Engineering Questions with Answers - Multiple Choice Questions

# Mechanical Operations MCQ’s – Mechanism of Size Reduction

1 - Question

In the below equation, When n=1 it yields? a) Kick’s law
b) Bond’s law
c) Rittingers law
d) Bose equation

Explanation: when we substitute n = 1, in the above equation we get an integral form of equation, which then integrated over a and b yield kick’s law.

2 - Question

The below equation hold true for ____ a) Kick’s law
b) Rittingers law
c) James law
d) Camp law

Explanation: when we substitute n = 1, in the above equation we get the Rittingers law equation over the particle size Dsa and Dsb.

3 - Question

On which of the following, Kf and Kk depends?
a) Type of machine
b) Type of power
c) Type of operation
d) Type of law

Explanation: Both Kick’s and Rittingers law is applied over a limited range of the particles size, hence Kf and Kk depend upon type of machine.

4 - Question

The most accurate law for estimating the power is ____
a) Rittingers law
b) Bond’s law
c) Kick’s law
d) Power law

Explanation: Bond’s law is more realistic for estimating the power required for the crushing and grinding operations of any kind.

5 - Question

According to Bond, the work required is proportional to ____
a) Surface to volume ratio
b) Square of surface to volume ratio
c) Square root of surface to volume ratio
d) New surface area created

Explanation: The Bond law states that the work required to form a particle of size Dp from a very large feed is proportional to square root of surface to volume ratio.

6 - Question

What is the surface to volume ratio?
a) Sp/Dp
b) Sp/Vp
c) Dp/Vp
d) Dp/Kp

Explanation: The surface to volume ratio is given as Sp/Vp, where Sp is surface area and Vp is the volume of the feed.

7 - Question

What does the below equation represents? a) Bond’s law
b) Kick’s law
c) Rittingers law
d) Camp law

Explanation: The above equation represents the Bond’s law, where P is the power required and m is the mass of the feed and Kb is the Bond’s constant.

8 - Question

On which of the following, Kb depends?
a) Type of machine and material
b) Type of power
c) Type of operation
d) Type of law

Explanation: According to Bond’s law, the Bond’s constant Kb depends upon the type of machinery used and the type of feed applied.

9 - Question

In below equation, what value of n yields Bond’s law? a) 0
b) 0.5
c) 1.5
d) 1

Explanation: The generalized differential equation when equated n equals to 1.5 yields the Bond’s law in particular.

10 - Question

The gross energy requirement is called as ____
a) Work index
b) Power index
c) Energy index
d) Final index