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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.
| 4601. |
Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes. |
| A. | 18 |
| B. | 24 |
| C. | 6 |
| D. | 12 |
| Answer» C. 6 | |
| 4602. |
The dispersion number of perfect mixed flow is |
| A. | 0 |
| B. | > 150 |
| C. | |
| D. | < 2100 |
| Answer» D. < 2100 | |
| 4603. |
For the reaction , the rate of formation of Z is 0.2 gm mole/litre.hr. what is the rate of disappearance of X in gm mole/litre. hr ? |
| A. | 0.4 |
| B. | 0.1 |
| C. | 0.2 |
| D. | none ofthese |
| Answer» B. 0.1 | |
| 4604. |
An irreversible aqueous phase reaction, A + B P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed?Data: Heat of reaction = - 50 kJ/moleDensity of the reacting mixture = 1000kg/m3Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition. |
| A. | 190 |
| B. | 290 |
| C. | 390 |
| D. | 490 |
| Answer» C. 390 | |
| 4605. |
The reactions with low activation energy are |
| A. | always spantaneous |
| B. | slow |
| C. | fast |
| D. | non-spontaneous |
| Answer» D. non-spontaneous | |
| 4606. |
Molecularity of an elementary reaction, P + Q R + S is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 4607. |
Which of the following is not endothermic in nature ? |
| A. | Combustion of sulphur. |
| B. | Gasification of carbon. |
| C. | Thermal cracking of fuel oil. |
| D. | Steam reforming of naphtha. |
| Answer» B. Gasification of carbon. | |
| 4608. |
The space time is equivalent to the holding time in a steady state mixed reactor for |
| A. | non-isothermal gas reaction. |
| B. | variable fluid density systems. |
| C. | constant fluid density systems. |
| D. | gas reactions with changing no. of moles. |
| Answer» D. gas reactions with changing no. of moles. | |
| 4609. |
The first order gas phase reaction is conducted isothermally in batch mode. The rate of change of conversion with time is given by |
| A. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-470-2.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-470-3.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-470-4.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-470-5.png"> |
| Answer» D. <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-470-5.png"> | |
| 4610. |
Promoter is added to the catalyst to improve its |
| A. | porosity |
| B. | sensitivity |
| C. | surface area |
| D. | none of these |
| Answer» C. surface area | |
| 4611. |
An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will |
| A. | be more in CSTR than in PFR. |
| B. | be more in PFR than in CSTR. |
| C. | be same in both cases. |
| D. | depend on the temperature. |
| Answer» C. be same in both cases. | |
| 4612. |
When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn. |
| A. | packed |
| B. | spray |
| C. | tray |
| D. | bubble |
| Answer» E. | |
| 4613. |
In an exothermic reaction, the energy of the reacting substances as compared to that of products is |
| A. | more |
| B. | less |
| C. | same |
| D. | either (a) or (b), depends on order of reaction. |
| Answer» B. less | |
| 4614. |
For a tubular flow reactor with uniform concentration and temperature, the independent variable is |
| A. | time |
| B. | length |
| C. | diameter |
| D. | none of these |
| Answer» C. diameter | |
| 4615. |
In case of calcination of limestone, CaCO3 CaO + CO2, the addition of more of CaO will result in __________ in the concentration of CO2. |
| A. | no change |
| B. | increase |
| C. | decrease |
| D. | unpredictable from the data |
| Answer» B. increase | |
| 4616. |
The rate of a homogeneous reaction is a function of |
| A. | temperature and pressure only. |
| B. | temperature and composition only. |
| C. | pressure and composition only. |
| D. | all temperature, pressure and composition. |
| Answer» E. | |
| 4617. |
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the |
| A. | catalytic conversion |
| B. | green house effect |
| C. | global warming |
| D. | both (b) and (c) |
| Answer» E. | |
| 4618. |
The resistance of water to the passage of light through it is a measure of the |
| A. | turbidity |
| B. | color |
| C. | hardness |
| D. | dissolved gases |
| Answer» B. color | |
| 4619. |
Color test of water is done with an instrument called |
| A. | tintometer |
| B. | colorimeter |
| C. | electro-chemical cell |
| D. | turbidimeter |
| Answer» B. colorimeter | |
| 4620. |
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas ? |
| A. | Hydrogen |
| B. | Acetylene |
| C. | Carbon monoxide |
| D. | Ammonia |
| Answer» C. Carbon monoxide | |
| 4621. |
Which of the following is the most widely used disinfectant in water treatment ? |
| A. | Chlorine |
| B. | Irradiation of water by ultraviolet light |
| C. | Cation exchanger |
| D. | Coagulation |
| Answer» B. Irradiation of water by ultraviolet light | |
| 4622. |
Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by |
| A. | quenching of hot coke. |
| B. | discharging in the river stream. |
| C. | filtration and recycling for cooling coke oven gas. |
| D. | none of these. |
| Answer» B. discharging in the river stream. | |
| 4623. |
5-200 m size particles are called |
| A. | colloids or aerosols |
| B. | powder |
| C. | dust |
| D. | smoke |
| Answer» B. powder | |
| 4624. |
Which of the following is not a source of ozone emission in the atmosphere ? |
| A. | Refrigerators. |
| B. | Xerox machines. |
| C. | Dermatological photo-therapy equipments. |
| D. | High voltage electrical equipments. |
| Answer» B. Xerox machines. | |
| 4625. |
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the |
| A. | forestation |
| B. | rain |
| C. | green house effect |
| D. | vegetation |
| Answer» D. vegetation | |
| 4626. |
The upper layer of atmosphere is called the |
| A. | stratosphere |
| B. | troposphere |
| C. | ionosphere |
| D. | none of these |
| Answer» B. troposphere | |
| 4627. |
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels. |
| A. | 60 |
| B. | 90 |
| C. | 105 |
| D. | 120 |
| Answer» C. 105 | |
| 4628. |
The most commonly used chemical coagulant in water treatment is |
| A. | ferrous sulphate |
| B. | alum |
| C. | lime |
| D. | hydrazine |
| Answer» C. lime | |
| 4629. |
The biological decomposition of organic substances in wastes controlled conditions is called |
| A. | incineration |
| B. | biological oxidation |
| C. | composting |
| D. | none of these |
| Answer» D. none of these | |
| 4630. |
Higher concentration of nitrogen dioxide in atmospheric air causes |
| A. | cancer |
| B. | bronchitis |
| C. | asphyxiation |
| D. | corrosion |
| Answer» C. asphyxiation | |
| 4631. |
Ozone is |
| A. | a primary pollutant. |
| B. | a secondary pollutant. |
| C. | impervious to ultra-violet rays. |
| D. | both (b) and (c) |
| Answer» E. | |
| 4632. |
The permissible color for domestic water supply is __________ ppm. |
| A. | 1 |
| B. | 20 |
| C. | 100 |
| D. | 1000 |
| Answer» C. 100 | |
| 4633. |
High noise levels produced during operation of fans and compressors can be reduced by using |
| A. | mufflers (silencers). |
| B. | accoustical absorbent. |
| C. | lagging of noisy duct. |
| D. | none of these. |
| Answer» B. accoustical absorbent. | |
| 4634. |
The Killer gas which caused Bhopal gas tragedy in 1984 was |
| A. | phosgene |
| B. | methyl iso-cynate (MIC) |
| C. | carbon monoxide |
| D. | sulphur dioxide |
| Answer» C. carbon monoxide | |
| 4635. |
Global warming may result in |
| A. | flood |
| B. | cyclone |
| C. | decrease in food productivity |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 4636. |
Which of the following is the most lethal water pollutant ? |
| A. | Phenol and cynide |
| B. | Chlorine |
| C. | Alkalis |
| D. | Suspended solids |
| Answer» B. Chlorine | |
| 4637. |
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) |
| A. | acts as a green house gas thereby raising earth's temperature. |
| B. | causes asphyxia. |
| C. | causes increase in sea level. |
| D. | inhances the green house effect. |
| Answer» C. causes increase in sea level. | |
| 4638. |
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms. |
| A. | 10 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |
| 4639. |
Which of the following is an adsorbant used for the removal of SO2 from gas/air ? |
| A. | Bog iron |
| B. | Limestone powder or alkalised alumina |
| C. | Silica gel |
| D. | Active carbon |
| Answer» C. Silica gel | |
| 4640. |
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is |
| A. | neutralised by alkali treatment. |
| B. | left as such without any treatment. |
| C. | diluted with fresh water to reduce its acidity. |
| D. | none of these. |
| Answer» B. left as such without any treatment. | |
| 4641. |
Green house effect is accentuated by |
| A. | deforestation. |
| B. | rapid industrialisation. |
| C. | increased transportation activity. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4642. |
Thermal pollution due to excessive heat & temperature in the working place causes |
| A. | reduction in working efficiency of manpower. |
| B. | fatigue. |
| C. | high breathing rate. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 4643. |
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes |
| A. | cancer |
| B. | silicosis |
| C. | respiratory disease (e.g., asthma) |
| D. | reduced crop yield |
| Answer» B. silicosis | |
| 4644. |
World environment day is observed every year on the 5th of |
| A. | June |
| B. | December |
| C. | July |
| D. | September |
| Answer» B. December | |
| 4645. |
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is |
| A. | pipe vibrations. |
| B. | cavitation. |
| C. | boundary layer separation. |
| D. | fluctuation in liquid flow. |
| Answer» C. boundary layer separation. | |
| 4646. |
Presence of dissolved impurities of __________ is responsible for the red brownish color of water. |
| A. | carbonates |
| B. | bi-carbonates |
| C. | iron & manganese |
| D. | arsenic |
| Answer» D. arsenic | |
| 4647. |
TLV of aldrin in public water supply system is about __________ g/litre. |
| A. | 0.5 |
| B. | 17 |
| C. | 357 |
| D. | 1097 |
| Answer» C. 357 | |
| 4648. |
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm. |
| A. | 1000 to 2000 |
| B. | 3000 to 6000 |
| C. | 6000 to 9000 |
| D. | 10000 to 100000 |
| Answer» E. | |
| 4649. |
Removal of __________ is accomplished by aeration of water. |
| A. | dissolved gases |
| B. | suspended solids |
| C. | dissolved solids |
| D. | none of these |
| Answer» B. suspended solids | |
| 4650. |
Workers working in __________ industry are most prone to white lung cancer. |
| A. | coal mining |
| B. | limestone mining |
| C. | textile |
| D. | asbestos |
| Answer» D. asbestos | |