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.
| 1051. |
Which of the following gaseous fuels has the lowest calorific value ? |
| A. | Gobar gas |
| B. | Refinery gas |
| C. | Converter gas |
| D. | Blast furnace gas |
| Answer» E. | |
| 1052. |
The function of secondary combustion air is to |
| A. | pneumatically convey the pulverised coal. |
| B. | completely burn the volatile matter. |
| C. | burn the lumpy coal. |
| D. | none of these. |
| Answer» C. burn the lumpy coal. | |
| 1053. |
In high temperature carbonisation of coal compared to low temperature carbonisation |
| A. | yield of ammonia is less. |
| B. | aromatic content of tar is low. |
| C. | H2 content in the coke oven gas is more. |
| D. | calorific value of the coke oven gas is lower. |
| Answer» D. calorific value of the coke oven gas is lower. | |
| 1054. |
Which of the following is called "blue gas" ? |
| A. | coke oven gas |
| B. | water gas |
| C. | natural gas |
| D. | producer gas |
| Answer» C. natural gas | |
| 1055. |
Coke compared to the coal from which it has been made, contains |
| A. | less volatile matter. |
| B. | more carbon. |
| C. | greater percentage of ash. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1056. |
Bomb calorimeter can be used to determine the __________ of the coal. |
| A. | sulphur content |
| B. | calorific value |
| C. | both(a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1057. |
Which of the following coke has the least percentage of ash ? |
| A. | Petroleum coke |
| B. | Beehive coke |
| C. | Foundary coke |
| D. | Metallurgical coke |
| Answer» B. Beehive coke | |
| 1058. |
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation |
| A. | to check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls. |
| B. | because, it alone produces unreactive coke. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1059. |
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm3 . |
| A. | 30 |
| B. | 300 |
| C. | 3000 |
| D. | 30, 000 |
| Answer» C. 3000 | |
| 1060. |
During coking of coal, the ash content (percentage) |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | - |
| Answer» B. decreases | |
| 1061. |
"Micum Index" of a coke is a measure of its |
| A. | reactivity. |
| B. | porosity. |
| C. | bulk density. |
| D. | hardness & strength. |
| Answer» E. | |
| 1062. |
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal. |
| A. | 60 |
| B. | 160 |
| C. | 500 |
| D. | 750 |
| Answer» C. 500 | |
| 1063. |
With increase in C/H ratio of a fuel, the amount of CO2 formed on its complete combustion |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | either (a) or (b), depends on other factors |
| Answer» B. decreases | |
| 1064. |
Gross & net calorific value is the same for |
| A. | blast furnace gas |
| B. | coke oven gas |
| C. | L.D. converter gas |
| D. | none of these |
| Answer» D. none of these | |
| 1065. |
Calorific value of tar is about __________ Kcal/kg. |
| A. | 8800 |
| B. | 12000 |
| C. | 5000 |
| D. | 16000 |
| Answer» B. 12000 | |
| 1066. |
Which of the following is not a 'manufactured' fuel ? |
| A. | LPG |
| B. | Coal briquettes |
| C. | Tar |
| D. | Colloidal fuels |
| Answer» D. Colloidal fuels | |
| 1067. |
Natural draught produced by a chimney depends upon the |
| A. | density of the chimney gases. |
| B. | height of the chimney. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1068. |
Undercharging of coal in the by-product coke ovens results in |
| A. | decrease in the c.v. of coke oven gas. |
| B. | increase in its throughput. |
| C. | increase in the c.v. of coke oven gas. |
| D. | no change in the c.v. of coke oven gas. |
| Answer» B. increase in its throughput. | |
| 1069. |
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ? |
| A. | Multicyclones |
| B. | Bag filter |
| C. | Wet scrubber |
| D. | Hydrocyclones. |
| Answer» C. Wet scrubber | |
| 1070. |
Which of the following coal gasification processes will produce gas having maximum methane content ? |
| A. | Winkler process. |
| B. | Lurgi process. |
| C. | Kopper-Totzek process. |
| D. | All can produce same methane content. |
| Answer» C. Kopper-Totzek process. | |
| 1071. |
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 | |
| 1072. |
Air/gas ratio for complete combustion will be the highest for |
| A. | LPG |
| B. | gobar gas |
| C. | coke oven gas |
| D. | carburetted water gas |
| Answer» B. gobar gas | |
| 1073. |
Atomising steam to fuel oil ratio in a burner should be around |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 3.5 |
| Answer» B. 1.5 | |
| 1074. |
In low temperature carbonisation of coal, the |
| A. | yield of coke oven gas is 290 Nm3 /ton dry coal. |
| B. | volatile matter in coke is zero. |
| C. | temperature maintained is 700°C. |
| D. | yield of tar is about 3% of dry coal. |
| Answer» D. yield of tar is about 3% of dry coal. | |
| 1075. |
Octane number of 2, 2, 4 - trimethyl pen-tane is |
| A. | 0 |
| B. | 100 |
| C. | in between 0 and 100 |
| D. | more than 100 |
| Answer» C. in between 0 and 100 | |
| 1076. |
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent. |
| A. | < 37% |
| B. | >71% |
| C. | in between 37 & 71% |
| D. | none of these |
| Answer» D. none of these | |
| 1077. |
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec. |
| A. | 0.5 |
| B. | 10 |
| C. | 50 |
| D. | 500 |
| Answer» C. 50 | |
| 1078. |
Fixed carbon in coal is defined as |
| A. | that present in volatile matters. |
| B. | the total quantity of carbon present in the coal. |
| C. | hundred minus the percentage of volatile matter, ash and moisture. |
| D. | the one which is present in the residue after combustion. |
| Answer» D. the one which is present in the residue after combustion. | |
| 1079. |
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the |
| A. | requirement of large volume combustion chamber. |
| B. | risk of explosion. |
| C. | chances of clinker formation. |
| D. | incomplete combustion of coal. |
| Answer» C. chances of clinker formation. | |
| 1080. |
In flue gas analysis by Orsat's apparatus, oxygen is absorbed by |
| A. | potassium hydroxide. |
| B. | cuprous chloride. |
| C. | alkaline pyragllol solution. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1081. |
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. | |
| 1082. |
Orsat apparatus is meant for |
| A. | gravimetric analysis of flue gas. |
| B. | finding out combustion efficiency. |
| C. | direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride. |
| D. | none of these. |
| Answer» E. | |
| 1083. |
Size of blast furnace grade coke is __________ mm. |
| A. | 25-80 |
| B. | 0-15 |
| C. | 15-25 |
| D. | >100 |
| Answer» B. 0-15 | |
| 1084. |
Presence of free moisture in coal is most disadvantageous during |
| A. | its pulverisation (as it requires more power). |
| B. | combustion of fire slacks on the grates. |
| C. | handling (e.g. when emptying wagons). |
| D. | none of these. |
| Answer» B. combustion of fire slacks on the grates. | |
| 1085. |
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. | |
| 1086. |
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg. |
| A. | 1000 |
| B. | 4000 |
| C. | 6000 |
| D. | 8000 |
| Answer» C. 6000 | |
| 1087. |
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value. |
| A. | sulphur |
| B. | oxygen |
| C. | hydrogen |
| D. | carbon |
| Answer» C. hydrogen | |
| 1088. |
Turndown ratio of a gas burner is equal to the |
| A. | maximum to minimum heat input ratio. |
| B. | maximum to minimum permissible gas flow rate. |
| C. | both (a) & (b). |
| D. | minimum to maximum heat input ratio. |
| Answer» D. minimum to maximum heat input ratio. | |
| 1089. |
Stack heat losses can be minimised by |
| A. | controlling the excess air. |
| B. | oxygen enrichment of combustion air. |
| C. | using low c.v. fuels. |
| D. | maintaining proper draft in the furnace. |
| Answer» B. oxygen enrichment of combustion air. | |
| 1090. |
Main constituents of purified Lurgi gas are |
| A. | H2, CmHn & CO2 |
| B. | CO, H2 & CH4 |
| C. | CO2, O2 & CO |
| D. | N2, H2 & CO2 |
| Answer» C. CO2, O2 & CO | |
| 1091. |
Quantity of coke produced from metallurgical coal may be around __________ percent. |
| A. | 30 |
| B. | 50 |
| C. | 75 |
| D. | 95 |
| Answer» D. 95 | |
| 1092. |
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ? |
| A. | Vitrain |
| B. | Clarain |
| C. | Durain |
| D. | Fussain |
| Answer» B. Clarain | |
| 1093. |
Combustion of pulverised coal as compared to that of lump coal |
| A. | develops a non-luminous flame. |
| B. | develops a low temperature flame. |
| C. | can be done with less excess air. |
| D. | provides a lower rate of heat release. |
| Answer» D. provides a lower rate of heat release. | |
| 1094. |
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is |
| A. | H2 |
| B. | CH4 |
| C. | CO2 |
| D. | N2 |
| Answer» C. CO2 | |
| 1095. |
Catalyst used in Fischer-Tropsch process is |
| A. | nickel |
| B. | zinc oxide |
| C. | alumina |
| D. | thorium oxide |
| Answer» B. zinc oxide | |
| 1096. |
L.D. converter gas (produced in steel plant) comprises mainly of |
| A. | CO (upto 65%) & CO2 |
| B. | CO2 & H2 |
| C. | CO & O2 |
| D. | CO2 & O2 |
| Answer» B. CO2 & H2 | |
| 1097. |
Volatile matter content of metallurgical coke may be around __________ percent. |
| A. | 43497 |
| B. | 42278 |
| C. | 22-26 |
| D. | 30-33 |
| Answer» B. 42278 | |
| 1098. |
Which of the following is not a product of tar distillation ? |
| A. | Phenol & naphthalene |
| B. | Benzol & pitch |
| C. | Anthracene & creosote |
| D. | None of these |
| Answer» E. | |
| 1099. |
When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the __________ of coal. |
| A. | carbonisation |
| B. | oxidation |
| C. | coalification |
| D. | gasification |
| Answer» E. | |
| 1100. |
Main use of hard coke produced by high temperature carbonisation is in the |
| A. | iron blast furnace |
| B. | cupola in foundaries |
| C. | sinter making |
| D. | domestic ovens |
| Answer» B. cupola in foundaries | |