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.
| 251. |
The lightest non-inflammable gas is_________________? |
| A. | H2 |
| B. | He |
| C. | Ar |
| D. | O2 |
| Answer» C. Ar | |
| 252. |
The life of a ball bearing is inversely proportional to________________? |
| A. | (Load)1 |
| B. | (Load)2 |
| C. | (Load)3 |
| D. | (Load)0.33 |
| Answer» D. (Load)0.33 | |
| 253. |
The leaching solvent used in Baeyer’s process for the purification of bauxite is___________________? |
| A. | Ammonium hydroxide |
| B. | Sodium carbonate |
| C. | Sodium hydroxide |
| D. | Ammonium carbonate |
| Answer» C. Sodium hydroxide | |
| 254. |
The ‘laughing gas’ is__________________? |
| A. | Nitrous oxide |
| B. | Nitric oxide |
| C. | Nitrogen trioxide |
| D. | Nitrogen pentoxide |
| Answer» B. Nitric oxide | |
| 255. |
The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ? |
| A. | x1.5 |
| B. | x0.8 |
| C. | x-1.5 |
| D. | x-0.8 |
| Answer» C. x-1.5 | |
| 256. |
The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for ______________ at room temperature ? |
| A. | Air |
| B. | Water |
| C. | Mercury |
| D. | Alcohol |
| Answer» C. Mercury | |
| 257. |
The highest stress that a material can withstand for a specified length of time without excessive deformation is called the ____________ strength ? |
| A. | Creep |
| B. | Endurance |
| C. | Fatigue |
| D. | None of these |
| Answer» B. Endurance | |
| 258. |
The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is___________________? |
| A. | Full annealing |
| B. | Bright annealing |
| C. | Patenting |
| D. | None of these |
| Answer» D. None of these | |
| 259. |
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ? |
| A. | 2300 J |
| B. | 4600 J |
| C. | 230 J |
| D. | 2.3 × 106 J |
| Answer» B. 4600 J | |
| 260. |
The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _____________________? |
| A. | Base and strong acid |
| B. | Base and weak acid |
| C. | Acid and weak base |
| D. | None of these |
| Answer» B. Base and weak acid | |
| 261. |
The hardenability of steel decreases with__________________? |
| A. | Decrease in dislocation density |
| B. | Increase in solutionising temperature |
| C. | Increase in strength |
| D. | Decrease in grain size |
| Answer» E. | |
| 262. |
The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the _____________ of the slag ? |
| A. | Fluidity |
| B. | Basicity |
| C. | Acidity |
| D. | Viscosity |
| Answer» B. Basicity | |
| 263. |
The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be________________? |
| A. | 3171Pa |
| B. | 3567Pa |
| C. | 1.01 × 105Pa |
| D. | 5000Pa |
| Answer» C. 1.01 × 105Pa | |
| 264. |
The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the_________________? |
| A. | Pipe roughness & pipe diameter |
| B. | Fluid velocity |
| C. | Type of flowing fluid |
| D. | Both B. & C. |
| Answer» E. | |
| 265. |
The following type of bonding is strongly directional in solids ? |
| A. | Vander Waal’s |
| B. | Ionic |
| C. | Metallic |
| D. | Covalent |
| Answer» E. | |
| 266. |
The following thermocouple may be used for measuring temperature upto 1873°K__________________? |
| A. | Chromel-alumel |
| B. | Copper-constantan |
| C. | Platinum-platinum rhodium |
| D. | Iron-constantan |
| Answer» D. Iron-constantan | |
| 267. |
The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ? |
| A. | Two |
| B. | Four |
| C. | Six |
| D. | Eight |
| Answer» B. Four | |
| 268. |
______________ the exhaust gas is an indication of the incomplete combustion of fuel? |
| A. | Low temperature of |
| B. | High temperature of |
| C. | High % of CO in |
| D. | High % of CO2 in |
| Answer» D. High % of CO2 in | |
| 269. |
The excess air required for the combustion of pulverized coal is of the order of about _______________ percent ? |
| A. | 5 |
| B. | 15 |
| C. | 30 |
| D. | 45 |
| Answer» C. 30 | |
| 270. |
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. | |
| 271. |
The elastic strain in copper is due to the__________________? |
| A. | Motion of dislocations |
| B. | Stretching of atomic bonds |
| C. | Breakage of atomic bonds |
| D. | None of the above |
| Answer» B. Stretching of atomic bonds | |
| 272. |
The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by_________________? |
| A. | T1/(T1-T2) |
| B. | T2/(T1-T2) |
| C. | T1/T2 |
| D. | T2/T1 |
| Answer» C. T1/T2 | |
| 273. |
The effect of friction on the flow of steam through a nozzle is to decrease the _______________ of steam? |
| A. | Wetness |
| B. | Mass flow rate |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 274. |
The dimensional formula of bulk modulus of elasticity is same as that of the ____________________? |
| A. | Pressure |
| B. | Density |
| C. | Force |
| D. | None of these |
| Answer» B. Density | |
| 275. |
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 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 | |
| 276. |
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 | |
| 277. |
The difference between gross & net calorific values of fuel is due to the___________________? |
| A. | Sensible heat carried away by the flue gases |
| B. | Heat carried away by the steam from the moisture content of the fuel |
| C. | Heat lost by radiation |
| D. | Heat carried away by steam from the combustion of hydrogen in the fuel |
| Answer» E. | |
| 278. |
The delivery pressure of boiler feed water pump compared to the boiler steam pressure is___________________? |
| A. | Same |
| B. | Slightly less |
| C. | Slightly more |
| D. | Much more |
| Answer» D. Much more | |
| 279. |
The critical pressure at which the latent heat of vaporization of steam becomes zero is _____________ Kg/cm2 ? |
| A. | 273.15 |
| B. | 225.65 |
| C. | 100.03 |
| D. | 373.15 |
| Answer» C. 100.03 | |
| 280. |
The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is ______________ BTU/hr? |
| A. | 100 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |
| 281. |
The condition of diffraction from a crystal is given by______________? |
| A. | nλ = 2d Sin θ |
| B. | λ = d Sin 2θ |
| C. | λ = 2d Sin 2θ |
| D. | nλ = d Sin θ |
| Answer» B. λ = d Sin 2θ | |
| 282. |
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 | |
| 283. |
The co-ordination number in simple cubic structure is___________________? |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 284. |
The cathode in an electrochemical cell always carries____________________? |
| A. | Negative charge |
| B. | Positive charge |
| C. | Zero charge |
| D. | Positive or negative charge depending upon the nature of the cell |
| Answer» B. Positive charge | |
| 285. |
The burnout heat flux in the nucleate boiling regime is not a function of the_________________? |
| A. | Liquid density |
| B. | Vapour density |
| C. | Temperature difference |
| D. | Heat of evaporation |
| Answer» C. Temperature difference | |
| 286. |
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. | |
| 287. |
The best lubricants for a machine working at high temperature & load is_________________? |
| A. | Grease |
| B. | Solid lubricant |
| C. | Animal oils |
| D. | Mineral oils |
| Answer» C. Animal oils | |
| 288. |
The best guide to judge the general quality of water is the measurement of its__________________? |
| A. | pH value |
| B. | Electrical conductivity |
| C. | Turbidity |
| D. | Dissolved oxygen content |
| Answer» C. Turbidity | |
| 289. |
The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the_______________? |
| A. | Work hardening |
| B. | Bauschinger effect |
| C. | Creeping effect |
| D. | Stress recovery effect |
| Answer» C. Creeping effect | |
| 290. |
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 | |
| 291. |
The atmospheric temperature during melting of ice/snow (in the atmosphere)_________________? |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | May increase or decrease; depends on the altitude where snow melts |
| Answer» B. Increases | |
| 292. |
The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ? |
| A. | 25 |
| B. | 35 |
| C. | 55 |
| D. | 75 |
| Answer» D. 75 | |
| 293. |
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the ______________ of a boiler ? |
| A. | Evaporative capacity |
| B. | Evaporation efficiency |
| C. | Thermal efficiency |
| D. | Steam load |
| Answer» B. Evaporation efficiency | |
| 294. |
The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their__________________? |
| A. | Equivalent weight |
| B. | (Equivalent weight)2 |
| C. | Molecular weight |
| D. | (Molecular weight)2 |
| Answer» B. (Equivalent weight)2 | |
| 295. |
The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ? |
| A. | 2-5 |
| B. | 18-20 |
| C. | 12-15 |
| D. | 6-12 |
| Answer» B. 18-20 | |
| 296. |
The activity of pure hydrogen gas at 1000°C and 5 atm pressure_________________? |
| A. | Is always less than 1 |
| B. | Is always greater than 1 |
| C. | Can be 5 |
| D. | Depends on the choice of the standard state |
| Answer» E. | |
| 297. |
The activity co-efficient of the solute in a dilute solution ? |
| A. | Decreases with the increase of concentration of the solute |
| B. | Increases with the increase of concentration of the solute |
| C. | Remains constant |
| D. | Is unity at infinite dilution |
| Answer» D. Is unity at infinite dilution | |
| 298. |
Screws are specified by their _____________ diameters? |
| A. | Minor |
| B. | Major |
| C. | Pitch |
| D. | None of these |
| Answer» C. Pitch | |
| 299. |
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 | |
| 300. |
Satellite is a _________________ material? |
| A. | Ferrous |
| B. | Ceramic |
| C. | Cemented carbide |
| D. | Non-ferrous cast alloy cutting tool |
| Answer» E. | |