__________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?
Correct answer: D. Cast iron
- A. Cast steel
- B. Aluminium
- C. Soft steel
- D. Cast iron
Explanation
Cast iron has comparatively low permeability, but it is inexpensive and mechanically strong; its greater weight is acceptable when cost matters more than mass. Cast steel and soft steel provide better magnetic performance.
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