Answer to Question 1
high contrast
Rationale: High scale or short contrast is a scale of contrast with greater differences between the shades, making the contrast scale more black and white.
Answer to Question 2
reduce or eliminate the need for repeat projections
Rationale: The best means to reduce exposure would be to reduce the number of repeat radiographs on a patient. In addition, good communication and technical considerations such as technique paired with image receptors.