MCQOPTIONS
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MCQOPTIONS
This section includes 1154 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?$? |
| A. | 50 |
| B. | 70 |
| C. | 85 |
| D. | 100 |
| Answer» E. | |
| 602. |
The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.? |
| A. | Lower than |
| B. | Higher than |
| C. | Same as |
| D. | Not related to |
| Answer» B. Higher than | |
| 603. |
Most of the coking coals are? |
| A. | Anthracite |
| B. | Bituminous |
| C. | Lignite |
| D. | None of these |
| Answer» C. Lignite | |
| 604. |
Number of macrocomponents present in coal according to Stopes are? |
| A. | Four |
| B. | Five |
| C. | Six |
| D. | Two |
| Answer» B. Five | |
| 605. |
'Mixed gas' used in steel plants is a mixture of? |
| A. | B.F. gas and coke oven gas |
| B. | Coke oven gas and converter gas |
| C. | Coke oven gas and L.P.G |
| D. | Blast furnace gas and naphtha vapor |
| Answer» B. Coke oven gas and converter gas | |
| 606. |
Naphthalene is used for making? |
| A. | Insecticides (e.g. moth balls) |
| B. | Unsaturated polyesters |
| C. | Drug intermediates e.g. β-naphthol |
| D. | All of the above |
| Answer» E. | |
| 607. |
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the? |
| A. | Gas yield is less |
| B. | Tar yield is more |
| C. | Ignition temperature of coke produced is less |
| D. | Aromatic content of tar produced is more |
| Answer» E. | |
| 608. |
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.? |
| A. | 5 |
| B. | 25 |
| C. | 55 |
| D. | 75 |
| Answer» C. 55 | |
| 609. |
Presence of force moisture in coal is most disadvantageous during its? |
| A. | Transportation and handling |
| B. | Washing |
| C. | Pulverisation |
| D. | Storage |
| Answer» D. Storage | |
| 610. |
Stack (chimney) height in a big thermal power plant is dictated by the? |
| A. | Pollution control aspect |
| B. | Draught to be created |
| C. | Limitation of constructional facilities |
| D. | None of these |
| Answer» C. Limitation of constructional facilities | |
| 611. |
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about? |
| A. | 8800 kcal/m³ |
| B. | 8800 kcal/kg |
| C. | Same as that of coal middling |
| D. | 25000 kcal/kg |
| Answer» C. Same as that of coal middling | |
| 612. |
Anthracite coal? |
| A. | Contains more volatile matter than bituminous coal |
| B. | Ignites more easily than bituminous coal |
| C. | Is essentially a coking coal |
| D. | Burns with short, bluish, yellow-tipped flame producing very little smoke |
| Answer» E. | |
| 613. |
Adiabatic flame temperature of a fuel is dependent on the initial temperature of? |
| A. | Fuel |
| B. | Air |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 614. |
Percentage of methane in coke oven gas may be around? |
| A. | 5 |
| B. | 15 |
| C. | 25 |
| D. | 50 |
| Answer» D. 50 | |
| 615. |
Main constituents of purified Lurgi gas are? |
| A. | H‚ÇÇ, CmHn & CO‚ÇÇ |
| B. | CO, H‚ÇÇ & CH‚ÇÑ |
| C. | CO‚ÇÇ, O‚ÇÇ & CO |
| D. | N‚ÇÇ, H‚ÇÇ & CO‚ÇÇ |
| Answer» C. CO‚Äö√á√á, O‚Äö√á√á & CO | |
| 616. |
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.? |
| A. | 1kg mole |
| B. | 22.4 Nm³ |
| C. | 32 kg |
| D. | All of the above |
| Answer» E. | |
| 617. |
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.? |
| A. | Bomb |
| B. | Boy's |
| C. | Junkar's |
| D. | None of these |
| Answer» B. Boy's | |
| 618. |
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in? |
| A. | KOH |
| B. | Ammoniacal cuprous chloride |
| C. | Pyrogallol solution |
| D. | None of these |
| Answer» E. | |
| 619. |
Purity of coke means that, it is high in carbon and low in? |
| A. | Volatiles |
| B. | Ash |
| C. | Iron |
| D. | Moisture |
| Answer» B. Ash | |
| 620. |
A fuel with high heat release rate will? |
| A. | Require smaller combustion chamber |
| B. | Have high calorific value |
| C. | Have high adiabatic flame temperature |
| D. | None of these |
| Answer» B. Have high calorific value | |
| 621. |
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?? |
| A. | 50 |
| B. | 70 |
| C. | 85 |
| D. | 100 |
| Answer» E. | |
| 622. |
Ultimate analysis of coal determines its __________ content.? |
| A. | Carbon, hydrogen, nitrogen & sulphur |
| B. | Carbon, ash, sulphur & nitrogen |
| C. | Carbon, sulphur, volatile matter & ash |
| D. | Carbon, volatile matter, ash & moisture |
| Answer» B. Carbon, ash, sulphur & nitrogen | |
| 623. |
Coke ovens in steel plant are heated by? |
| A. | Electricity |
| B. | Coke oven gas |
| C. | Mixed gas |
| D. | Both B & C |
| Answer» E. | |
| 624. |
Which of the following would require least amount of secondary air for combustion?? |
| A. | Coke breeze containing 25% ash and 2% volatile matter |
| B. | Anthracite containing 10% volatile matter and 8% ash |
| C. | Bituminous coal containing 20% ash and 25% volatile matter |
| D. | Semi-bituminous coal containing 25% ash and 20% volatile matter |
| Answer» B. Anthracite containing 10% volatile matter and 8% ash | |
| 625. |
Soft coke is not? |
| A. | Produced by low temperature carbonisation of coal |
| B. | A domestic fuel |
| C. | Used in blast furnaces |
| D. | None of these |
| Answer» D. None of these | |
| 626. |
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 | |
| 627. |
The maximum adiabatic flame temperature is attained, when the fuel is burnt with? |
| A. | Theoretically required amount of air |
| B. | More than theoretically required amount of air |
| C. | Less than theoretically required amount of air |
| D. | Theoretically required amount of oxygen |
| Answer» E. | |
| 628. |
Which of the following fuel gases is heavier than air?? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Natural gas |
| D. | Water gas |
| Answer» B. Coke oven gas | |
| 629. |
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | Unpredictable |
| Answer» D. Unpredictable | |
| 630. |
The gas which contributes maximum to the heating value of natural gas is? |
| A. | CO |
| B. | CO‚ÇÇ |
| C. | H‚ÇÇ |
| D. | CH‚ÇÑ |
| Answer» E. | |
| 631. |
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 of the above |
| Answer» E. | |
| 632. |
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.? |
| A. | 50 |
| B. | 1000 |
| C. | 5000 |
| D. | 10000 |
| Answer» B. 1000 | |
| 633. |
Use of excess of combustion air in the combustion of fuels results in? |
| A. | Heat losses |
| B. | Long flame |
| C. | Condensation of water vapour from the fuel gas |
| D. | None of these |
| Answer» B. Long flame | |
| 634. |
Coal is pulverised before burning in large capacity boiler furnaces mainly to? |
| A. | Ensure its complete combustion |
| B. | Facilitate easy ash removal |
| C. | Enhance its calorific value |
| D. | Provide trouble free operation |
| Answer» B. Facilitate easy ash removal | |
| 635. |
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be? |
| A. | Low |
| B. | High |
| C. | Very high, if the fuel is of low calorific value |
| D. | None of these |
| Answer» B. High | |
| 636. |
Ammonia content in raw coke oven gas is about __________ gm/Nm³.? |
| A. | 1 |
| B. | 15 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 637. |
The main product of high temperature carbonisation of coal is? |
| A. | Coke |
| B. | Ammonia |
| C. | Tar |
| D. | Coke oven gas |
| Answer» B. Ammonia | |
| 638. |
Which of the following is unsuitable fuel for producer gas manufacture?? |
| A. | Coke |
| B. | Anthracite |
| C. | Coal having low fusion point of its ash |
| D. | Coal having high fusion point of its ash |
| Answer» D. Coal having high fusion point of its ash | |
| 639. |
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.? |
| A. | 30 |
| B. | 65 |
| C. | 120 |
| D. | 180 |
| Answer» C. 120 | |
| 640. |
The main function of primary air in pulverised coal fired burner is to? |
| A. | Burn CO to CO‚ÇÇ |
| B. | Dry and transport the coal |
| C. | Have proper combustion by supplying it around the burner |
| D. | Preheat the tertiary air used for complete combustion of CO to CO‚ÇÇ |
| Answer» C. Have proper combustion by supplying it around the burner | |
| 641. |
Traces of tar fog present in the coke oven gas is removed by? |
| A. | Cyclone separator |
| B. | Wet packed scrubber |
| C. | Electrostatic precipitator |
| D. | Washing with monoethanolamine |
| Answer» D. Washing with monoethanolamine | |
| 642. |
Which of the following is coking?? |
| A. | Vitrain |
| B. | Fussain |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» B. Fussain | |
| 643. |
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.? |
| A. | Hydrogen |
| B. | Methane |
| C. | Unsaturated hydrocarbons |
| D. | All of the above |
| Answer» B. Methane | |
| 644. |
Fussain? |
| A. | Is friable, charcoal like substance |
| B. | Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal |
| C. | Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation |
| D. | All of the above |
| Answer» E. | |
| 645. |
Combustion of pulverised coal compared to the lumpy coal? |
| A. | Provides better control of furnace temperature |
| B. | Facilitates combustion with lower excess air |
| C. | Provides higher thermal efficiency & flame temperature |
| D. | All of the above |
| Answer» E. | |
| 646. |
With increase in the oxygen content of the coal, its __________ decreases.? |
| A. | Calorific value |
| B. | Caking power |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 647. |
Nitrogen in coal? |
| A. | Is present upto 1-2% |
| B. | Comes from protein in parent vegetable matter |
| C. | Is recovered as ammonia during its carbonisation |
| D. | All of the above |
| Answer» E. | |
| 648. |
A coal having higher volatile matter content will necessarily have lower? |
| A. | Ash fusion temperature |
| B. | Calorific value |
| C. | Ignition temperature |
| D. | Caking index |
| Answer» D. Caking index | |
| 649. |
During its calorific value determination by bomb calorimeter, coal is combusted by? |
| A. | Air |
| B. | Oxygen |
| C. | Oxygen enriched air |
| D. | None of these |
| Answer» C. Oxygen enriched air | |
| 650. |
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.? |
| A. | Type (solid, liquid or gaseous) |
| B. | Calorific value |
| C. | Sulphur content |
| D. | Ignition temperature |
| Answer» B. Calorific value | |