Questions and answers for exam Preparation

MCQs

Total Questions : 53 | Page 5 of 6 pages

Question 41. Which oil recovery mechanism yields the most oil andis the most efficient oil recovery mechanism?

Selective plugging by microorganisms and their metabolites
Oil viscosity reduction by gas production
Production of acids by dissolving minerals in the rock
Degradation of long-chain saturated hydrocarbons

Discuss Question

Answer: Option A. -> Selective plugging by microorganisms and their metabolites
Answer: (a).Selective plugging by microorganisms and their metabolites

Question 42. Which microbe is used as a solvent and applied in microbial oil recovery?

Leuconostoc
Xanthomonas
Brevibacterium
Klebsiella

Discuss Question

Answer: Option D. -> Klebsiella
Answer: (d).Klebsiella

Question 43. Some strains of ______ bacteria can produce hydrogen, methane, acetate etc. by ________ of carbohydrates during initial growth phase.

obligate anaerobic; oxidation
facultative aerobic; reduction
obligate anaerobic; fermentation
facultative anaerobic; oxidation

Discuss Question

Answer: Option C. -> obligate anaerobic; fermentation
Answer: (c).obligate anaerobic; fermentation

Question 44. Which commercial bioleaching processes among the following involves piling up of uncrushed waste rock?

In Situ
Dump Leaching
Heap Leaching
Vat Leaching

Discuss Question

Answer: Option B. -> Dump Leaching
Answer: (b).Dump Leaching

Question 45. The maximum temperature that may reach in the interior dump of copper bioleaching is ______

120°C
100°C
90°C
70°C

Discuss Question

Answer: Option C. -> 90°C
Answer: (c).90°C

Question 46. What percentage of total world copper production do bioleach of copper alone contributes?

10%
17%
25%
33.3%

Discuss Question

Answer: Option C. -> 25%
Answer: (c).25%

Question 47. Some heterotrophic bacteria are present in the copper dumps which indirectly affect metal ________ by affecting the growth and activity of metal solubilizing _______

solubilization; bacteria
solubilization; fungi
activity; bacteria
activity; fungi

Discuss Question

Answer: Option A. -> solubilization; bacteria
Answer: (a).solubilization; bacteria

Question 48. Which of the following mechanism is used for bioleaching of uranium?

Direct Leaching Mechanism
Indirect Leaching Mechanism
Acid Leaching Mechanism
Alkali Leaching Mechanism

Discuss Question

Answer: Option B. -> Indirect Leaching Mechanism
Answer: (b).Indirect Leaching Mechanism

Question 49. Which of these is not a strategy for the application of biosurfactants in oil recovery?

Injection of biosurfactants into reservoir through well that produce microorganisms and multiply their growth in-situ
Production of biosurfactants ex-situ while the same is injected into the reservoir
Injecting selected nutrients into the reservoir
Injecting microorganisms along with nutrients producing biomass

Discuss Question

Answer: Option D. -> Injecting microorganisms along with nutrients producing biomass
Answer: (d).Injecting microorganisms along with nutrients producing biomass

Question 50. Less modification of the existing field characteristics are required to implement the recovery process by Microbial Oil Recovery technologies.