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.
| 351. |
Oxyacetylene reducing flame is used while carrying out welding on__________________? |
| A. | Alloy steel |
| B. | Grey cast iron |
| C. | Mild steel |
| D. | High carbon steel |
| Answer» D. High carbon steel | |
| 352. |
Oxyacetylene reducing flame is used while carrying out welding on___________________? |
| A. | Alloy steel |
| B. | Grey cast iron |
| C. | Mild steel |
| D. | High carbon steel |
| Answer» D. High carbon steel | |
| 353. |
Oxide layer formed on the non-ferrous metal surface after its annealing is__________________? |
| A. | Removed by acid pickling |
| B. | Hammered into the surface |
| C. | Removed with coarse emery cloth |
| D. | Left as such to protect the surface |
| Answer» B. Hammered into the surface | |
| 354. |
Out of the following the refractive index is the highest for____________________? |
| A. | Glass |
| B. | Diamond |
| C. | Brine |
| D. | Kerosene |
| Answer» C. Brine | |
| 355. |
Out of the following, the ________________ pipe has the least corrosion resistance? |
| A. | Mild steel |
| B. | Copper |
| C. | Cast iron |
| D. | Wrought iron |
| Answer» E. | |
| 356. |
Out of the following, the lowest packing of atoms exists in ____________________ crystal lattice structure? |
| A. | Hexagonal close, packed (hcp) |
| B. | Face centred cubic (fcc) |
| C. | Body centred cubic (bcc) |
| D. | Simple cubic |
| Answer» E. | |
| 357. |
Out of the following, the most malleable material is________________? |
| A. | Copper |
| B. | Aluminium |
| C. | Wrought iron |
| D. | Lead |
| Answer» E. | |
| 358. |
Out of the following, the joint produced by ______________ has the lowest strength? |
| A. | Soldering |
| B. | Welding |
| C. | Brazing |
| D. | Riveting |
| Answer» B. Welding | |
| 359. |
Out of the following substances, one ton of ______________ will store the maximum heat for a rise of 30°C in temperature ? |
| A. | Steel |
| B. | Lignite |
| C. | Water |
| D. | Lime stone |
| Answer» D. Lime stone | |
| 360. |
Out of the following _______________ iron has the best capability to bear sudden & excessive shocks? |
| A. | White |
| B. | Cast |
| C. | Wrought |
| D. | Pig |
| Answer» D. Pig | |
| 361. |
Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of________________? |
| A. | Steel |
| B. | Glass wood |
| C. | Copper |
| D. | Fireclay bricks |
| Answer» C. Copper | |
| 362. |
Otto cycle used in spark ignition petrol engines is also known as the constant ________________ cycle? |
| A. | Volume |
| B. | Pressure |
| C. | Heat |
| D. | None of these |
| Answer» B. Pressure | |
| 363. |
Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when_________________? |
| A. | Strain rate is increased |
| B. | Grain size is increased |
| C. | Prior cold deformation is increased |
| D. | Not affected by any of the above parameters |
| Answer» B. Grain size is increased | |
| 364. |
Optical activity is a/an _______________________ property ? |
| A. | Additive |
| B. | Constitutive |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 365. |
One ton of refrigeration is not equivalent to the heat removal rate of ____________________? |
| A. | 200 BTU/minute |
| B. | 50 kcal/minute |
| C. | 50 kJ/sec |
| D. | 3.5 KW |
| Answer» D. 3.5 KW | |
| 366. |
One of the methods of purification of leach liquor is ion exchange, which involves_________________? |
| A. | Exchange between two liquid phases |
| B. | Exchange between a gaseous phase and a liquid phase |
| C. | Exchange between a liquid phase and an organic resin phase |
| D. | Exchange between a solid phase and a gas phase |
| Answer» D. Exchange between a solid phase and a gas phase | |
| 367. |
One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W. m-1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is____________________? |
| A. | 100 |
| B. | 900 |
| C. | 9000 |
| D. | 10000 |
| Answer» E. | |
| 368. |
On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the ______________ of the input signal? |
| A. | Frequency |
| B. | Amplitude |
| C. | Damping |
| D. | None of these |
| Answer» B. Amplitude | |
| 369. |
On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________? |
| A. | Creep |
| B. | Toughness |
| C. | Tensile strength |
| D. | Fatigue |
| Answer» C. Tensile strength | |
| 370. |
On being hit with a hammer, ___________________ will readily fracture? |
| A. | Brass |
| B. | Mild steel |
| C. | Cast iron |
| D. | Lead |
| Answer» D. Lead | |
| 371. |
Often earing defects are found during deep drawing operation, because the __________________? |
| A. | Surface finish of the sheet is poor |
| B. | Sheet material has been given substantial spring back |
| C. | Starting sheet has planer anisotropy due to its texture |
| D. | Starting sheet has normal anisotropy due to its texture |
| Answer» D. Starting sheet has normal anisotropy due to its texture | |
| 372. |
____________________ of hard alloy and tool steel is done to make it easily machinable ? |
| A. | Case carburising |
| B. | Tempering |
| C. | Normalising |
| D. | Annealing |
| Answer» C. Normalising | |
| 373. |
_____________________ of grey cast iron produces white cast iron? |
| A. | Tempering |
| B. | Rapid heating |
| C. | Rapid cooling |
| D. | Slow cooling |
| Answer» C. Rapid cooling | |
| 374. |
_____________________ of austenite decreases the hardenability in steel ? |
| A. | Fine grains |
| B. | Coarse grains |
| C. | Homogeneity |
| D. | Dissolved elements (except cobalt) |
| Answer» E. | |
| 375. |
__________________ of air does not increase with increase in temperature? |
| A. | Density |
| B. | Thermal diffusivity |
| C. | Viscosity |
| D. | Thermal conductivity |
| Answer» B. Thermal diffusivity | |
| 376. |
Nusselt number/Biot number varies___________________? |
| A. | Inversely with thermal conductivity |
| B. | Directly with heat transfer co-efficient |
| C. | Directly with thermal conductivity |
| D. | Inversely with the dimension of the solid |
| Answer» B. Directly with heat transfer co-efficient | |
| 377. |
Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as______________________? |
| A. | Re0.5, Re0.8 |
| B. | Re0.8, Re-0.5 |
| C. | Re0.8, Re0.5 |
| D. | Re-0.8, Re0.5 |
| Answer» D. Re-0.8, Re0.5 | |
| 378. |
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________? |
| A. | Gr0.25, Gr |
| B. | Gr0.25, Gr0.33 |
| C. | Gr, Gr0.25 |
| D. | Gr0.33, Gr0.25 |
| Answer» B. Gr0.25, Gr0.33 | |
| 379. |
_______________ number determines whether the fluid flow in an open channel is super-critical, critical or sub-critical ? |
| A. | Mach |
| B. | Reynolds |
| C. | Froude |
| D. | Weber |
| Answer» D. Weber | |
| 380. |
Nuclear fission of one atom of uranium-235 produces the energy equivalent to about ____________ MeV? |
| A. | 20 |
| B. | 200 |
| C. | 500 |
| D. | 2000 |
| Answer» C. 500 | |
| 381. |
Notched bar test is used for testing the _________________ of a material? |
| A. | Impact strength |
| B. | Endurance limit |
| C. | Machinability |
| D. | Corrosion resistance |
| Answer» B. Endurance limit | |
| 382. |
Normalising of an object does not________________________? |
| A. | Refine coarse grain structure obtained during hot working |
| B. | Improve ductility |
| C. | Improve yield strength |
| D. | Improve mechanical properties |
| Answer» C. Improve yield strength | |
| 383. |
Normalising of a casting does not__________________? |
| A. | Induce stresses in it |
| B. | Refine its grain structure |
| C. | Reduce segregation |
| D. | Improve its mechanical properties |
| Answer» B. Refine its grain structure | |
| 384. |
Non-ferrous alloys used for making cutting tools need not have high__________________? |
| A. | Abrasion resistance |
| B. | Toughness |
| C. | Red hardness |
| D. | Cutting speed |
| Answer» C. Red hardness | |
| 385. |
Nitriding of a steel part does not increase its__________________? |
| A. | Grain size |
| B. | Fatigue limit |
| C. | Surface hardness |
| D. | Wear resistance |
| Answer» B. Fatigue limit | |
| 386. |
Nickel is a _________________ material? |
| A. | Ferromagnetic |
| B. | Semi-conductor |
| C. | Paramagnetic |
| D. | Ferroelectric |
| Answer» B. Semi-conductor | |
| 387. |
Nickel and ______________ are the alloying element added in steel to increase its toughness? |
| A. | Molybdenum |
| B. | Chromium |
| C. | Vanadium |
| D. | Silicon |
| Answer» E. | |
| 388. |
Natural water contains approximately ______________ percent of heavy water? |
| A. | 0.015 |
| B. | 0.71 |
| C. | 1.2 |
| D. | 3.5 |
| Answer» B. 0.71 | |
| 389. |
Name the safety device used to protect the boiler, when the water level falls below a minimum level ? |
| A. | Blow down valve |
| B. | Blow off cock |
| C. | Fusible plug |
| D. | Safety valve |
| Answer» D. Safety valve | |
| 390. |
Multistage compression of air as compared to single stage compression offers the advantage of______________? |
| A. | Power saving per unit weight of air delivered |
| B. | Moisture elimination in the inter-stage cooler |
| C. | Increased volumetric efficiency |
| D. | All A , B. & C. |
| Answer» E. | |
| 391. |
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 | |
| 392. |
Most important property of steels for use in automobile bodies is the___________________? |
| A. | Formability |
| B. | Yield strength |
| C. | Toughness |
| D. | Resilience |
| Answer» B. Yield strength | |
| 393. |
More than 95% of _______________ is present in corundum ? |
| A. | SiO2 |
| B. | Al2O3 |
| C. | CaSiO2 |
| D. | MgO |
| Answer» C. CaSiO2 | |
| 394. |
Moist climate is the most favourable factor in the site selection far a_________________? |
| A. | Steel plant |
| B. | Textile factory |
| C. | Petroleum refinery |
| D. | Coke oven battery |
| Answer» C. Petroleum refinery | |
| 395. |
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. | |
| 396. |
Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air? |
| A. | Wet bulb |
| B. | Dry bulb |
| C. | Saturation |
| D. | Dew point |
| Answer» B. Dry bulb | |
| 397. |
Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank) ? |
| A. | H |
| B. | H/2 |
| C. | H/4 |
| D. | H/6 |
| Answer» E. | |
| 398. |
Minimum number of members required to form a Public Limited Joint Stock Com-pany is___________________? |
| A. | 7 |
| B. | 10 |
| C. | 12 |
| D. | 17 |
| Answer» B. 10 | |
| 399. |
Milk is fat dispersed in water. It is an example of__________________? |
| A. | Suspension |
| B. | Emulsion |
| C. | Gel |
| D. | Solution |
| Answer» C. Gel | |
| 400. |
Mild steel has _______________ crystal lattice structure? |
| A. | Face centred cubic (fcc) |
| B. | Body centred cubic (bcc) |
| C. | Orthorhombic |
| D. | Cubic |
| Answer» C. Orthorhombic | |