Food Engineering Questions and Answers – Unit Operations – Size Reduction and Seperation-2

This set of Food Engineering Questions for campus interviews focuses on “Unit Operations – Size Reduction and Seperation-2”.

1. Which of the following is used for shredding meat in the food industry?
a) Ball mill
b) Hammer mill
c) Knife cutter
d) All of the mentioned

Explanation: A knife cutter which is basically a rotating plate with several knives which is used for shredding meat in the food industry.

2. Which of the following food operation does NOT use the principle of size reduction for its operation?
a) Slaughtering of birds for food
b) Trimming of fish to remove inedible portions
c) Mincing of meat
d) None of the mentioned

Explanation: Slaughtering of birds for food involves cutting. Trimming of fish to remove inedible portions and mincing of meat are also food operations which require size reduction methods.

3. 4 screens can separate _____ differently sized particles.
a) 3
b) 4
c) 5
d) 6

Explanation: 4 screens can separate 5 differently sized particles. The number of particle sizes that can be obtained from n number of screens is always n+1.

4. Statement 1: As mesh size increases, the aperture size decreases.
Statement 2: In British standards, the ratio of the aperture size of two consecutive screens is a ratio of 1.412.
a) True, False
b) True, True
c) False, False
d) False, True

Explanation: As mesh size increases, the aperture size decreases. Mesh size refers to the number of mesh openings present in one inch. Hence as the aperture seize increases, the number of meshes per inch decrease. In Tyler series, the ratio of the aperture size of two consecutive screens is a ratio of 1.412. (Square root of 2)

5. With respect to the Tyler series, which of the following is true?
a) The ratio of one mess size to the intermediate mesh will have the ratio of 4th root of 2
b) Intermediate messes cannot be accommodated in the Tyler series
c) Intermediate meshes can be accommodated in British series only
d) None of the mentioned

Explanation: Intermediate meshes can be accommodated in Tyler series and the ratio of one mess size to the intermediate mesh will have the ratio of 4th root of 2

6. In differential screen analysis, for calculating the particle size of the food particles on any one sieve, the average food particle size on that sieve is the mean of the screen opening of that sieve and the sieve below it.
a) True
b) False

Explanation: In differential screen analysis, for calculating the particle size of the food particles on any one sieve, the average food particle size on that sieve is the mean of the screen opening of that sieve and the sieve above it.

7. Which of the following is NOT a reason to affect the effectiveness of a screen?
a) Broken mesh wires
b) Insufficient time for food particles to pass through the sieve
c) Blocked apertures
d) None of the mentioned

Explanation: All of the mentioned are valid reasons that affect the effectiveness of the screen.

8. Stationary screens can be used for wet particles.
a) True
b) False

Explanation: Stationary screens only rely upon gravity for the settling and movement of particles from one screen to another. Hence they cannot be used for wet particles.

9. Gyratory screens are used when it is a continuous operation to be handled and the amount of material to be handled is very high.
a) True
b) False

Explanation: Gyratory screens are used when it is a continuous operation to be handled and the amount of material to be handled is very high.

10. The overall effectiveness of sieve equipment is the _____ of the effectiveness of the underflow and the overflow separately.
b) Multiplication
c) Difference
d) Division

Explanation: The overall effectiveness of sieve equipment is the multiplication of the effectiveness of the underflow and the overflow separately.

Sanfoundry Global Education & Learning Series – Food Engineering.

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