MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4451. |
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the |
| A. | equal sized reactors are the best. |
| B. | smaller reactor should come first. |
| C. | larger reactor should come first. |
| D. | none of these. |
| Answer» C. larger reactor should come first. | |
| 4452. |
Which of the following is the most suitable for handling fibrous and dense slurries ? |
| A. | Propeller agitator |
| B. | Cone type agitator |
| C. | Turbine agitator |
| D. | Radial propeller agitator |
| Answer» C. Turbine agitator | |
| 4453. |
Which of the following constituents of coal is the most important in the production of coke? |
| A. | Moisture |
| B. | Ash |
| C. | Volatiles |
| D. | Carbon |
| Answer» E. | |
| 4454. |
Ratio of primary air to secondary air increases with increase in the rank of coal, because the |
| A. | high rank coals have higher amount of volatile matter. |
| B. | ratio of fixed carbon to volatile matter increases. |
| C. | oxygen content progressively decreases. |
| D. | calorific value of the coal increases. |
| Answer» C. oxygen content progressively decreases. | |
| 4455. |
Spontaneous combustion of coal on storage results due to |
| A. | inadequate ventilation. |
| B. | low temperature oxidation. |
| C. | storage in large heaps with small surface to volume ratio. |
| D. | all (a), (b)and (c). |
| Answer» E. | |
| 4456. |
Supply of excess air for complete combustion of fuel is necessitated to facilitate |
| A. | its thorough mixing with air. |
| B. | attainment of chemical equilibrium. |
| C. | attainment of high temperature. |
| D. | none of these. |
| Answer» B. attainment of chemical equilibrium. | |
| 4457. |
Coke having higher porosity has |
| A. | lower bulk density. |
| B. | lower strength. |
| C. | higher reactivity. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4458. |
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ C. |
| A. | 400-500 |
| B. | 900-1000 |
| C. | 1400-1500 |
| D. | 1700-1800 |
| Answer» C. 1400-1500 | |
| 4459. |
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the |
| A. | industrial chimney exhaust. |
| B. | automobiles exhaust. |
| C. | photochemical reaction in polluted atmosphere. |
| D. | burning of domestic fuel. |
| Answer» C. photochemical reaction in polluted atmosphere. | |
| 4460. |
Inhalation of silica dust by human being causes |
| A. | asphyxiation |
| B. | shortness of breath |
| C. | tuberculosis |
| D. | both(b) & (c) |
| Answer» E. | |
| 4461. |
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels. |
| A. | 105 |
| B. | 135 |
| C. | 160 |
| D. | 185 |
| Answer» C. 160 | |
| 4462. |
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur. |
| A. | 50 |
| B. | 500 |
| C. | 1000 |
| D. | 3000 (i.e. 0.3%) |
| Answer» E. | |
| 4463. |
Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage ? |
| A. | Smog & ozone |
| B. | Hydrogen fluoride & nitrogen oxides |
| C. | Sulphur dioxide & spray of weed killers |
| D. | Carbon monoxide |
| Answer» E. | |
| 4464. |
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called |
| A. | cesspool |
| B. | lagoon |
| C. | skimming mill |
| D. | septic tank |
| Answer» E. | |
| 4465. |
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it. |
| A. | hydrogen |
| B. | carbon dioxide |
| C. | ozone |
| D. | none of these |
| Answer» D. none of these | |
| 4466. |
Insufficient washing of sand grains in a rapid sand filter causes |
| A. | air binding |
| B. | shrinkage of filtering media |
| C. | mud balls |
| D. | expansion of filtering media |
| Answer» D. expansion of filtering media | |
| 4467. |
Which of the following sources is responsible for maximum air pollution ? |
| A. | Industrial chimney exhaust. |
| B. | Forest fire. |
| C. | Automobiles exhaust. |
| D. | Photochemical oxidation of organic matter. |
| Answer» D. Photochemical oxidation of organic matter. | |
| 4468. |
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ? |
| A. | Sedimentation tank |
| B. | Circular clarifier |
| C. | Mechanical flocculation |
| D. | Chemical coagulation |
| Answer» E. | |
| 4469. |
In sewage treatment, its sedimentation is speeded up by commonly adding |
| A. | hydrochloric acid. |
| B. | lime. |
| C. | copper sulphate. |
| D. | sodium sulphate. |
| Answer» C. copper sulphate. | |
| 4470. |
Noise level in a quiet private business office is about __________ decibels. |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 4471. |
Artificial draught produced by a fan can be controlled by the |
| A. | speed of the fan. |
| B. | damper. |
| C. | variation in the pitch of the fan blades. |
| D. | all (a), (b)and(c). |
| Answer» E. | |
| 4472. |
Highly reactive coke have lower |
| A. | porosity. |
| B. | coke reactivity index (CRI). |
| C. | Critical air blast (CAB) value. |
| D. | both (b) and (c). |
| Answer» D. both (b) and (c). | |
| 4473. |
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr. |
| A. | 2.5 |
| B. | 0.5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 0.5 | |
| 4474. |
Cannel coal |
| A. | is non-coking. |
| B. | has a high volatile matter content and burns with a luminous smoky flame. |
| C. | is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4475. |
Ignition temperature decreases progressively from anthracite to lignite, because |
| A. | volatile matter content increases. |
| B. | carbon content decreases. |
| C. | moisture content increases. |
| D. | ash content increases. |
| Answer» B. carbon content decreases. | |
| 4476. |
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____ C. |
| A. | 70 |
| B. | 85 |
| C. | 105 |
| D. | 145 |
| Answer» D. 145 | |
| 4477. |
Which of the following constituents of a fuel does not contribute to its calorific value on combustion ? |
| A. | Hydrogen |
| B. | Sulphur |
| C. | Carbon |
| D. | None of these |
| Answer» E. | |
| 4478. |
C/H ratio is the maximum in case of |
| A. | coal |
| B. | furnace oil |
| C. | natural gas |
| D. | naphtha |
| Answer» B. furnace oil | |
| 4479. |
Calorific value of wood gas is about __________ kcal/Nm3. |
| A. | 1500 |
| B. | 3300 |
| C. | 5400 |
| D. | 8500 |
| Answer» C. 5400 | |
| 4480. |
Fusion point of coal ash increases with increase in its __________ content. |
| A. | iron sulphate |
| B. | iron silicate |
| C. | lime and magnesia |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 4481. |
Washing of coal decreases its |
| A. | caking index. |
| B. | mineral matter content. |
| C. | ash content. |
| D. | both (b) and (c). |
| Answer» C. ash content. | |
| 4482. |
An autothermal reactor is |
| A. | most suitable for a second order reaction. |
| B. | most suitable for a reversible reaction. |
| C. | completely self-supporting in its thermal energy requirements. |
| D. | isothermal in nature. |
| Answer» D. isothermal in nature. | |
| 4483. |
The rate of the chemical reaction A B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction ? |
| A. | 0.5 |
| B. | 1 |
| C. | 0 |
| D. | 2 |
| Answer» C. 0 | |
| 4484. |
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction. |
| A. | non-catalytic homogeneous |
| B. | non-catalytic heterogeneous |
| C. | catalytic homogenous |
| D. | catalytic heterogeneous |
| Answer» D. catalytic heterogeneous | |
| 4485. |
Variables affecting the rate of homogeneous reactions are |
| A. | pressure and temperature only. |
| B. | temperature and composition only. |
| C. | pressure and composition only. |
| D. | pressure, temperature and composition. |
| Answer» E. | |
| 4486. |
Which of the following is used for calcination of limestone and dolomite in industrial practice ? |
| A. | Fluidised bed reactor |
| B. | Moving bed reactor |
| C. | Fixed bed reactor |
| D. | None of these |
| Answer» C. Fixed bed reactor | |
| 4487. |
Slurry reactors are characterised by the |
| A. | lack of intraparticle diffusion resistance. |
| B. | presence of two mobile phases. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4488. |
With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | data in insufficient; can't be predicted |
| Answer» B. decrease | |
| 4489. |
For any reaction, we may write conversion as a function of |
| A. | time |
| B. | temperature |
| C. | concentration |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 4490. |
Radioactive solid nuclear wastes are disposed off by |
| A. | high temperature incineration. |
| B. | pathological incineration. |
| C. | pyrolysis. |
| D. | underground burial in concrete containers. |
| Answer» E. | |
| 4491. |
Growth of __________ is promoted by the presence of manganese in water. |
| A. | files |
| B. | algae |
| C. | micro-organisms |
| D. | mosquitoes |
| Answer» D. mosquitoes | |
| 4492. |
Average human body contains about __________ percent water by weight. |
| A. | 20 |
| B. | 40 |
| C. | 70 |
| D. | 85 |
| Answer» D. 85 | |
| 4493. |
Smog is |
| A. | nothing but black smoke. |
| B. | a combination of smoke and fog. |
| C. | a liquid particle resulting from vapor condensation. |
| D. | a solid particle e.g. flyash. |
| Answer» C. a liquid particle resulting from vapor condensation. | |
| 4494. |
__________ is the process of killing organism in water. |
| A. | Coagulation |
| B. | Sterilisation |
| C. | Disinfection |
| D. | Sedimentation |
| Answer» D. Sedimentation | |
| 4495. |
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas ? |
| A. | Packed scrubber |
| B. | Gravity settling chamber |
| C. | Electrostatic precipitator |
| D. | Hydrocyclone |
| Answer» D. Hydrocyclone | |
| 4496. |
Most of the bacteria in sewage are |
| A. | parasitic |
| B. | saprophytic |
| C. | anerobic |
| D. | none of these |
| Answer» C. anerobic | |
| 4497. |
Reingleman chart No. 2 corresponds to __________ percent black smoke. |
| A. | 10 |
| B. | 20 |
| C. | 40 |
| D. | 80 |
| Answer» D. 80 | |
| 4498. |
Which of the following is a manmade source of air pollution ? |
| A. | Automobile exhaust. |
| B. | Forest fire. |
| C. | Bacterial action in soil and swamp areas |
| D. | All (a), (b) and (c). |
| Answer» B. Forest fire. | |
| 4499. |
Which of the following is the most major constituents of air pollutants ? |
| A. | Oxides of sulphur |
| B. | Oxides of nitrogen |
| C. | Carbon monoxide |
| D. | Hydrogen sulphide |
| Answer» B. Oxides of nitrogen | |
| 4500. |
Which of the following is not an air pollutant ? |
| A. | Ozone |
| B. | Carcinogens |
| C. | Pesticides |
| D. | Metallic powders |
| Answer» B. Carcinogens | |