How to know if questions in an exam mean line, phase, or RMS voltage?
On AC power questions, unless otherwise specified the default measurement is RMS.

On 3ph power questions, unless otherwise specified the default voltage is always line-voltage\$^1\$.

Phase voltage is between any of the 3 power-conductors and a neutral wire (as per star connected loads. Line voltage is between 2 of the 3 power-conductors and, for a balanced load, this will be \$\sqrt3\$ times higher than phase voltage.

RMS is the preferred method of measurement.



\$^1\$ Except in aerospace where phase voltage is always the default.