1.
Cameras are able to do which of the following?
Correct Answer
D. All of the above.
Explanation
Cameras can do all of these based on the size of the image in the viewing area and the analytics available.
2.
Which of the following camera lens sizes will produce the widest angle image?
Correct Answer
A. 1 in. CCD
Explanation
The size of the camera lens determines the angle of view, with larger lenses producing wider angles. Therefore, the 1 in. CCD camera lens will produce the widest angle image compared to the 2/3 in., 1/2 in., and 1/3 in. CCD camera lenses.
3.
A ______ lens will produce the largest distorted image.
Correct Answer
D. Fisheye
Explanation
A fisheye lens creates a distorted circular image.
4.
The field of view is ______.
Correct Answer
B. The horizontal and vertical area that the camera is supposed to be seeing.
Explanation
The correct answer is "the horizontal and vertical area that the camera is supposed to be seeing." This refers to the extent of the scene that the camera can capture, both horizontally and vertically. It determines the amount of the scene that will be visible in the resulting image or video. The field of view is not the same as the focal length, which is a specific property of the camera lens. It is also not solely dependent upon the size of the camera "chip" or calculated by determining the distance of the imager to the front of the camera lens.
5.
Professional photography lenses are interchangeable with CCTV designed lenses and produce a better quality image, but the cost is very high.
Correct Answer
B. False
Explanation
Professional camera lenses are not interchangeable with CCTV cameras.
6.
Depth of field is ______.
Correct Answer
B. Determined by the amount of light entering the lens.
Explanation
Depth of field refers to the range of distance in an image that appears to be in focus. It is determined by various factors, including the aperture setting, focal length, and the distance between the camera and the subject. The amount of light entering the lens, which is controlled by the aperture setting, is one of the key factors that determine the depth of field. Therefore, the correct answer is that the depth of field is determined by the amount of light entering the lens.
7.
The cost of color cameras is so prohibitive that most videos from locations such as convenience stores are black and white.
Correct Answer
B. False
Explanation
The statement suggests that the cost of color cameras is the reason why most videos from places like convenience stores are black and white. However, this is not true. The main reason why videos from these locations are often black and white is because black and white cameras are more commonly used due to their lower cost and simplicity. Color cameras are available and used in many locations, but they are not as prevalent in convenience stores and similar places due to cost considerations.
8.
When transmitting video over the Internet, which of the follow is true?
Correct Answer
C. The more cameras, the more bandwidth is needed.
Explanation
The more cameras that are being viewed, the more data needs to be transmitted over the Internet. Each camera requires a certain amount of bandwidth to transmit its video feed, so as the number of cameras increases, the overall bandwidth needed also increases. This is because more data needs to be transmitted simultaneously to accommodate the video feeds from multiple cameras. Therefore, the statement "The more cameras, the more bandwidth is needed" is true in the context of transmitting video over the Internet.
9.
Using a lens with higher quality glass elements will produce better images.
Correct Answer
A. True
Explanation
Using a lens with higher quality glass elements can improve the overall image quality. High-quality glass elements are designed to minimize optical aberrations such as distortion, chromatic aberration, and vignetting. They also have better light transmission, resulting in sharper and more detailed images. Additionally, high-quality lenses often have better build quality and advanced coatings that reduce flare and ghosting. Therefore, using a lens with higher quality glass elements can indeed produce better images.
10.
Cameras are just one component of a complete integrated security solution.
Correct Answer
A. True
Explanation
The statement is true because cameras are not the only aspect of a comprehensive security system. While cameras play a crucial role in capturing and monitoring activities, they need to be integrated with other elements such as alarms, access control systems, and monitoring software to create an effective security solution. These additional components provide enhanced security measures, such as real-time alerts, remote monitoring, and access management, which complement the capabilities of cameras and ensure a comprehensive approach to security.
11.
Fill in the blanks: ______ lux = ______ footcandles.
Correct Answer
C. 1 / 0.093
Explanation
The correct answer is 1 / 0.093. This is because 1 lux is equal to 0.093 footcandles.
12.
Which of the following provide the greatest percentage of reflectivity?
Correct Answer
B. Snow
Explanation
Snow reflects between 85-95 percent of visible light; aluminum and plaster reflect about 90 percent.
13.
The following are all types of high-intensity discharge lamps except
Correct Answer
E. All are high-intensity discharge lamps
Explanation
The given correct answer is "All are high-intensity discharge lamps." This means that all of the options mentioned in the question (mercury, xenon, metal-arc, and sodium) are types of high-intensity discharge lamps. Therefore, none of them can be excluded as types of high-intensity discharge lamps.
14.
The Inverse Square Law states that an object
Correct Answer
B. That is twice the distance from the source will receive one quarter the amount of illumination.
Explanation
The Inverse Square Law states that the intensity of illumination decreases as the distance from the source increases. Specifically, it states that an object that is twice the distance from the source will receive one quarter (1/4) the amount of illumination. This means that the farther the object is from the source, the less light it will receive.
15.
Calculating field of view and angle of views all require understanding
Correct Answer
C. Triangles.
Explanation
The Pythagorean theorem is one of the most used formulas in CCTV design.