TECHNICAL ENGLISH 2013

TECHNICAL ENGLISH 2015 HOMEWORK 6 - VERB RECOGNITIONACTIVITIES: 1. Read every sentence and underline the main verb or verbs.2. In the parenthesis, write the past or present tense of the verbs, and then, read the new sentences.

EXAMPLE: Pyrometallurgy involves high temperature processes where chemical reactions take place. (involved), (took place) 1. Mine water will contain residual ammonium ion from the explosives used yesterday. (____________)2. Particle size reduction could not be required to permit efficient separation of the valuable materials from gangue. (______________)3. Separation processes take advantage of physical properties of the materials in order to separate them from each other. (____________________)4. Separation processes involved the use of water, solid-liquid separation processes were also a subject of mineral processing. (____________________), (__________________)5. Hydrometallurgy is concerned with processes that include aqueous solutions to extract metals from ores. (______________________), (______________________)6. Smelting is a chemical reaction that requires a particular ore, that sometimes look like any other common sedimentary rock. (___________________), (_________________),(______________________) 7. Probably, the first smelting may have been done by accident by making a campfire on top of tin or lead ores. (_____________________)8. Nobody knew when the earliest cast tin artifacts were made, given that tin was much more uncommon than lead. (____________), (_____________), (______________)9. Pottery kilns produce ceramics that can be glazed with colorful earths to produce colorful vases. (_________________),(_________________) 10. Mineral processing has been used to manipulate the particle size of solid raw materials. (_________)11. In these towers, the gas passes upwards counter-current to a descending spray of water.

(____________________)

12. All powder metallurgy methods begin with the raw material in the form of a powder.

(___________________)

13. Powder metallurgy processes include pressing and sintering. (______________)14. Powder metallurgy competes with several more conventional metalworking methods.

(___________________)

15. The direct-arc furnace charges will be heated principally by radiation from the arc.

(_________________)

16. The analysts agreed that Western capacity cuts were likely to end by the end of the year. (________________), (______________)17. The technological development of the Corporation has made possible important improvements in open pit and underground mining. (______________)18. Everyone knows comminution out of his daily life as methods like cutting, crushing, grinding and rasping. (___________________)19. Treatment of effluent streams focuses on the products that are produced. (____________), (____________)20. The presence of significant interfacial disturbance has already been observed. (_______________)21. Plastics and ceramics were non-metals; however, plastics could be machined like metals. (_______________), (_______________)22. The primary material should be divided into many small individual particles. (_______________)23. Thermosets cannot be reshaped, because they undergo chemical changes as they harden. (_______________), (_______________), (_______________)24. The incorporation of technology into copper mining makes possible greater efficiency of the production processes as well as exploiting deposits where metal extraction is difficult. (_______________), (_______________)25. If the products are hazardous, additional treatment may have been required before disposal is possible. (_______________), (_______________), (_______________)26. Engineers has also to understand the properties of these materials and how they can be worked. (_______________), (_______________) 27. The environmentally unacceptable working conditions could not be accepted by workers who might suffer the consequences of the chemical emissions. (_______________), (_______________)