Electrical Machine Design

2 ✘ -2 ✘

Palladium ✘ Lead ✘ Pure iron ✘ All of the above. ✔

Pure iron ✘ Lead ✘ Bismuth ✘ Water ✔

Nickel ✘ Bismuth ✘ Silicon ✘ Mild steel. ✔

Iron ✘ Lead ✘ Air ✘ Water ✔

Copper: Silver

✘

Air: Water

✘

Iron: Steel

✘

Lead: Cobalt.

✔

Water, Iron. Copper, Silver ✘ Water, Air, Pure iron. Permalloy ✘ Cobalt, Aluminium, Copper, Silver ✘ Silicon iron. Palladium, Lead, Silver. ✔

electrical resistivity increases and also magnetic permeability increases ✘ electrical resistivity decreases and also magnetic permeability increases ✘ electrical resistivity decreases and magnetic permeability increases ✘ electrical resistivity increases and magnetic permeability decreases. ✔

Mild steel ✘ Silicon iron ✘ Cold rolled silicon steel ✘ Hot rolled silicon steel ✔

cold rolling ✘ magnetic annealing ✘ magnetic quenching ✘ any of the above. ✔