Mining crushers are critical machines used in the mining industry to crush and process raw materials. Below are some key objective questions and answers related to mining crushers:
Question:
A mining crusher is primarily used for:
a) Drilling holes in the earth
b) Crushing rocks and ores into smaller sizes
c) Sorting minerals by weight
d) Grinding minerals to powder
Answer:
b) Crushing rocks and ores into smaller sizes
A mining crusher is used to reduce large rocks into smaller, manageable pieces for further processing.
Question:
Which of the following is not a type of mining crusher?
a) Jaw Crushers
b) Cone Crushers
c) Ball Mills
d) Impact Crushers
Answer:
c) Ball Mills
Ball mills are grinding devices used for processing materials after the crushing stage, not crushers themselves.
Question:
The primary crusher is mainly used for:
a) Refining minerals
b) Processing finished goods
c) Initial size reduction of raw materials
d) Transporting minerals
Answer:
c) Initial size reduction of raw materials
A primary crusher is the first stage in the crushing process; it handles large chunks of raw materials.
Question:
Crusher jaws and cones are typically made of:
a) Aluminum
b) High manganese steel
c) Plastic
d) Copper
Answer:
b) High manganese steel
High manganese steel is used due to its durability and resistance to wear, especially for crushing hard materials.
Question:
A secondary crusher is used to:
a) Transport ore
b) Perform the initial size reduction
c) Further reduce the size of the material after the primary crusher
d) Process finished mineral products
Answer:
c) Further reduce the size of the material after the primary crusher
Secondary crushers are used after the primary crusher to achieve finer material sizes.
Question:
The following crushers are suitable for tertiary crushing (fine crushing):
a) Hammer crusher
b) Roll crusher
c) Cone crusher
d) Gyratory crusher
Answer:
c) Cone crusher
Cone crushers are widely used for tertiary crushing due to their ability to produce finely crushed materials.
Question:
The principle of operation of a jaw crusher involves:
a) Rotating hammers that crush the material
b) A mantle and concave crushing the material
c) Compression between two jaws to reduce size
d) Continuous grinding
Answer:
c) Compression between two jaws to reduce size
Jaw crushers operate by compressing material between a stationary jaw and a moving jaw.
Question:
Cone crushers are preferred over jaw crushers for:
a) Handling sticky materials
b) Producing finer particle sizes
c) Being easier to maintain
d) Crushing larger rocks
Answer:
b) Producing finer particle sizes
Cone crushers are better suited for secondary and tertiary crushing, producing finer output.
Question:
Compared to jaw crushers, gyratory crushers:
a) Can process larger materials
b) Are cheaper and easier to maintain
c) Are less efficient for primary crushing
d) Use horizontal motion instead of compression
Answer:
a) Can process larger materials
Gyratory crushers are often used for primary crushing when handling very large material.
Question:
Mining crushers are equipped with safety features such as:
a) Sensors for high temperatures
b) Automatic lubrication systems
c) Overload protection and tramp release mechanisms
d) Secured bolts for raw material handling
Answer:
c) Overload protection and tramp release mechanisms
These features prevent damage to the crusher and ensure safety during operation.
This set of objective questions is designed to cover essential aspects of mining crushers, from types and functionalities to materials and safety mechanisms.
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