Q1. In Deep Freezers, The Walls Absorb Heat From Food Materials By _____ And Keep Them Cool?

A) Conduction
B) Convection
C) Radiation
D) None Of The Mentioned

Answer – C) Radiation

• Deep Freezer Is A Type Of Freezer With The Storage Of Large Quantities Of Food Items. Deep Freezer Maintains A Constant Temperature Of Zero Degrees Of Fahrenheit. In Deep Freezers, The Walls Absorb Heat From Food Materials By Radiation And Keep Them Cool.

READ MORE – FOOD TECHNOLOGY (13/03/2021)

Q2. Radiation Dryers Use _____?

A) Ultraviolet Rays
B) Infrared Radiation
C) Visible Range
D) None Of The Mentioned

Answer – B) Infrared Radiation

• Radiation Dryers Use Infrared Radiation. Infrared Heating Or Drying Involve A Heat Transfer By Radiation Between A Hot Element And A Material At Lower Temperature That Needs To Be Heated Or Dried. The Peak Wavelength Of The Radiation Is Dependant Of The Temperature Of The Heated Element.

Q3. In A Jacketed Vessel, The Only Way To Increase The Heat Transfer Rates Is To Increase The Temperature Difference?

A) True
B) False

Answer – A) True

• A Jacketed Vessel Is A Container That Is Designed For Controlling The Temperature Of Its Contents, By Using A Cooling Or Heating “Jacket” Around The Vessel Through Which A Cooling Or Heating Fluid Is Circulated. In A Jacketed Vessel, The Only Way To Increase The Heat Transfer Rates Is To Increase The Temperature Difference.

READ MORE – FOOD TECHNOLOGY (23/03/2021)

Q4. Which Of The Following Is A Parameter To Be Checked Before Choosing The Shape Of The Pitch In Heat Exchangers?

A) Easiness To Clean
B) High Heat Transfer
C) Cost
D) All Of The Mentioned

Answer – D) All Of The Mentioned

• The Tube Pitch Is The Shortest Center-To-Center Distance Between Tubes. The Tube Spacing Is Given By The Tube Pitch/Tube Diameter Ratio, Which Is Normally 1.25 Or 1.33. All Of The Given Reasons Are To Be Checked Before Choosing The Shape Of The Pitch.

Q5. Which Of The Following Heat Exchangers Are Used For The Quick Exchange Of Heat?

A) Shell And Tube
B) Plate
C) Scraped Surface
D) Jacketed Vessels

Answer – B) Plate

• Plate Heat Exchangers Are Used For The Quick Exchange Of Heat. A Plate Exchanger Consists Of A Series Of Parallel Plates That Are Placed One Above The Other So As To Allow The Formation Of A Series Of Channels For Fluids To Flow Between Them Which Is Also A Reason For Fast Heat Transfer.

READ MORE – FOOD TECHNOLOGY (01/02/2021)

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