Questions and answers for exam Preparation

MCQs

Total Questions : 79 | Page 5 of 8 pages

Question 41. Power required for a gassed system is more than that required for an ungassed system.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option B. -> False
Answer: (b).False

Question 42. Statement 1: Froude number relates the gravitational effect which is important when the liquid is agitated by an impeller.
Statement 2: When Nʀₑ,ᵢ < 300, NFr is ineffective.

True, False
True, True
False, False
False, True

Discuss Question

Answer: Option B. -> True, True
Answer: (b).True, True

Question 43. With respect to the relationship between the power number and the impeller Reynolds’s number, which amongst the following statements is true?

In the turbulent region, the Nʀₑ,ᵢ has no impact over Nₚₒ
In the transient region, the Nʀₑ,ᵢ has no impact over Nₚₒ
In the laminar region, the Nₚₒ continually falls as Nʀₑ,ᵢ increases
None of the mentioned

Discuss Question

Answer: Option A. -> In the turbulent region, the Nʀₑ,ᵢ has no impact over Nₚₒ
Answer: (a).In the turbulent region, the Nʀₑ,ᵢ has no impact over Nₚₒ

Question 44. Statement 1: In the transient zone, the power input depends on the density and viscosity of the fluid.
Statement 2: In the laminar zone, the power input depends on the density only. It is independent of the viscosity of the fluid.

True, False
True, True
False, False
False, True

Discuss Question

Answer: Option A. -> True, False
Answer: (a).True, False

Question 45. Statement 1: For non-Newtonian fluids, another term called apparent viscosity is used as their viscosity changes with the change in the shear rate.
Statement 2: For non-Newtonian fluids, between the transition region, the power number for non-Newtonian fluids is slightly higher than that for Newtonian fluids.

True, False
True, True
False, False
False, True

Discuss Question

Answer: Option A. -> True, False
Answer: (a).True, False

Question 46. Statement 1: Where Pg is power for a gassed system and Po is power for an ungassed system, Pg/Po is _____
Statement 2: Na stands for _____

< 1, aeration number
> 1, aeration number
< 1, consistency index
> 1, consistency index

Discuss Question

Answer: Option A. -> < 1, aeration number
Answer: (a).< 1, aeration number

Question 47. With respect to dipping oil emulsions, which of the following is true?

Used for easy dehydration of food
Gives a thin layer of coating on the fruit berries
Dipping oil made from an emulsion by mixing of fatty esters with some amount of aqueous potassium carbonate solutions by high speed impellers
All of the mentioned

Discuss Question

Answer: Option D. -> All of the mentioned
Answer: (d).All of the mentioned

Question 48. Which of the following is an advantage of size reduction?

Enhanced heat/mass transfer
Intimate contact with certain food items
Enhanced heat/mass transfer & intimate contact with certain food items
None of the mentioned

Discuss Question

Answer: Option C. -> Enhanced heat/mass transfer & intimate contact with certain food items
Answer: (c).Enhanced heat/mass transfer & intimate contact with certain food items

Question 49. Which of the following is true with respect to Carbonation?

Gas-liquid mixing
Helps improve storage life
Increased pressure
All of the mentioned

Discuss Question

Answer: Option D. -> All of the mentioned
Answer: (d).All of the mentioned

Question 50. Statement 1: Flat blade/curve blade/arrow head/vaned disc turbines are generally used for gas-liquid mixing.
Statement 2: Helical screw/ribbon mixer/gate anchor are generally used for solid-solid mixing.