Description : Which technology uses miniaturized accelerometers and gyroscopes? a) Sensors b) Actuators c) MEMS d) None of the mentioned
Last Answer : c) MEMS
Description : The accelerometers are commonly used in vibration measurement due to their ___________. (A) small size and low sensitivity (B) the large size and high sensitivity (C) the large size and low sensitivity (D) small size and high sensitivity
Last Answer : (D) small size and high sensitivity
Description : Which of the following vibro-meters have frequency ratio (ω/ω n )
Last Answer : A. Accelerometers
Description : Hybrid rings are used primarily for what purpose?
Last Answer : High-power duplexes.
Description : The SCR is primarily used for what function?
Last Answer : The SCR is primarily used for switching power on or off.
Description : The Navy uses analog computers primarily for what purpose?
Last Answer : Gun fire control
Description : The pin diode is primarily used for what purpose?
Last Answer : A switching device.
Description : What are rate gyros primarily used for?
Last Answer : Measuring angular rates.
Description : Boolean algebra is used primarily by _______ to simplify circuits.
Last Answer : Design engineers.
Description : Real_time operating systems (a) are primarily used on mainframe computers (b) can respond quickly to an event (c) are used for program development -Technology
Last Answer : (b) Real-time operating systems can respond more quickly or predictably to an event than any other OS.
Description : Which operating systems is used primarily for networks?
Last Answer : Windows
Description : What type of modulation do most analog fiber optic communications systems use?
Last Answer : Intensity modulation.
Description : What type of synchro is used in systems requiring large amounts of power and a high degree of accuracy?
Last Answer : A control synchro.
Description : What type of receiver is most often used in radar systems?
Last Answer : Superheterodyne.
Description : What type of modulator is most commonly used in modern radar systems?
Last Answer : Line-pulsed.
Description : What type of applications were most third generation computer systems designed to accomplish?
Last Answer : Both scientific and business data processing applications.
Description : What type of interface electronics is used in many naval electronic warfare systems?
Last Answer : NTDS interface.
Description : Most shipboard distribution systems use ac power that has what number of phases?
Last Answer : Three.
Description : LEDs operating at 850 nm provide sufficient optical power for short-distance, low-bandwidth multimode systems. List three conditions that prevent the use of LEDs in longer distance, higher bandwidth multimode systems.
Last Answer : Multimode fiber dispersion, the relatively high fiber attenuation, and the LED's relatively low optical output power.
Description : What is the most likely cause of losses in waveguide systems?
Last Answer : Improperly connected joints or damaged inner surface.
Description : Name the two general classifications of synchro systems
Last Answer : Torque and control.
Description : What types of operating systems let more than one user access the same resources at the same time?
Last Answer : Multiuser/multitasking.
Description : Which types of operating systems are the simplest and most common on microcomputers?
Last Answer : Single user/single tasking.
Description : What are the three relatively common classifications of servo systems by function?
Last Answer : Classifications in accordance with position, velocity, and acceleration functions.
Description : Which types of LEDs are the preferred optical sources for short-distance, low-data-rate fiber optic systems?
Last Answer : SLEDs and ELEDs.
Description : Why can multimode graded-index fiber 1300-nm systems using LEDs operate over longer distances and at higher bandwidths than 850-nm systems?
Last Answer : Longer distances and higher bandwidths are possible because fiber material losses and dispersion are significantly reduced at the 1300-nm region.
Description : Why is detector saturation not generally a problem in fiber optic communications systems?
Last Answer : Because fiber optic communications systems operate at low optical power levels.
Description : List the two principal optical detectors used in fiber optic systems.
Last Answer : The semiconductor positive-intrinsic-negative (PIN) photodiode and avalanche photodiode (APD).
Description : Which performance parameter is the minimum amount of optical power required to achieve a specific bit-error rate (BER) in digital systems or a given signal-to-noise ratio (SNR) in analog systems?
Last Answer : Receiver sensitivity.
Description : How many systems dealing with accounting applications have been widely accepted?
Last Answer : Six.
Description : What term is used for programs such as assemblers, compilers, and operating systems?
Last Answer : Software.
Description : What does each generation of computer systems indicate?
Last Answer : Significant change in computer design.
Description : What test equipment continuously monitors electronic systems?
Last Answer : On-line.
Description : What problems were evident about military electronic systems during World War II?
Last Answer : Size, weight, and power consumption.
Description : What are the two basic types of tape buffering reeling systems?
Last Answer : a. Spring-tension buffering systems. b. Vacuum-column buffering systems.
Description : What are the three most commonly used tape reeling systems?
Last Answer : a. Take-up control. b. Two-motor reeling. c. Tape buffering.
Description : What are four types of tape errors that can degrade a magnetic recording system’s performance?
Last Answer : Signal dropout, noise, skew, and level. Dropout is the most common.
Description : Compare the power sources of synchros and step transmission systems.
Last Answer : Synchros use ac; step transmission uses dc.
Description : List five precautions to take when installing fiber optic systems on board naval ships.
Last Answer : a. Never bend an optical fiber or cable at a radius of curvature less than the minimum bend radius. b. Never pull fiber optic cables tight or fasten them over or through sharp corners or ... the hardware. e. Allow only trained, authorized personnel to install or repair fiber optic systems.
Description : Modal dispersion affects the bandwidth of multimode systems. It is essential to adjust what three fiber properties to maximize system bandwidth?
Last Answer : Core diameter, NA, and index profile properties.
Description : List seven advantages of fiber optics over electrical systems.
Last Answer : Advantages of fiber optics are improved system performance, immunity to electrical noise, signal security, electrical isolation, reduced size and w
Description : In fiber optic systems, designers consider what trade-offs?
Last Answer : Trade-offs in fiber properties, types of connections, optical sources, and detector types in military and subscriber-loop applications.
Description : What is the primary advantage of pulse-modulation systems?
Last Answer : . Low susceptibility to noise.