Which of the following refers to a radiographic image that is black and white with many shades of gray in between?
a. Low contrast
b. High contrast
c. Low density
d. High density
a. The term "low contrast" (also called "long-scale contrast") describes a radiograph in which the density differences between adjacent areas are small. The contrast is low and very gradual because there are many shades of gray.
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Which of the following statements BEST describes standpipe and hose systems?
A. Standpipe systems may not be effective on small fires in their early stages. B. Standpipe systems normally discharge water outside of the protected building. C. Design and installation of standpipe systems and hose stations are described in NFPA® 13 and NFPA® 14. D. Standpipe system components commonly include a control panel, alarm actuator, cross mains, and an inspector's test valve.
Which of the following BEST describes the location of an escalator's manual stop switch?
A. Next to the closest exit door B. On a handrail at the top of the unit C. In an equipment room located in the building D. On nearby wall or handrail at top or bottom of unit
In Volume I of the ICD-9-CM, the number in parentheses refers to:
a. the page number in Volume II. b. the page number in Volume III. c. the page number in the index. d. the page number of the appendix.
Which type or class of fire involves combustible metals?
A) A B) B C) C D) D