MCQOPTIONS
Saved Bookmarks
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.
| 901. |
A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm². |
| A. | 6 |
| B. | 18 |
| C. | 38 |
| D. | 52 |
| Answer» C. 38 | |
| 902. |
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 | |
| 903. |
Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C. |
| A. | 80-120 |
| B. | 200-300 |
| C. | 600-800 |
| D. | 1000-1100 |
| Answer» E. | |
| 904. |
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. | |
| 905. |
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10⁻¹6⁶ m² . S⁻¹ and it is 1.94 x 10⁻¹⁴ m² S⁻¹ at 1200 K. The activation energy (in k. J.mole⁻¹ ) for the diffusion of Ni in Cu is |
| A. | 130 |
| B. | 180 |
| C. | 230 |
| D. | 250 |
| Answer» D. 250 | |
| 906. |
Which of the following is not an ore of copper? |
| A. | Cryolite |
| B. | Azurite |
| C. | Chalcopyrite |
| D. | Malachite |
| Answer» B. Azurite | |
| 907. |
Pick out the correct statement |
| A. | Jet engine can work, where there is no atmosphere |
| B. | Rocket engines cannot work, where there is no atmosphere |
| C. | Rocket engines carry oxygen required for the combustion in the form of oxidiser |
| D. | Jet engines also carry oxidiser |
| Answer» D. Jet engines also carry oxidiser | |
| 908. |
Which of the following alloying elements when added in steel does not improve its lachinability? |
| A. | Sulphur |
| B. | Phosphorous |
| C. | Copper |
| D. | Lead |
| Answer» D. Lead | |
| 909. |
Which of the following is prone to cup and cone fracture? |
| A. | Cast iron |
| B. | Soft brass |
| C. | Round specimen of ductile metal |
| D. | Flat tensile specimen of ductile metal |
| Answer» D. Flat tensile specimen of ductile metal | |
| 910. |
Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m² .k), when the insulation thickness is __________ mm. |
| A. | 15 |
| B. | 25 |
| C. | 10 |
| D. | 30 |
| Answer» C. 10 | |
| 911. |
Which of the following alloying elements reduces the formation of iron sulphide in steel? |
| A. | Cobalt |
| B. | Nickel |
| C. | Manganese |
| D. | Vanadium |
| Answer» C. Manganese | |
| 912. |
Pick out the wrong statement |
| A. | Processing of themosetting plastics is ideally done by injection moulding |
| B. | Processing of thermoplastics is ideally done by compression moulding |
| C. | Mass production of seamless pipes are done by electrical resistance welding (ERW) |
| D. | Stretch forming is a process of cold drawing |
| Answer» D. Stretch forming is a process of cold drawing | |
| 913. |
Which of the following is not an explosive? |
| A. | TNT |
| B. | CMC |
| C. | RDX |
| D. | Lead azide |
| Answer» C. RDX | |
| 914. |
Cupola produces __________ iron. |
| A. | Pig |
| B. | Cast |
| C. | Wrought |
| D. | Carbon free |
| Answer» C. Wrought | |
| 915. |
The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C. |
| A. | 768 |
| B. | 908 |
| C. | 1400 |
| D. | 1539 |
| Answer» B. 908 | |
| 916. |
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m² of steel strip. |
| A. | 5-10 |
| B. | 1000-1500 |
| C. | 120-500 |
| D. | 1500-3000 |
| Answer» D. 1500-3000 | |
| 917. |
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 | |
| 918. |
Normalising does not __________ of a metal. |
| A. | Improve machinability & tensile strength |
| B. | Remove internal stresses |
| C. | Refine the structure |
| D. | Remove strains caused by cold working |
| Answer» C. Refine the structure | |
| 919. |
Which of the following mainly decides the current to be employed is arc welding? |
| A. | Electrode size |
| B. | Plate thickness |
| C. | Voltage across the arc |
| D. | Welded portion length |
| Answer» B. Plate thickness | |
| 920. |
The thermodynamic law, PVy = constant, is not followed by the |
| A. | Free expansion of an ideal gas |
| B. | Adiabatic expansion of steam in turbine |
| C. | Adiabatic compression of air |
| D. | Ideal compression of air |
| Answer» B. Adiabatic expansion of steam in turbine | |
| 921. |
Which of the following is not a ferromagnetic material? |
| A. | Nickel |
| B. | Cobalt |
| C. | Aluminium |
| D. | Iron |
| Answer» D. Iron | |
| 922. |
High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent. |
| A. | 5 to 10 |
| B. | 15 to 25 |
| C. | 45 to 50 |
| D. | 75 to 80 |
| Answer» D. 75 to 80 | |
| 923. |
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 | |
| 924. |
Which of the following is not a natural abrasive? |
| A. | Silicon carbide |
| B. | Quartz |
| C. | Corundum |
| D. | Emery |
| Answer» B. Quartz | |
| 925. |
Which of the following accounts for maximum loss of energy in a coal fired boiler? |
| A. | Incomplete combustion of fuel |
| B. | Outgoing flue gases |
| C. | Radiation heat losses |
| D. | Unburnt carbon in ash |
| Answer» C. Radiation heat losses | |
| 926. |
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. | |
| 927. |
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.25 |
| D. | 0.5 |
| Answer» C. 0.25 | |
| 928. |
Which of the following fastening devices has a head at one end and a nut fitted to the other? |
| A. | Bolt |
| B. | Stud |
| C. | Top bolt |
| D. | None of these |
| Answer» C. Top bolt | |
| 929. |
Which of the following is not found in iron-carbon equilibrium diagram? |
| A. | Curie point |
| B. | Peritectic point |
| C. | Eutectic point |
| D. | Eutectoid point |
| Answer» B. Peritectic point | |
| 930. |
The concentration of (H⁺) ions is 4 x 10⁻⁵ in a solution. Then pH of the solution will be (Given log 4 = 0.6 ) |
| A. | 4.4 |
| B. | 5.6 |
| C. | 8.4 |
| D. | 2.4 |
| Answer» B. 5.6 | |
| 931. |
__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C. |
| A. | Vaneering |
| B. | Galvanising |
| C. | Electroplating |
| D. | Calorising |
| Answer» E. | |
| 932. |
On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium⁻²35. |
| A. | 1 |
| B. | 2.5 |
| C. | 3.5 |
| D. | 5 |
| Answer» C. 3.5 | |
| 933. |
Which set of materials is used as a moderator in nuclear reactor? |
| A. | Zircalloy & berrylium |
| B. | Zircalloy & heavy water |
| C. | Zirconium & berrylium |
| D. | Heavy water & berrelium |
| Answer» E. | |
| 934. |
Temperature attained in soldering of metals is about __________ °C. |
| A. | 150-300 |
| B. | 400-500 |
| C. | 650-800 |
| D. | 1000-1100 |
| Answer» B. 400-500 | |
| 935. |
Which of the following polymers is obtained by copolymerisation of three monomers? |
| A. | SAN |
| B. | ABS |
| C. | SBR |
| D. | PTFE |
| Answer» C. SBR | |
| 936. |
What is the percentage of chromium in 18-4-1 high speed steel? |
| A. | 1 |
| B. | 4 |
| C. | 18 |
| D. | 23 |
| Answer» D. 23 | |
| 937. |
Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)? |
| A. | Styrofoam |
| B. | Lucite |
| C. | Perspex |
| D. | Plexiglass |
| Answer» B. Lucite | |
| 938. |
Which of the following materials has the least scrap value? |
| A. | Aluminium |
| B. | Stainless steel |
| C. | Brass |
| D. | Copper |
| Answer» C. Brass | |
| 939. |
Which of the following is not an ore of iron? |
| A. | Chalcopyrite |
| B. | Magnetite |
| C. | Hemetite |
| D. | Limonite |
| Answer» B. Magnetite | |
| 940. |
For the irreversible reaction, Ca+ 2C = Ca C₂ , Δ H°298 = - 60000 J . mole⁻¹ . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be |
| A. | 30000 J |
| B. | 60000 J |
| C. | 90000 J |
| D. | 240000 J |
| Answer» D. 240000 J | |
| 941. |
Which of the following has rotten eggy smell? |
| A. | Hydrogen sulphide |
| B. | Styrene |
| C. | Phenol |
| D. | Dimethyl amine |
| Answer» B. Styrene | |
| 942. |
Minimum number of members required to form a Public Limited Joint Stock Company is |
| A. | 7 |
| B. | 10 |
| C. | 12 |
| D. | 17 |
| Answer» B. 10 | |
| 943. |
In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.) |
| A. | T = 15 - 0.0065 h |
| B. | T = 15 + 0.0065 h |
| C. | T = 0.0035 h - 15 |
| D. | T = 15 - 0.0035 h |
| Answer» B. T = 15 + 0.0065 h | |
| 944. |
Which of the following approaches the ideal gas behaviour most closely? |
| A. | Wet steam |
| B. | Saturated steam |
| C. | Superheated steam |
| D. | Saturated water |
| Answer» D. Saturated water | |
| 945. |
What is the pH of distilled water? |
| A. | 0 |
| B. | 1 |
| C. | 7 |
| D. | 14 |
| Answer» D. 14 | |
| 946. |
Which of the following is the most elastic material? |
| A. | Plastic |
| B. | Glass |
| C. | Steel |
| D. | Rubber |
| Answer» D. Rubber | |
| 947. |
Which of the following pairs is not correctly matched? |
| A. | Uranium - 233 : Fertile material |
| B. | Bindingenergy : Mass defect |
| C. | Scattering : Absorption cross-section |
| D. | Number of nucleons : Mass number |
| Answer» B. Bindingenergy : Mass defect | |
| 948. |
__________ of grey cast iron produces white cast iron. |
| A. | Tempering |
| B. | Rapid heating |
| C. | Rapid cooling |
| D. | Slow cooling |
| Answer» C. Rapid cooling | |
| 949. |
Which of the following is not a dielectric material? |
| A. | Cotton, silk and paper |
| B. | Asbestos, glass, porcelain and mica |
| C. | Rubber and polymeric resins |
| D. | All of the above |
| Answer» D. All of the above | |
| 950. |
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 | |