Questions and answers for exam Preparation

MCQs

Total Questions : 270 | Page 5 of 27 pages

Question 41. Concentration is different than drying.

True
False
May be True or False
Can't say

Discuss Question

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

Question 42. Which evaporators can be used when a low degree of concentration is required?

Falling film evaporator
Circular type evaporator
Tubular type evaporator
Plate type evaporator

Discuss Question

Answer: Option B. -> Circular type evaporator
Answer: (b).Circular type evaporator

Question 43. Evaporation in dairy industry is a preliminary step to which of the following process?

Drying
Flavoring
Watering
Pasteurization

Discuss Question

Answer: Option A. -> Drying
Answer: (a).Drying

Question 44. Evaporation in dairy industry is done under __________

Vacuum
Heater
Dryer
Pasteurizer

Discuss Question

Answer: Option A. -> Vacuum
Answer: (a).Vacuum

Question 45. Which of the following is not the reason for the concentration of food liquids?

reduce the cost of drying
induce crystallization
reduce costs for storage and transportation
increase water activity in order to increase microbiological and chemical

Discuss Question

Answer: Option D. -> increase water activity in order to increase microbiological and chemical
Answer: (d).increase water activity in order to increase microbiological and chemical

Question 46. Which of the following is the application of direct heating in the dairy industry?

Heating curd in the manufacture of cheese
Solar heating
Heating with gamma rays
Oxidation

Discuss Question

Answer: Option A. -> Heating curd in the manufacture of cheese
Answer: (a).Heating curd in the manufacture of cheese

Question 47. Calculate temperature change: 20,000 l/h cheese milk (V1) is to be heated from 4°C to 34°C by 30,000 l/h hot water (V2) at 50°C. Density (r) and specific heat (cp) for milk are about 1020 kg/m³ and 3.95 kJ/kg, K and for water 990 (at 50°C) and 4.18.

20.5℃
21.5℃
18.8℃
19.5℃

Discuss Question

Answer: Option D. -> 19.5℃
Answer: (d).19.5℃

Question 48. If the product flow rate in a plant is to be increased from 10,000 l/h to 20,000 l/h, the heat exchanger must be extended to_______ the original size, provided the flow rates of the service media are also doubled, other factors being constant.

Double
Triple
Same
Quadruple

Discuss Question

Answer: Option A. -> Double
Answer: (a).Double

Question 49. The temperature difference between the two liquids is best utilized if they flow in opposite directions through the heat exchanger. This type of flow is called ________