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
View Answer
Answer: a
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
View Answer
Answer: b
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
View Answer
Answer: a
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
View Answer
Answer: b
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
View Answer
Answer: c
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
View Answer
Answer: b
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
View Answer
Answer: a
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
View Answer
Answer: a
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
View Answer
Answer: c
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
View Answer
Answer: a
Explanation: Wi or Work index is defined as the gross energy requirement in kilowatt hours per unit ton of feed needed to reduce very large feed to 80%.