Engineering Questions with Answers - Multiple Choice Questions

# Food Engineering MCQ’s – Unit Operations – Size Reduction and Seperation-2

1 - Question

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 - Question

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 - Question

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 - Question

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 - Question

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 - Question

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 - Question

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 - Question

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 - Question

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 - Question

The overall effectiveness of sieve equipment is the _____ of the effectiveness of the underflow and the overflow separately.