Which of the following is a primary crusher commonly selected for hard and tough stones?

Introduction / Context:
Primary crushers handle the largest feed sizes. For hard, tough rock, robust compressive crushers are required at the first stage.

Given Data / Assumptions:

• Tough, hard stone feed.
• Primary stage selection.

Concept / Approach:
Jaw and gyratory crushers are the classic primary machines. Among the options provided, the jaw crusher is the most commonly specified for hard, tough stones in quarries due to simplicity, ruggedness, and ability to accept large feed with high reduction ratios. Cone crushers are used more often in secondary/tertiary stages.

Step-by-Step Solution:
Identify primary duty device: jaw/gyratory.From given choices, jaw is the standard selection.

Verification / Alternative check:
Quarry flowsheets typically start with a jaw (or gyratory) before cones.

Why Other Options Are Wrong:
Cone: usually secondary/tertiary.Gyratory could also be primary but is not the expected answer set here.

Common Pitfalls:
Assuming cone equals gyratory; while related, cones are typically downstream of the primary.

Final Answer:
Jaw crusher