Show your work/understanding to get full credit on exam:
List assumptions if used, inputs/outputs, known/unknowns, etc.
Give references and label quantities, equations, etc.
Sketch "hardware" and/or process diagrams with the same labeling used in equations whenever possible.
Comment your results if appropriate.
Make a point, state important facts,
but avoid ineffective (confusing) explanation
(key-wording and labeling only, NOT story-telling).
Brevity and clarity will be grades along with the rigor/accuracy of your statements.