$(2\mathrm{.}5$ points$)$ T F Turns ratio can be determined directly from the voltages without the knowledge of the actual number of turns on the transformer windings.

$(2\mathrm{.}5$ points$)$ T F $6$ AWG copper conductor is larger than $4$ AWG aluminum conductor.

$(2\mathrm{.}5$ points$)$ T F Induction motors is the most common type, account for about $90\%$ of the existing motor mechanical power output.

$(2\mathrm{.}5$ points$)$ T F Circuit breakers are fail$-$safe devices.