MCQOPTIONS
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MCQOPTIONS
This section includes 51 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The compressive strength of cement should not be less than about 110Kg/cm 2 after three days & not less than 170Kg/cm 2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm 2 /gm. |
| A. | 800 |
| B. | 1600 |
| C. | 4000 |
| D. | 8500 |
| Answer» C. 4000 | |
| 2. |
Low temperature carbonisation of coal takes place at __________ °C. |
| A. | 300 |
| B. | 1100 |
| C. | 700 |
| D. | 900 |
| Answer» D. 900 | |
| 3. |
In contact process, SO 3 is absorbed in 97% H 2 SO 4 and not in water, because |
| A. | SO 3 gas is sparingly soluble in water. |
| B. | water forms an acid mist, which is difficult to absorb. |
| C. | the purity of acid is affected. |
| D. | scale formation in the absorber is to be avoided. |
| Answer» C. the purity of acid is affected. | |
| 4. |
In an integrated steel plant, NH 3 present in coke oven gas is normally recovered as |
| A. | (NH 4 ) 2 SO 4 |
| B. | NH 4 Cl |
| C. | (NH 4 ) 2 NO 3 |
| D. | liquid NH 3 |
| Answer» B. NH 4 Cl | |
| 5. |
Alum [Al 2 (SO 4 ) 3 ] is used as a coagulant in water treatment to remove |
| A. | colour |
| B. | turbidity |
| C. | bacteria |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 6. |
90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C. |
| A. | <0 |
| B. | 10-30 |
| C. | 250-280 |
| D. | 500-600 |
| Answer» C. 250-280 | |
| 7. |
Fermentator temperature during production of alcohol from molasses is around __________ °C. |
| A. | 5 |
| B. | 30 |
| C. | 150 |
| D. | 300 |
| Answer» C. 150 | |
| 8. |
Consider the production of ammonia from methene and air as raw materials. The catalyst used are: ( i ) __________ for steam reforming of methane and ( ii ) __________ for ammonia synthesis. |
| A. | i - Ni/Al 2 O 3 ; ii - Cu - ZnO/Al 2 O 3 |
| B. | i - Fe/Al 2 O 3 ; ii - Cu - ZnO/Al 2 O 3 |
| C. | i - Ni/Al 2 O 3 ; ii - Fe/Al 2 O 3 |
| D. | i - Fe/Al 2 O 3 ; ii - Ni/Al 2 O 3 |
| Answer» D. i - Fe/Al 2 O 3 ; ii - Ni/Al 2 O 3 | |
| 9. |
Presence of H 2 S in raw water (to be chlorinated) results in the |
| A. | reduced softening capacity of zeolite. |
| B. | increased dosage of chlorine to provide a disinfecting residual in the water. |
| C. | easy removal of its hardness. |
| D. | none of these. |
| Answer» C. easy removal of its hardness. | |
| 10. |
Hydrazine (N 2 H 4 ) is used mainly as a/an |
| A. | explosive |
| B. | rocket fuel |
| C. | detergents additive |
| D. | none of these |
| Answer» C. detergents additive | |
| 11. |
Na 2 CO 3 is called |
| A. | washing soda |
| B. | soda ash |
| C. | plaster of paris |
| D. | calcite |
| Answer» C. plaster of paris | |
| 12. |
CO & H 2 are the constituents of |
| A. | producer gas |
| B. | water gas |
| C. | coke oven gas |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 13. |
Na 2 CO 3 .10H 2 O is called |
| A. | washing soda |
| B. | soda ash |
| C. | slaked lime |
| D. | quicklime |
| Answer» B. soda ash | |
| 14. |
Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in |
| A. | pyrolysis of oil. |
| B. | sintering of porous catalyst. |
| C. | hydrogen embrittlement. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 15. |
Conversion of SO 2 to SO 3 in Monsanto 4-pass converter is about __________ percent. |
| A. | 80 |
| B. | 90 |
| C. | 98 |
| D. | 100 |
| Answer» D. 100 | |
| 16. |
Dry ice (solidified CO 2 ) is used for the |
| A. | storage & shipment of frozen foods and ice-creams. |
| B. | liquefaction of permanent gases. |
| C. | liquefaction of natural gas. |
| D. | none of these. |
| Answer» B. liquefaction of permanent gases. | |
| 17. |
Synthesis gas' meant for the synthesis of organic compound is a variable mixture of |
| A. | N 2 & H 2 |
| B. | CO 2 & H 2 |
| C. | CO & H 2 |
| D. | C & H 2 |
| Answer» D. C & H 2 | |
| 18. |
Flash point of most vegetable oils is about __________ °C. |
| A. | 50 |
| B. | 100 |
| C. | 200 |
| D. | 300 |
| Answer» D. 300 | |
| 19. |
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as |
| A. | it is very corrosive at elevated temperature. |
| B. | its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced). |
| C. | it decomposes on further increasing the temperature. |
| D. | none of these. |
| Answer» C. it decomposes on further increasing the temperature. | |
| 20. |
Ca(OH) 2 is called |
| A. | quicklime |
| B. | slaked lime |
| C. | limestone |
| D. | gypsum |
| Answer» C. limestone | |
| 21. |
The purpose of adding Na 2 CO 3 to water of low alkalinity is to |
| A. | permit the use of alum as a coagulant. |
| B. | increase the softening capacity of zeolite. |
| C. | facilitate easy regeneration of zeolite. |
| D. | all (a), (b) and (c). |
| Answer» B. increase the softening capacity of zeolite. | |
| 22. |
Which is the most efficient absorbant for SO 3 out of the following ? |
| A. | 20% oleum |
| B. | 65% oleum |
| C. | 78%H 2 SO 4 |
| D. | 98%H 2 SO 4 |
| Answer» E. | |
| 23. |
Carbon tetrachloride (CCl 4 ) is the starting raw material for the manufacture of |
| A. | trichloroethylene |
| B. | perchloroethylene |
| C. | parathion |
| D. | methanol |
| Answer» C. parathion | |
| 24. |
CaSO 4 . H 2 O is known as |
| A. | blue vitriol |
| B. | plaster of Paris |
| C. | gypsum |
| D. | zeolite |
| Answer» C. gypsum | |
| 25. |
Sulphuric acid saturated with SO 3 is called |
| A. | concentrated H 2 SO 4 . |
| B. | sulphurous acid. |
| C. | oleum. |
| D. | none of these. |
| Answer» D. none of these. | |
| 26. |
Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ °C. |
| A. | -53 |
| B. | -103 |
| C. | -183 |
| D. | -196 |
| Answer» D. -196 | |
| 27. |
Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C. |
| A. | -83 |
| B. | -183 |
| C. | -196 |
| D. | -218 |
| Answer» C. -196 | |
| 28. |
Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C. |
| A. | 25 |
| B. | 60-70 |
| C. | 150-200 |
| D. | 250-300 |
| Answer» C. 150-200 | |
| 29. |
High temperature carbonisation of coal takes place at __________ °C. |
| A. | 2000 |
| B. | 700 |
| C. | 1100 |
| D. | < 500 |
| Answer» D. < 500 | |
| 30. |
Sand and __________ is fused at 1300°C, to produce sodium silicate. |
| A. | limestone |
| B. | soda ash |
| C. | coke |
| D. | sodium sulphate |
| Answer» C. coke | |
| 31. |
Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C. |
| A. | 15-30 |
| B. | 90-100 |
| C. | 250-300 |
| D. | <0 |
| Answer» B. 90-100 | |
| 32. |
Which of the following contains least amount of N 2 ? |
| A. | Coke oven gas |
| B. | Blast furnace gas |
| C. | Producer gas |
| D. | Water gas (blue gas). |
| Answer» B. Blast furnace gas | |
| 33. |
Vinyl chloride (CH 2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of |
| A. | 4 kgf/cm 2 & 500°C. |
| B. | 10 kgf/cm 2 & 1000°C. |
| C. | 40 kg/cm 2 & 200°C. |
| D. | 100 kgi/cm 2 & 500°C. |
| Answer» B. 10 kgf/cm 2 & 1000°C. | |
| 34. |
The temperature in the calcium carbide furnace is __________ °C. |
| A. | 200-300 |
| B. | 700-850 |
| C. | 2000-2200 |
| D. | 4000-4500 |
| Answer» D. 4000-4500 | |
| 35. |
Argon is the third largest constituent of air (followed by N 2 & O 2 ). Its percentage by volume in air is |
| A. | 0.14 |
| B. | 0.34 |
| C. | 0.94 |
| D. | 1.4 |
| Answer» D. 1.4 | |
| 36. |
In multistage equilibrium conversion of SO 2 to SO 3 (2SO 2 + O 2 2SO 3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO 2 to SO 3 can be increased by |
| A. | increasing the oxygen concentration. |
| B. | putting more quantity of V 2 O 5 catalyst in the converter. |
| C. | removing some quantity of SO 3 during intermediate stage. |
| D. | maintaining low temperature & pressure in the converter. |
| Answer» D. maintaining low temperature & pressure in the converter. | |
| 37. |
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H 2 O = Fe 3 O4 + 4H 2 , is not practised, as it is |
| A. | a slow reaction. |
| B. | a discontinuous reaction (requiring regeneration of iron by water gas intermittently). |
| C. | still in development stage (by employing fluidised bed technique). |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 38. |
Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C. |
| A. | -5 to 0 |
| B. | 5 to 10 |
| C. | 30 to 50 |
| D. | 75 to 80 |
| Answer» D. 75 to 80 | |
| 39. |
Hollander beater' machine used in the paper manufacturing plant does not accomplish the task of |
| A. | final rolling out of paper. |
| B. | cutting of fibres. |
| C. | hydration of fibres. |
| D. | fibrillation of fibre. |
| Answer» B. cutting of fibres. | |
| 40. |
SO 2 is bubbled through hot sugar cane juice to |
| A. | act as an acidifying agent. |
| B. | increase its concentration. |
| C. | increase the amount of molasses. |
| D. | increase the crystal size. |
| Answer» B. increase its concentration. | |
| 41. |
At a given temperature, the equilibrium yield of SO 3 obtained from the oxidation of SO 2 is proportional to (where, P = pressure of the system ) |
| A. | P |
| B. | P |
| C. | P 2 |
| D. | 1/ P |
| Answer» D. 1/ P | |
| 42. |
In the manufacture of H 2 SO 4 , vanadium catalyst as compared to platinum catalyst |
| A. | gives higher conversion efficiency. |
| B. | has a longer life and is not poisoned by arsenic. |
| C. | handles lower SO 2 content gas (7 -10% SO 2 ), thus increasing the capital cost of the plant. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 43. |
Polymerisation product of C 2 F 4 (carbon tetraflouride) is called P.T.F.E (poly chloro tetra flouro ethylene). It is also called |
| A. | polyurethane |
| B. | silicone |
| C. | teflon |
| D. | epoxy resin |
| Answer» D. epoxy resin | |
| 44. |
Conversion of CO to CO 2 by steam in presence of a catalyst is called |
| A. | steam reforming. |
| B. | shift conversion. |
| C. | steam gasification. |
| D. | none of these. |
| Answer» C. steam gasification. | |
| 45. |
Which of the following processes does not produce Cl 2 as a co-product during the manufacture of caustic soda ? |
| A. | Diaphragm electrolytic cell process |
| B. | Mercury electrolytic cell process |
| C. | Lime-soda process |
| D. | None of these |
| Answer» D. None of these | |
| 46. |
Absorption of SO 3 in 97% H 2 SO 4 is |
| A. | exothermic |
| B. | endothermic |
| C. | not possible |
| D. | none of these |
| Answer» B. endothermic | |
| 47. |
Heating of __________ to 120°C, produces plaster of paris. |
| A. | blue vitriol |
| B. | gypsum |
| C. | calcium silicate |
| D. | calcium sulphate |
| Answer» C. calcium silicate | |
| 48. |
Fermentation of molasses to produce ethyl alcohol is done at __________ °C |
| A. | 20 - 30 |
| B. | < - 5 |
| C. | 100 - 150 |
| D. | 250 - 300 |
| Answer» B. < - 5 | |
| 49. |
The combustion reaction, C + O 2 = CO 2 , is |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | none of these |
| Answer» B. endothermic | |
| 50. |
The gasification reaction represented by, C + H 2 O = CO + H 2 , is a/an __________ reaction. |
| A. | exothermic |
| B. | endothermic |
| C. | catalytic |
| D. | autocatalytic |
| Answer» C. catalytic | |