12. Which of the following statements about ground detectors for systems that are permit. ted to operate ungrounded is not true?
a. Ground detectors are permitted to consist of a system of lamps (light bulbs).
b. Ground detectors are intended to indicate that one phase has become grounded.
c. Ground detectors are available as listed equipment. abban
d. Ground detectors must report the occurrence to a remote location.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj