Food Engineering

Unit Operations

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In Bernoulli’s equation, the friction correction factor is added to the LHS and the energy contributed by the pump is written on the RHS.
True
False
Explanation:
In the Bernoulli’s equation, the friction correction factor is added to the RHS and the energy contributed by the pump is written on the LHS.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Velocity gradient is the main driving force in mass transfer.
True
False
Explanation:
Velocity gradient is the main driving force in momentum transfer.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Steady state heat transfer, Unsteady state heat transfer
Unsteady state heat transfer, Steady state heat transfer
None of the mentioned
All of the mentioned
Explanation:
‘a’ refers to Steady state heat transfer and ‘b’ refers to unsteady state heat transfer.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: The radius of neutral zone depends on the radius of the centrifuge.
True, False
True, True
False, False
False, True
Explanation:
The radius of neutral zone depends on the radius of the centrifuge. More is the radius, more is the zone of centrifuge as it depends on the difference of the radii of the heavy and light zones.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Tubular bowl centrifuges can handle slurries.
True, False
True, True
False, False
False, True
Explanation:
Tubular bowl centrifuges are used for liquid-liquid separation. Tubular bowl centrifuges can be used for 2 phase liquid-liquid separation only.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following dryers is used for making baby food?
Pneumatic conveyor dryer
Drum dryer
Freeze dryer
Spray dryer
Explanation:
Drum dryers are used for making baby food mostly because they take feed in the form of slurries.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The energy loss due to the friction at the walls of a pipe is called _____
Kinetic friction
Skin friction
Static friction
None of the mentioned
Explanation:
The energy loss due to the friction at the walls of a pipe is called Skin friction.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The area of neutral zone, in a centrifuge is __________
Between the heavy and light liquid
Next to the light liquid and away from the heavy liquid
Next to the heavy liquid and away from the light liquid
Above the heavy liquid and below the light liquid
Explanation:
The area of neutral zone, in a centrifuge is between the heavy and light liquid.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is untrue about scraped surface heat exchangers?
They’re unsuitable for viscous fluids
They’re suitable for fouling fluids
They’re used for continuous operation and have a double pipe
None of the mentioned
Explanation:
Scraped surface heat exchangers are suitable for viscous fluids.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
High residence time encourages _____
Attrition
Crystal growth
Attrition & Crystal growth
None of the mentioned
Explanation:
High residence time encourages attrition.