What is the numerical aperture of a light source?
What will be an ideal response?
The numerical aperture (NA) is a measure of the angle at which light is emitted from the source. If the NA of the source is too wide, it can overfill the NA of the optical fiber. If the NA of the source is too small, it will underfill the fiber. A low-NA light source helps reduce losses in both the optical fiber and at connection points.
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A. Front height sensor B. Rear height sensor C. Rear chassis position sensor D. Yaw rate sensor
Which of the following is NOT a type of frame construction?
a. balloon b. prestressed c. platform d. braced
Elevator and stair shafts in building cores are often constructed by using a type of _____.
a. sliding form b. climbing form c. slip form d. jack-raised form
Technician A says that an advantage of EHIs over standard hydraulic injectors, is the absence of injection lag. Technician B says that EHIs are capable of multipulse injections within a single cycle. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B