Discussion
Home ‣ Chemical Engineering ‣ Mechanical Operations See What Others Are Saying!
- Question
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
Options- A. bronze
- B. stainless steel
- C. flint or porcelain
- D. concrete
- Correct Answer
- flint or porcelain
- 1. Use of 'grinding aids' is done in __________ grinding.
Options- A. dry
- B. wet
- C. ultrafine
- D. intermediate Discuss
- 2. Grinding efficiency of a ball mill is of the order of __________ percent.
Options- A. 1-5
- B. 40-50
- C. 75-80
- D. 90-95 Discuss
- 3. Poly tetra flouro ethylene (PTFE) is known as
Options- A. dacron
- B. teflon
- C. bakelite
- D. celluloid Discuss
- 4. German silver used for decorative purposes contains maximum percentage of
Options- A. silver
- B. copper
- C. zinc
- D. nickel Discuss
- 5. Ammonium phosphate is a __________ fertiliser.
Options- A. nitrogenous
- B. phosphatic
- C. complex
- D. mixed Discuss
- 6. Radioactivity of an isotope is expressed in
Options- A. barn
- B. MeV
- C. Curie
- D. Ergs Discuss
- 7. Corrosion of metals can not be prevented by its
Options- A. tempering
- B. chromising
- C. aluminising
- D. alloying Discuss
- 8. The value of 'angle of nip' is generally about
Options- A. 16°
- B. 32°
- C. 52°
- D. 64° Discuss
- 9. Which is a neutral refractory?
Options- A. Graphite
- B. Magnesite chrome
- C. Silica
- D. Magnesia Discuss
- 10. Buna-S is also known as
Options- A. teflon
- B. PTFE
- C. SBR
- D. polycrylates Discuss
More questions
Correct Answer: dry
Correct Answer: 1-5
Correct Answer: teflon
Correct Answer: copper
Correct Answer: mixed
Correct Answer: Curie
Correct Answer: tempering
Correct Answer: 32°
Correct Answer: Graphite
Correct Answer: SBR
Comments
There are no comments.More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.