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.
| 951. |
Which of the following is an ore dressing operation? |
| A. | Classification |
| B. | Smelting |
| C. | Roasting |
| D. | None of these |
| Answer» B. Smelting | |
| 952. |
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 | |
| 953. |
Which of the following is resistant to the action of both heat & chemicals? |
| A. | Boro silicate glass |
| B. | Silica glass |
| C. | Soda lime glass |
| D. | None of these |
| Answer» B. Silica glass | |
| 954. |
Shock resisting steels should possess high |
| A. | Hardness |
| B. | Toughness |
| C. | Tensile strength |
| D. | Wear resistance |
| Answer» D. Wear resistance | |
| 955. |
While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C. |
| A. | 1800 |
| B. | 2000 |
| C. | 2400 |
| D. | 3000 |
| Answer» C. 2400 | |
| 956. |
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. | ∞ |
| Answer» E. | |
| 957. |
Which of the following metals occurs in nature in their free metallic state? |
| A. | Au & Ag |
| B. | Pb & Zn |
| C. | Cu & Ni |
| D. | None of these |
| Answer» E. | |
| 958. |
Which of the following has the least value of ultimate tensile strength (UTS)? |
| A. | Medium carbon steel |
| B. | High carbon steel |
| C. | Cast iron |
| D. | Wrought iron |
| Answer» C. Cast iron | |
| 959. |
The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D. |
| A. | 140 |
| B. | 180 |
| C. | 240 |
| D. | 280 |
| Answer» E. | |
| 960. |
Pick out the correct statement. |
| A. | Materials exhibiting high elasticity obey Hooke's law |
| B. | The elastic behaviour of rubber under compression is the same as its behaviour under tension |
| C. | The damping capacity of a material is due to its plastic deformation |
| D. | The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations |
| Answer» C. The damping capacity of a material is due to its plastic deformation | |
| 961. |
Which of the following has the highest modulus of elasticity (about 7 x 10⁶ kg/cm²) ? |
| A. | High speed steel |
| B. | Stainless steel |
| C. | Tungsten carbide |
| D. | Superalloys |
| Answer» D. Superalloys | |
| 962. |
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 | |
| 963. |
__________ is a special constituent of chlorophyll without which photosynthesis is not possible. |
| A. | Calcium |
| B. | Nitrogen |
| C. | Phosphorous |
| D. | Hydrogen |
| Answer» C. Phosphorous | |
| 964. |
Broaching tools are usually made of |
| A. | Cermets |
| B. | High speed steel |
| C. | Tungsten carbide |
| D. | Stellite |
| Answer» C. Tungsten carbide | |
| 965. |
Which of the following materials does not form adherent oxide film on surface? |
| A. | Copper |
| B. | Nickel |
| C. | Aluminium |
| D. | Gold & silver |
| Answer» E. | |
| 966. |
Dies for wire drawing are generally made of |
| A. | Mild steel |
| B. | Stainless steel |
| C. | Carbides |
| D. | High carbon steel |
| Answer» B. Stainless steel | |
| 967. |
Which of the following is not categorised as the ore agglomeration process? |
| A. | Nodulising |
| B. | Pelletising |
| C. | Balling |
| D. | Briquetting |
| Answer» D. Briquetting | |
| 968. |
Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10⁻² atm, the partial pressure of B is 10⁻³ atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is |
| A. | 10 atmv |
| B. | 10⁵ atm⁻¹ |
| C. | 10 (dimensionless) |
| D. | 10⁵ (dimensionless) |
| Answer» C. 10 (dimensionless) | |
| 969. |
Sheardising process is used for |
| A. | Surface coating |
| B. | Heat treatment of high speed steel |
| C. | Cold working on metals |
| D. | None of these |
| Answer» B. Heat treatment of high speed steel | |
| 970. |
Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs. |
| A. | Enthalpy |
| B. | Relative humidity |
| C. | Wet bulb temperature |
| D. | Dew point temperature |
| Answer» E. | |
| 971. |
Which of the following is the most suitable abrasive for grinding high tensile strength materials? |
| A. | Silicon carbide |
| B. | Corundum |
| C. | Aluminium oxide |
| D. | Boron carbide |
| Answer» D. Boron carbide | |
| 972. |
What happens, when SO₂ is passed through a solution of H₂S in water? |
| A. | Precipitation of sulphur takes place |
| B. | H₂SO₃ is formed |
| C. | Oleum is formed |
| D. | None of these |
| Answer» B. H₂SO₃ is formed | |
| 973. |
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO₂ = 12%, O₂ = 8%, CO = nil, N₂ = 80%. This flue gas composition indicates that |
| A. | Pure oxygen has been used for combustion |
| B. | Nitrogen percentage in the fuel is very high |
| C. | Excess air has been used for combustion |
| D. | Hydrogen is not present in the fuel |
| Answer» D. Hydrogen is not present in the fuel | |
| 974. |
Which of the following is not an ore of aluminium? |
| A. | Troosite |
| B. | Kaolin |
| C. | Alunite |
| D. | Cryolite |
| Answer» B. Kaolin | |
| 975. |
Which of the following gases cause global warming? |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Nitrogen |
| D. | Ozone |
| Answer» C. Nitrogen | |
| 976. |
Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is |
| A. | 3 |
| B. | 5 |
| C. | 0.5 |
| D. | 1.5 |
| Answer» C. 0.5 | |
| 977. |
A thin, flat & square plate measuring 2 m x 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m ². The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m² °C. |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 978. |
Softening of hardned steel is done by its |
| A. | Normalising |
| B. | Tempering |
| C. | Annealing |
| D. | Carburising |
| Answer» B. Tempering | |
| 979. |
Encyclopaedia of Chemical Technology has been |
| A. | Authored by Kirk Othmer |
| B. | Edited by Perry and Chilton |
| C. | Edited by Kirk Othmer |
| D. | Authored by Perry and Chilton |
| Answer» D. Authored by Perry and Chilton | |
| 980. |
Heat required to raise the temperature of a body by 1 °C is called its |
| A. | Heat capacity |
| B. | Specific heat capacity |
| C. | Thermal conductivity |
| D. | Water equivalent |
| Answer» B. Specific heat capacity | |
| 981. |
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by |
| A. | Decreasing the surface area of the electrodes |
| B. | Increasing the concentration of zinc sulphate solution |
| C. | Increasing the surface area of the electrodes |
| D. | Increasing the concentration of copper sulphate solution |
| Answer» E. | |
| 982. |
The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/ cm². |
| A. | 273.15 |
| B. | 225.65 |
| C. | 100.03 |
| D. | 373.15 |
| Answer» C. 100.03 | |
| 983. |
The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be |
| A. | 0.8 |
| B. | 1 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 984. |
Window panes of aeroplanes are normally made of |
| A. | Perspex (PMMA) |
| B. | Teflon (PTFE) |
| C. | Bakelite (phenol formaldehyde) |
| D. | Polystyrene |
| Answer» B. Teflon (PTFE) | |
| 985. |
Saturated steam at a pressure of 25 kg/cm² is throttled to attain 5 kg/cm² . Then the outcoming steam will be |
| A. | Wet |
| B. | Saturated |
| C. | Superheated |
| D. | None of these |
| Answer» D. None of these | |
| 986. |
Main constituent of bone ash is |
| A. | ammonium phosphate. |
| B. | calcium phosphate. |
| C. | animal charcoal. |
| D. | ammonium sulphate. |
| Answer» C. animal charcoal. | |
| 987. |
The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding. |
| A. | runner |
| B. | cylinder |
| C. | mold |
| D. | none of these |
| Answer» B. cylinder | |
| 988. |
Which of the following is not used as an alloying element in steel used for making permanent magnetic material ? |
| A. | Tungsten |
| B. | Chromium |
| C. | Vanadium |
| D. | Cobalt |
| Answer» D. Cobalt | |
| 989. |
Ingrannular corrosion occurs __________ stainless steel. |
| A. | in all types of steels except |
| B. | at the surface of |
| C. | along grain boundaries of |
| D. | in the core of |
| Answer» D. in the core of | |
| 990. |
The type of pump used for lifting large quantity of sewage is a __________ pump. |
| A. | gear |
| B. | centrifugal |
| C. | reciprocating |
| D. | plunger |
| Answer» C. reciprocating | |
| 991. |
Filler material used in welding should have __________ as compared to the parent metal to be welded. |
| A. | lower melting temperature |
| B. | same melting temperature |
| C. | same composition |
| D. | both 'b' & 'c' |
| Answer» E. | |
| 992. |
Stellite is a __________ material. |
| A. | ferrous |
| B. | ceramic |
| C. | cemented carbide |
| D. | non ferrous cast alloy cutting tool |
| Answer» E. | |
| 993. |
Electrochemical corrosion occurs |
| A. | where the liquid electrolytes containing free ions are present. |
| B. | only in alloys. |
| C. | only in pure metals. |
| D. | due to direct chemical action of metal with oxygen. |
| Answer» B. only in alloys. | |
| 994. |
Which of the following polymers is obtained by copolymerisation of three monomers ? |
| A. | SAN |
| B. | ABS |
| C. | SBR |
| D. | PTFE |
| Answer» C. SBR | |
| 995. |
The process of removal of scale formed during hot rolling of steel is termed as |
| A. | descaling |
| B. | shot blasting |
| C. | pickling |
| D. | skimming |
| Answer» D. skimming | |
| 996. |
Out of the following, the materials having maximum magnetic permeability is |
| A. | silicon steel (Si = 4%) |
| B. | cast iron |
| C. | wrought iron |
| D. | mild steel |
| Answer» B. cast iron | |
| 997. |
The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the |
| A. | critical point. |
| B. | curie temperature. |
| C. | inversion temperature. |
| D. | eutectic temperature. |
| Answer» C. inversion temperature. | |
| 998. |
Which of the following materials has the maximum shrinkage allowance ? |
| A. | Brass |
| B. | Cast iron |
| C. | Lead |
| D. | Aluminium alloy |
| Answer» D. Aluminium alloy | |
| 999. |
Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal |
| A. | tensile strength. |
| B. | compressive strength. |
| C. | Young's modulus. |
| D. | thermal co-efficient of expansion. |
| Answer» E. | |
| 1000. |
Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ? |
| A. | Vapour locking. |
| B. | Hot starting. |
| C. | Spark plug fouling. |
| D. | all 'a', 'b' & 'c'. |
| Answer» D. all 'a', 'b' & 'c'. | |