | cooling of furnace exhaust gases. |
| D. | none of these. |
| Answer» B. absorbing the pollutant gases from the furnace exhaust. | |
| 1947. |
Which of the following is not a cupro-nick-el alloy ? |
| A. | German silver |
| B. | Monel metal |
| C. | Muntz metal |
| D. | None of these |
| Answer» D. None of these | |
| 1948. |
Cold chiesel's hammers are made of |
| A. | high speed steel |
| B. | high carbon steel |
| C. | forged steel |
| D. | mild steel |
| Answer» C. forged steel | |
| 1949. |
Existence of velocity potential implies that the fluid is |
| A. | irrotational |
| B. | ideal |
| C. | compressible |
| D. | in continuum |
| Answer» B. ideal | |
| 1950. |
No cutting fluid is normally used, while machining |
| A. | cast iron |
| B. | aluminium |
| C. | mild steel |
| D. | stainless steel |
| Answer» B. aluminium | |