In a power-system, the $$3$$-phase fault MVA is always higher than the single-line-ground fault MVA at a bus (State True or False)

HVDC transmission is preferred to EHV __ AC because

If $$f(t)$$ is the step-response of a linear time-invariant system, then its impulse response is given by ___________

The value of the integral $$\int_{-5}^{+6}e^{-2t}\delta\left(t-1\right)dt$$ is equal to ________.