MCQOPTIONS
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MCQOPTIONS
This section includes 2253 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. |
Resistance of an electrical conductor is proportional to its (where, = length and = cross-sectional area of the conductor) |
| A. | both 'a' & 'b' |
| Answer» E. | |
| 2. |
In troposphere (the weather domain), the temperature '' at height '' above the sea level in metres is given by (where, temperature at sea level is 15°C and is in °C.) |
| A. | = 15 - 0.0065 |
| B. | = 15 + 0.0065 |
| C. | = 0.0035 |
| D. | - 15 |
| E. | = 15 - 0.0035 |
| Answer» B. = 15 + 0.0065 | |
| 3. |
A high pressure boiler generates steam at a pressure greater than __________ kg/cm . |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 80 |
| Answer» E. | |
| 4. |
Nusselt number is related to Grashoff number () in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as |
| A. | , |
| B. | , |
| C. | , |
| D. | , |
| Answer» B. , | |
| 5. |
Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about |
| A. | 1 |
| B. | 10 |
| C. | 25 |
| D. | 50 |
| Answer» C. 25 | |
| 6. |
Velocity of a gas in sound is not proportional to (where, = Absolute temperature of the gas. = Absolute pressure of the gas. = Ratio of specific heats (/) ρ = specific weight of the gas) |
| A. | 1/ |
| B. | 1/ |
| Answer» C. | |
| 7. |
Maximum heat dissipation occurs from a steel wire ( = 0.5 W/m. k) of 15 mm diameter exposed to air ( = 20W/m .k), when the insulation thickness is __________ mm. |
| A. | 15 |
| B. | 25 |
| C. | 10 |
| D. | 30 |
| Answer» C. 10 | |
| 8. |
A thin, flat & square plate measuring 2 m x 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m . The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m °C. |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 9. |
Solidification time of a molten metal in a casting is proportional to (where, = volume of metal & = its surface area ; in the casting) |
| A. | / |
| B. | / |
| C. | / |
| D. | / |
| Answer» E. | |
| 10. |
In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, = velocity, = velocity gradient ). |
| A. | 1/ |
| B. | 1/ |
| Answer» E. | |
| 11. |
Titanium is produced by __________ of Ti Cl. |
| A. | electrolytic reduction |
| B. | calcium reduction |
| C. | magnesium reduction |
| D. | thermal dissociation |
| Answer» D. thermal dissociation | |
| 12. |
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m. °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively. |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 5 | |
| 13. |
Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C. |
| A. | 723 |
| B. | 959 |
| C. | 1147 |
| D. | 1493 |
| Answer» B. 959 | |
| 14. |
FO (s) + CO (g) = Fe (s) + CO (g), = 0. 435 at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FO at 1173 K? |
| A. | 1.0 |
| B. | 1.3 |
| C. | 2.3 |
| D. | 3.3 |
| Answer» E. | |
| 15. |
The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm . |
| A. | 273.15 |
| B. | 225.65 |
| C. | 100.03 |
| D. | 373.15 |
| Answer» C. 100.03 | |
| 16. |
The tensile strength of plastics ranges from __________ kg/mm. |
| A. | 10 to 50 |
| B. | 50 to 100 |
| C. | 0.01 to 0.1 |
| D. | 0.1 to 10 |
| Answer» E. | |
| 17. |
Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called |
| A. | tempering |
| B. | hardening |
| C. | annealing |
| D. | normalising |
| Answer» D. normalising | |
| 18. |
The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C. |
| A. | 768 |
| B. | 908 |
| C. | 1400 |
| D. | 1539 |
| Answer» B. 908 | |
| 19. |
Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is |
| A. | 3 |
| B. | 5 |
| C. | 0.5 |
| D. | 1.5 |
| Answer» C. 0.5 | |
| 20. |
In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C. |
| A. | 20 |
| B. | 60 |
| C. | 120 |
| D. | ∞ |
| Answer» E. | |
| 21. |
The concentration of (H) ions is 4 x 10 in a solution. Then pH of the solution will be (Given log 4 = 0.6 ) |
| A. | 4.4 |
| B. | 5.6 |
| C. | 8.4 |
| D. | 2.4 |
| Answer» B. 5.6 | |
| 22. |
The emf of a Deniell cell can be increased by |
| A. | decreasing the surface area of the electrodes. |
| B. | increasing the concentration of zinc sulphate solution. |
| C. | increasing the surface area of the electrodes. |
| D. | increasing the concentration of copper sulphate solution. |
| Answer» E. | |
| 23. |
A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm. |
| A. | 6 |
| B. | 18 |
| C. | 38 |
| D. | 52 |
| Answer» C. 38 | |
| 24. |
The activity of pure hydrogen gas at 1000°C and 5 atm pressure |
| A. | is always less than 1. |
| B. | is always greater than 1. |
| C. | can be 5. |
| D. | depends on the choice of the standard state. |
| Answer» E. | |
| 25. |
Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to |
| A. | sorbite |
| B. | bainite |
| C. | martensite |
| D. | troostite |
| Answer» C. martensite | |
| 26. |
For efficient performance of a blast furnace, the extent of reduction of Wustite (FO) should be |
| A. | 100% indirect reduction. |
| B. | 100% direct reduction. |
| C. | 50-60% indirect reduction. |
| D. | 30-40% indirect reduction. |
| Answer» D. 30-40% indirect reduction. | |
| 27. |
M index of coke indicates its |
| A. | compressive strength. |
| B. | hardness. |
| C. | abrasion resistance. |
| D. | impact strength. |
| Answer» D. impact strength. | |
| 28. |
Super conduction in metals is observed at a temperature of __________ °K. |
| A. | <100 |
| B. | >100 |
| C. | about 273 |
| D. | about 373 |
| Answer» C. about 273 | |
| 29. |
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : C of copper is 23 J Kmole) |
| A. | 2300 J |
| B. | 4600 J |
| C. | 230 J |
| D. | 2.3 x 10 |
| E. | J |
| Answer» B. 4600 J | |
| 30. |
The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D. |
| A. | 140 |
| B. | 180 |
| C. | 240 |
| D. | 280 |
| Answer» E. | |
| 31. |
Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C. |
| A. | -30.5 |
| B. | -78.5 |
| C. | -183.5 |
| D. | -10.5 |
| Answer» C. -183.5 | |
| 32. |
Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C. |
| A. | 597 |
| B. | 959 |
| C. | 1147 |
| D. | 1493 |
| Answer» E. | |
| 33. |
The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C. |
| A. | 768 |
| B. | 1127 |
| C. | 1359 |
| D. | 1480 |
| Answer» C. 1359 | |
| 34. |
Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C. |
| A. | 80-120 |
| B. | 200-300 |
| C. | 600-800 |
| D. | 1000-1100 |
| Answer» E. | |
| 35. |
Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature. |
| A. | steel |
| B. | lignite |
| C. | water |
| D. | lime stone |
| Answer» D. lime stone | |
| 36. |
Between 230 and 370°C, blue brittleness is caused in mild steel because of the |
| A. | immobility of dislocation. |
| B. | strain-ageing. |
| C. | increase in Young's modulus. |
| D. | strain hardening. |
| Answer» C. increase in Young's modulus. | |
| 37. |
A boy weighing 110 climbs up a 50 ft high vertical destination in 100 seconds. Horse power of the boy is __________ hp. |
| A. | 0.1 |
| B. | 0.5 |
| C. | 0.8 |
| D. | 1 |
| Answer» B. 0.5 | |
| 38. |
The Al O content of cryolite in Hall-Heroult's cell is maintained between __________ percent. |
| A. | 2-5 |
| B. | 18-20 |
| C. | 12-15 |
| D. | 6-12 |
| Answer» B. 18-20 | |
| 39. |
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m of steel strip. |
| A. | 5-10 |
| B. | 1000-1500 |
| C. | 120-500 |
| D. | 1500-3000 |
| Answer» D. 1500-3000 | |
| 40. |
α-rays are |
| A. | negatively charged. |
| B. | positively charged. |
| C. | neutral. |
| D. | same as X-rays. |
| Answer» C. neutral. | |
| 41. |
Current employed in resistance welding ranges from __________ kVA/cm . |
| A. | 1.2 to 2.5 |
| B. | 4.5 to 6.2 |
| C. | 7.5 to 8.5 |
| D. | 10.5 to 15.5 |
| Answer» C. 7.5 to 8.5 | |
| 42. |
Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH) __________ with increasing temperature. |
| A. | increases |
| B. | decreases |
| C. | shows inversion of solubility |
| D. | none of these |
| Answer» B. decreases | |
| 43. |
While the recrystallisation temperature for pure metals is 0.3 , the same for alloys is equal to __________ x (where, Melting temperature). |
| A. | 0.25 |
| B. | 0.45 |
| C. | 0.70 |
| D. | 0.95 |
| Answer» D. 0.95 | |
| 44. |
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm) while the C.V. is same on weight basis (i.e., kcal/kg) ? |
| A. | Propane and acetylene |
| B. | Propane and LPG |
| C. | Sewage gas and gobar gas |
| D. | B.F gas and coke oven gas |
| Answer» E. | |
| 45. |
The hydraulic radius of a circular pipe of diameter '' flowing full is |
| A. | /4 |
| B. | /2 |
| C. | 2 |
| D. | /3 |
| E. | /3 |
| Answer» B. /2 | |
| 46. |
Basicity [%Cao + %MgO/% SiO) of the slag in Indian blast furnace is in the range of |
| A. | 0.7-1.0 |
| B. | 1.1-1.4 |
| C. | 1.5 - 1.8 |
| D. | 2.0 - 2.5 |
| Answer» C. 1.5 - 1.8 | |
| 47. |
Gage pressure within a spherical droplet of a fluid is ''. What will be gage pressure within a bubble of the same size & of the same fluid ? |
| A. | 2 |
| B. | 0.5 |
| C. | 0.25 |
| Answer» C. 0.25 | |
| 48. |
Temperature attained in soldering of metals is about __________ °C. |
| A. | 150-300 |
| B. | 400-500 |
| C. | 650-800 |
| D. | 1000-1100 |
| Answer» B. 400-500 | |
| 49. |
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, = absolute temperature, °K) |
| A. | 1/ |
| B. | 1/ |
| Answer» B. 1/ | |
| 50. |
Theoretical volume of oxygen required for complete combustion of 1Nm of acetylene, in oxy-acetylene welding is __________ Nm . |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 2.5 |
| Answer» E. | |