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.
| 451. |
________________ is the hardest material out of the following ? |
| A. | Boron carbide |
| B. | Tungsten carbide |
| C. | Hardened steel |
| D. | Silicon carbide |
| Answer» B. Tungsten carbide | |
| 452. |
______________ is not used as the control rod material in a nuclear reactor ? |
| A. | Cobalt |
| B. | Hafnium |
| C. | Cadmium |
| D. | Boron |
| Answer» B. Hafnium | |
| 453. |
_________________ is not used as a material of construction in thermocouples ? |
| A. | Alumel |
| B. | Rhodium |
| C. | Constantan |
| D. | Duralumin |
| Answer» E. | |
| 454. |
_________________ is not a heat treatment process ? |
| A. | Cyaniding |
| B. | Parkerizing |
| C. | Austempering |
| D. | Martempering |
| Answer» C. Austempering | |
| 455. |
_______________ is not a case hardening process ? |
| A. | Carburising |
| B. | Nitriding |
| C. | Cyaniding |
| D. | Annealing |
| Answer» B. Nitriding | |
| 456. |
________________ is a special constituent of chlorophyll without which photosynthesis is not possible ? |
| A. | Calcium |
| B. | Nitrogen |
| C. | Phosphorous |
| D. | Hydrogen |
| Answer» C. Phosphorous | |
| 457. |
_______________ 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 | |
| 458. |
______________________ iron is produced by the annealing of white cast iron? |
| A. | Malleable |
| B. | Nodular |
| C. | Ductile |
| D. | Grey |
| Answer» B. Nodular | |
| 459. |
Iron content in Indian iron ore is about _________________ percent? |
| A. | 80-85 |
| B. | 60-65 |
| C. | 40-45 |
| D. | 20-25 |
| Answer» C. 40-45 | |
| 460. |
Internal energy of a gas obeying Van-Der-Waals equation of state, [p + (a/v2)] (V – b) = RT, depends upon its___________________? |
| A. | Pressure & temperature |
| B. | Pressure & specific volume |
| C. | Temperature & specific volume |
| D. | Temperature only |
| Answer» B. Pressure & specific volume | |
| 461. |
Insulation of liquid surface can be achieved by _____________ on top of its surface? |
| A. | Floating hollow polypropylene spheres |
| B. | Spraying alumina powder |
| C. | Putting cement |
| D. | None of these |
| Answer» B. Spraying alumina powder | |
| 462. |
Inertial forces are obtained, when the elastic forces are multiplied by ______________ number? |
| A. | Mach |
| B. | Froude |
| C. | Reynolds |
| D. | Euler |
| Answer» B. Froude | |
| 463. |
Induced draft fans provided in large thermal power plant boilers have __________________ blades? |
| A. | Forward curved |
| B. | Backward curved |
| C. | Double curved |
| D. | Radial or straight |
| Answer» C. Double curved | |
| 464. |
Increasing the carbon content of steel_________________? |
| A. | Reduces the upper shelf energy |
| B. | Increasing the ductility transition temperature |
| C. | Decreases brittleness |
| D. | Decreases hardness |
| Answer» C. Decreases brittleness | |
| 465. |
Increasing sulphur content in pig iron tends to make it ________________? |
| A. | Soft |
| B. | Hard |
| C. | Tough |
| D. | Ductile & malleable |
| Answer» C. Tough | |
| 466. |
Increase in temperature, in general results in the____________________? |
| A. | Decrease in the viscosities of both liquids & gases |
| B. | Increase in the viscosities of both liquids & gases |
| C. | Increase in the viscosity of liquids and decrease in that of gases |
| D. | Decrease in the viscosity of liquids and increase in that of gases |
| Answer» E. | |
| 467. |
Increase in the entropy of a system represents the_____________________? |
| A. | Degradation of energy |
| B. | Decrease in system pressure |
| C. | Increase in the availability of energy |
| D. | Increase in the temperature |
| Answer» B. Decrease in system pressure | |
| 468. |
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 | |
| 469. |
In TIG welding, thoriated tungsten electrodes are used, because it ____________________? |
| A. | Has higher current carrying capacity |
| B. | Has better electron emissivity |
| C. | Is stronger than ordinary tungsten |
| D. | Is easy to prepare |
| Answer» C. Is stronger than ordinary tungsten | |
| 470. |
In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________? |
| A. | Higher, as it gives higher wavelength |
| B. | Lower, as it gives higher wavelength |
| C. | Higher, as it gives shorter wavelength |
| D. | Lower, as it gives shorter wavelength |
| Answer» D. Lower, as it gives shorter wavelength | |
| 471. |
In the diving apparatus, helium is used along with oxygen, because it is ____________________? |
| A. | Easily available |
| B. | Not soluble in blood at high pressure |
| C. | Lighter than nitrogen |
| D. | Completely miscible with oxygen |
| Answer» C. Lighter than nitrogen | |
| 472. |
In the blast furnace, incorporation of water vapour in the blast gives the following effect ? |
| A. | Increases the reducing potential of the gas |
| B. | Increases the flame temperature |
| C. | No significant change occurs |
| D. | Increases the hydrogen content in the metal |
| Answer» B. Increases the flame temperature | |
| 473. |
In the Bayer’s process, bauxite is digested under pressure using ___________________? |
| A. | H2SO4 |
| B. | NaOH |
| C. | NH3 |
| D. | HCl |
| Answer» C. NH3 | |
| 474. |
In the acid Bessemer process, the hot metal should have the following composition ? |
| A. | S < 0.05% and P < 0.05% |
| B. | S < 0.05% and P < 1.5% |
| C. | S 1.5% |
| D. | S > 1.5% and P < 0.05% |
| Answer» B. S < 0.05% and P < 1.5% | |
| 475. |
In ________________ process, there is an increase in entropy with no degradation of energy ? |
| A. | Isothermal expansion |
| B. | Isochoric heat addition |
| C. | Polytropic expansion |
| D. | Isobaric heat addition |
| Answer» B. Isochoric heat addition | |
| 476. |
In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________? |
| A. | 15 to 25 |
| B. | 5 to 10 |
| C. | 40 to 55 |
| D. | 60 to 70 |
| Answer» B. 5 to 10 | |
| 477. |
In Newton’s law of viscosity, which states that the shear stress is proportional to the _____________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ? |
| A. | V2 |
| B. | 1/V2 |
| C. | 1/Vg |
| D. | Vg |
| Answer» E. | |
| 478. |
In multipass welds, shot peening is done after each pass to__________________? |
| A. | Close the surface porosity |
| B. | Break the continuity of columnar grains |
| C. | Flatten the weldment |
| D. | Introduce texture in the weld |
| Answer» B. Break the continuity of columnar grains | |
| 479. |
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 | |
| 480. |
In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________? |
| A. | Jet of water at high pressure |
| B. | Blast of air |
| C. | Mixture of water and air |
| D. | Rain of molten lead |
| Answer» E. | |
| 481. |
In electrical resistance welding, distortion results from the use of improper________________? |
| A. | Clamping methods |
| B. | Electrodes |
| C. | Current |
| D. | Filler material |
| Answer» B. Electrodes | |
| 482. |
In connection with corrosion of metals, passivation is the process that__________________? |
| A. | Intensifies deterioration |
| B. | Changes the composition of the metal |
| C. | Inhibits further deterioration |
| D. | None of these |
| Answer» D. None of these | |
| 483. |
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 | |
| 484. |
In chemical dehumidification of air___________________? |
| A. | Both specific humidity & dry bulb temperature increases |
| B. | Both specific humidity & dry bulb temperature decreases |
| C. | Specific humidity decreases & dry bulb temperature increases |
| D. | Specific humidity increases & dry bulb temperature decreases |
| Answer» D. Specific humidity increases & dry bulb temperature decreases | |
| 485. |
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 | |
| 486. |
In case of simple harmonic motion, displacement is proportional to the_________________? |
| A. | Velocity |
| B. | Acceleration |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. & B. | |
| 487. |
In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is__________________? |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Much more |
| Answer» D. Much more | |
| 488. |
In case of compression of one kg of air, the work done will be the least, when the value of polytropic index ‘n’ is______________________? |
| A. | 1 |
| B. | 1.4 |
| C. | 1.5 |
| D. | Y = Cp/Cv |
| Answer» B. 1.4 | |
| 489. |
In case of brasses, with decreasing zinc percentage and increasing copper percentage, its _____________ increases ? |
| A. | Percentage elongation |
| B. | Brinell hardness |
| C. | Tensile strength |
| D. | All A, B & C |
| Answer» B. Brinell hardness | |
| 490. |
In case of a, centrifugal pump, the ratio h1/h2 is termed as the _____________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller)? |
| A. | Mechanical |
| B. | Overall |
| C. | Volumetric |
| D. | Impeller |
| Answer» B. Overall | |
| 491. |
In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be_______________? |
| A. | ΔQ = 0, ΔS=0 |
| B. | ΔQ = 0, ΔS = +ve |
| C. | ΔQ = 0, ΔS = -ve |
| D. | ΔQ = +ve, ΔS= +ve |
| Answer» C. ΔQ = 0, ΔS = -ve | |
| 492. |
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 | |
| 493. |
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 | |
| 494. |
In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be__________________? |
| A. | Conduction |
| B. | Radiation |
| C. | Natural convection |
| D. | Forced convection |
| Answer» C. Natural convection | |
| 495. |
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________? |
| A. | Range is 15°F |
| B. | Approach is 10°F |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 496. |
In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of_________________? |
| A. | Stainless steel |
| B. | Mild steel |
| C. | High speed steel |
| D. | High carbon steel |
| Answer» D. High carbon steel | |
| 497. |
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. | |
| 498. |
In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will _______________? |
| A. | Decrease gradually |
| B. | Increase gradually |
| C. | Increase rapidly |
| D. | Remain constant |
| Answer» C. Increase rapidly | |
| 499. |
If the head is doubled in & centrifugal pump, the power required will increase in the ratio of__________________? |
| A. | 23 |
| B. | 23/2 |
| C. | 25/2 |
| D. | 21/3 |
| Answer» C. 25/2 | |
| 500. |
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 | |