Engineering Questions with Answers - Multiple Choice Questions
Mechanical Operations MCQ’s – Ultra-Fine Grinders
1 - Question
Jigging involves ______
a) Pulsation
b) Vibration
c) Shaking
d) Digging
View Answer
Answer: a
Explanation: Jigging is one of the oldest method used for processing heavy minerals from light ones by pulsation of stream of liquid flowing through a bed of materials.
2 - Question
Jigging is best suited for ___
a) Drag materials
b) Fine materials
c) Coarse materials
d) Higher materials
View Answer
Answer: c
Explanation: Jigging is best suited for coarse material that is in the size range of 20 mesh and coarser where it is considerable difference between specific gravity.
3 - Question
What are the dimensions of a jig?
a) 5 by 16 ft
b) 10 by 18 ft
c) 20 by 30 ft
d) 5 by 5 ft
View Answer
Answer: a
Explanation: The standard dimensions of a jig are 5 by 16 feet’s, and will treat minus 3/8 inch ore at a rate of 30 to 45 T/hr.
4 - Question
Separation by flowing pulp is achieved in _____ process.
a) Jigging
b) Tabling
c) Drilling
d) Raking
View Answer
Answer: b
Explanation: Tabling is a concentration process whereby a separation between two or more materials is affected by flowing pulp across the material.
5 - Question
Wilfley rifled tables are used for _____
a) 5 to 100 mesh size
b) 1 to 5 mesh size
c) 6 to 150 mesh size
d) 20 to 200 mesh size
View Answer
Answer: c
Explanation: Wilfley tables are effectively used in the size range of 6 to 150 mesh but can be used to treat light materials of a considerable size.
6 - Question
How are particles classified magnetically?
a) Dia and Para magnetic
b) Bi and Pseudo magnetic
c) Half and full magnetic
d) Kinch and lynch magnetic
View Answer
Answer: a
Explanation: Solid may be classified into two broad categories as Diamagnetic and Paramagnetic, any solid placed in a magnetic field is affected by it somehow.
7 - Question
Solids which are repelled by a magnet are called ____
a) HI magnetic
b) Short magnetic
c) Paramagnetic
d) Diamagnetic
View Answer
Answer: d
Explanation: Diamagnetic materials are repelled by a magnetic field, the applied magnetic field creates a magnetic field in them in the reverse direction, causing a repulsion.
8 - Question
Solids which are attracted by a magnet are called ____
a) Full magnetic
b) Short magnetic
c) Paramagnetic
d) Diamagnetic
View Answer
Answer: c
Explanation: Para magnetism is whereby certain materials are attracted by an externally applied magnetic field, it induces magnetic fields in the same direction of magnetic field.
9 - Question
The higher the magnetic field, the higher the ___
a) Separation
b) Unwanted particles
c) Flow
d) Current
View Answer
Answer: a
Explanation: Inducing a higher magnetic field results in a higher number of separation from the bulk materials, this also increases the power requirement.
10 - Question
On what speed does the electromagnetic pulley operates?
a) 100 ft. /min
b) 680 ft. /min
c) 500 ft. /min
d) 700 ft. /min
View Answer
Answer: c
Explanation: Electromagnetic pulleys are primarily obtained at a belt speed of 500 ft./min, if a higher speed is required then pulley of larger diameter is selected.