Why a signal with finite energy has zero power.secondly also explain why a ramp signal is neither a power?

Question

signal nor An energy signal

Answer 1

huh?

All wrong.

A "signal", a voltage with energy has power. The two terms are related by time, so a signal with 1 mW of power has 1 mJoule per second, with the mJoule being the energy.

A ramp is just a waveform, a voltage waveform. It can be a signal, depending on how it is to be used. It also has power and energy, as explained above, as long as it has a voltage across a resistance.