Q1. ________ is a membrane process, during which ions are transported through a semi-permeable membrane, under the influence of an electric potential.

1. Electrodialysis
2. Reverse Osmosis
3. Ultrafiltration
4. Microfiltration

ANSWER: A.  Electrodialysis

• Explanation: Electro Dialysis (ED) is a membrane procedure in which ions are transferred through a semipermeable membrane while an electric voltage is applied. Electrodialysis is a membrane separation method that uses electricity to separate, concentrate, and purify specific ions from aqueous solutions (as well as some organic solvents).

READ MORE – FOOD TECHNOLOGY (23/08/2021)

Q2. Which among the following factors is important for evaporation?

1. Gas liberation
2. Toxicity
3. Specific heat
4. All of the above

ANSWER: 4. All of the above

• Explanation – When heated to boiling pressures, only a few products release gases. Toxicity – In a few circumstances, the gases released may be harmful and should be handled with caution. The specific heat of a solution varies with its concentration. At high specific heat values, more heat must be given. Economy, capacity, viscosity, concentration, foaming, and heat sensitivity are some of the key aspects to consider.

READ MORE – FOOD TECHNOLOGY (03/09/2021)

Q3. In _________ evaporator, the tubes may be placed in the shape of a ring or tubes.

1. Vertical tube evaporator
2. Horizontal tube evaporator
3. Basket type evaporator
4. Calandria

ANSWER –  3. Basket type evaporator

• Explanation: The tubes in a basket evaporator can be arranged in the shape of a ring or tubes. This machine has an open area around the perimeter to allow the liquid to circulate more freely through the coils, with the heated liquid moving up through the coils and the colder product moving down through the annulus around the basket.

READ MORE – FOOD TECHNOLOGY (13-09-2021)

Q4. The size of the drum provided above the tube bundle in most the evaporators is decided by?

1. The foaming of the liquid in the evaporator
2. The vapour velocity
3. Entrainment separation
4. All of the above

ANSWER: 4. All of the above

• Explanation: In most evaporators, the size of the drum provided above the tube bundle is determined by three critical factors. The foaming of the liquid in the evaporator, the vapour velocity, and the entrainment separation are the three. Foaming occurs above the liquid level and takes up a portion of the vapour drum. The minimum drum diameter is determined by the vapour velocity. The vapour space above the calandria should not be less than one vessel diameter, and the bottom space below the calandria should be one-fourth of the vessel diameter.

READ MORE – FOOD TECHNOLOGY (23/07/2021)

Q5. ________ is a separate drum in which the vapours are admitted tangentially and are made to flow in a helical path by use of baffles.

1. Vapour Release Chamber
2. Entrainment separators
3. Centrifugal Separator
4. Wire Pad

ANSWER – 3. Centrifugal Separator

• Explanation – The centrifugal separator is a separate drum where vapours are admitted tangentially and forced to flow in a helical direction by baffles. The vapours exit through a central pipe or from the top of the drum. At the top of the drum, a centrifugal type baffling device is installed, as illustrated in the diagram. The vapours come through the middle route and are deflected by the baffles, which also separate the liquid.

READ MORE – FOOD TECHNOLOGY (22-09-2021)