MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 20 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. |
Nitriding of steel is done (in electric furnace) at __________ °C. |
| A. | 1720 |
| B. | 510 |
| C. | 910 |
| D. | 2210 |
| Answer» C. 910 | |
| 2. |
Age hardening' of duralumin is due to |
| A. | copper |
| B. | magnesium |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 3. |
Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH) 2 . Lead pipes are readily corroded by |
| A. | dilute HC1 |
| B. | acetic acid |
| C. | concentrated H 2 SO 4 |
| D. | none of these |
| Answer» C. concentrated H 2 SO 4 | |
| 4. |
H 2 SO 4 (< 50% concentration) is corrosive to |
| A. | aluminium, mild steel, stainless steel, concrete & tin. |
| B. | copper, cast iron & high silicon iron (14% Si). |
| C. | rubber (butyl and hard), silicone rubber & teflon. |
| D. | glass, graphite, porcelain & stoneware. |
| Answer» B. copper, cast iron & high silicon iron (14% Si). | |
| 5. |
Alpha iron is stable __________ °C. |
| A. | above 1403 |
| B. | upto 910 |
| C. | above 1800 |
| D. | between 910 & 1403 |
| Answer» C. above 1800 | |
| 6. |
Most suitable material for high pressure vessel operating at 500 atm. and 500° C is |
| A. | molybdenum stainless steel. |
| B. | 18/8 stainless steel. |
| C. | mild steel. |
| D. | high silicon iron (14% Si). |
| Answer» B. 18/8 stainless steel. | |
| 7. |
Concentrated HCl at 30°C can be stored in a vessel made of |
| A. | PTFE and porcelain. |
| B. | cast iron and aluminium. |
| C. | stainless steel and high silicon cast iron. |
| D. | none of these. |
| Answer» B. cast iron and aluminium. | |
| 8. |
100% H 2 SO 4 at 30°C can't be stored in a vessel made/lined with |
| A. | cast iron and high silicon iron. |
| B. | mild steel and stainless steel. |
| C. | aluminium, tin and rubber. |
| D. | teflon, glass and porcelain. |
| Answer» D. teflon, glass and porcelain. | |
| 9. |
Hypersil' is a __________ steel. |
| A. | high speed |
| B. | silicon |
| C. | molybdenum |
| D. | tungsten |
| Answer» C. molybdenum | |
| 10. |
Semi steel' is |
| A. | produced by adding 10-20% steel to the cupola charge. |
| B. | stronger than cast iron. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 11. |
In SO 3 absorber (Contact Process), packing material used is of |
| A. | cast iron |
| B. | chemical stoneware |
| C. | karbate |
| D. | mild steel |
| Answer» C. karbate | |
| 12. |
Approximate value of the modulus of elasticity for steel is about __________ x l0 6 kg/cm 2 . |
| A. | 0.5 |
| B. | 2 |
| C. | 40 |
| D. | 75 |
| Answer» C. 40 | |
| 13. |
Copper is dissolved from its ore by H 2 SO 4 in a percolation tank made of |
| A. | wood |
| B. | stainless steel |
| C. | reinforced concrete lined with lead |
| D. | high silicon iron (14% Si) |
| Answer» D. high silicon iron (14% Si) | |
| 14. |
Bog iron used for the adsorption of H 2 S from coke oven gas is |
| A. | an intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide). |
| B. | iron impregnated with resin (usually bakelite). |
| C. | carbon free iron. |
| D. | none of these. |
| Answer» B. iron impregnated with resin (usually bakelite). | |
| 15. |
Specify the material of construction suitable for handling concentrated HNO 3 at 100°C. |
| A. | High silicon iron, Kel-F and teflon |
| B. | Tin and wood |
| C. | Silicone rubber |
| D. | Stainless steel |
| Answer» B. Tin and wood | |
| 16. |
Nitriding of steel is done (in electric furnace) at __________ °C. |
| A. | 510 |
| B. | 1720 |
| C. | 2210 |
| D. | 910 |
| Answer» B. 1720 | |
| 17. |
SO 3 is absorbed using H 2 SO 4 in a |
| A. | cast iron packed tower. |
| B. | stainless steel plate tower. |
| C. | packed steel tower lined with acid proof bricks. |
| D. | none of these. |
| Answer» D. none of these. | |
| 18. |
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ? |
| A. | Monel |
| B. | Stainless steel |
| C. | Graphite |
| D. | Kel-F and teflon |
| Answer» C. Graphite | |
| 19. |
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C ? |
| A. | Silicone rubber, teflon, procelain and wood. |
| B. | Nickel, monel, stainless steel and graphite. |
| C. | Aluminium, copper, high silicon iron. |
| D. | Brass, cast iron, mild steel and tin. |
| Answer» E. | |
| 20. |
Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH) 2 . Lead pipes are readily corroded by |
| A. | dilute HCI |
| B. | acetic acid |
| C. | concentrated H 2 SO 4 |
| D. | none of these |
| Answer» C. concentrated H 2 SO 4 | |