A currency crisis occurs when a country can no longer support the price of its currency in foreign-exchange markets under a fixed-exchange-rate system.

One alternative to a currency crisis or to continuing to try to support a fixed exchange rate is to devalue unilaterally.

Yes. Both refers to the same.

Gujjula Yallamanda Reddy has written:

'Devaluations and general crisis of capitalism' -- subject(s): Devaluation of currency

'General crisis of capitalism and devaluations, inflation, monetary crisis' -- subject(s): Devaluation of currency, International finance

No, because too much currency would lower its value and increase inflation more