Description : What type of synchros usually require the use of synchro capacitors?
Last Answer : TDXs, CDXs, and Cts.
Description : What are the three types of control synchros?
Last Answer : CX, CT, and CDX.
Description : What are the two types of differential synchros?
Last Answer : The TDX and the TDR.
Description : What is the purpose of using differential synchros instead of regular synchros?
Last Answer : Differential synchros can handle more signals than regular synchros and also perform addition and subtraction functions.
Description : What type of equipment normally uses 26-volt 400-hertz synchros?
Last Answer : . Aircraft.
Description : Where are the external connections made on standard synchros?
Last Answer : At the terminal board.
Description : Using table 1-1, name two synchros that provide a mechanical output.
Last Answer : The torque receiver (TR) and the torque differential receiver (TDR).
Description : What two characteristics of IC synchros cause them to differ from standard synchros?
Last Answer : Direction of rotation and amount of torque.
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 : Sources of impulse noise induced in communication channels. A. Erroneous digital coding bit caused by an error on a transmission facility B. Transients due to relay operation C. Crosstalk from dc signaling systems D. All of these
Last Answer : D. All of these
Description : What is Synchros?
Last Answer : Synchros is a device used to convert an angular motion to an electrical signal or vice versa.
Description : Which semiconductor sources (LD or LED) emit more focused light and are capable of launching sufficient optical power into both single mode and multimode fibers?
Last Answer : LDs.
Description : What meters operate from their own power sources?
Last Answer : Self-excited.
Description : All the power sent down a transmission line from a transmitter can be transferred to an antenna under what optimum conditions?
Last Answer : When the characteristic impedance of the transmission line and the load impedance are equal.
Description : To measure incident power, you must rotate the coupler detector of the wattmeter so that the arrow indicating power flow points toward which end of the transmission line?
Last Answer : Load.
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 : 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 : 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 : Three phase step-up transformer installed at power house, just before commencement of transmission line, have:
Last Answer : Three phase step-up transformer installed at power house, just before commencement of transmission line, have: star delta connections
Description : Motors, switches, voltage regulators, generators, etc., are a few examples of emi sources. What type of emi comes from these sources?
Last Answer : Man-made.
Description : Thunderstorms, snowstorms, cosmic sources, the sun, etc., are a few examples of emi sources. What type of emi comes
Last Answer : Natural.
Description : What are the two main sources of emi with which radio waves must compete?
Last Answer : Natural and man-made interference.
Description : What are four sources that can cause magnetic heads to become magnetized?
Last Answer : a. During ac power losses. b. During testing. c. Because of stray magnetic fields. d. From normal use.
Description : Microbend loss is caused by microscopic bends of the fiber axis. List three sources of microbend loss.
Last Answer : Uneven coating applications, improper cabling procedures, and external force.
Description : Compare conventional energy sources with renewable energy sources on any four points.
Last Answer : Points Conventional Energy Sources Renewable Energy Sources Availability Limited Unlimited Cost of Fuel High depending on fuel. Negligible Amount of Power generated On large scale due ... should be selected at source For example HPP, TPP, NPP SPP and WPP
Description : Which of the following is the first step in starting the research process? (i) Searching sources of information to locate problem. (ii) Survey of related literature (iii) Identification of problem (iv) Searching for solutions to the problem
Last Answer : (ii) Survey of related literature
Description : Which of the following is the first step in starting the research process? (A) Searching sources of information to locate problem. (B) Survey of related literature (C) Identification of problem (D) Searching for solutions to the problem
Last Answer : (C) Identification of problem
Description : Explain reactive power compensation in Transmission and Distribution systems.
Last Answer : Reactive power compensation in Transmission and Distribution systems: The reactive power is present in lines due to the reactive loads and device/ component reactances. This leads to heavy ... Diagram shows a scheme of reactive power compensation used in transmission and distribution systems.
Description : What symbol is used to designate the characteristic impedance of a line, and what two variables does it compare?
Last Answer : Z0 and it is the ratio of E to I at every point along the line.
Description : Compare the resistance of a conductor to that of an insulator.
Last Answer : Conductors have a very low resistance and insulators have a resistance that is so great that, for all practical purposes, they are nonconductors.
Description : Information systems can assist managers by _______ 1. Providing information 2. Providing data on internal sources 3. Directing 4. All of the above 5. None of these
Last Answer : All of the above
Description : What is the difference between a positive counter and a step counter?
Last Answer : The load resistor in a positive counter is replaced by a capacitor in a step counter.
Description : Does 1:5 indicate a step-up or step-down transformer?
Last Answer : Step up.
Last Answer : Step up
Description : What radar scope uses a range step for range measurement?
Last Answer : The A scope.
Description : If you are required to monitor the speed of a device with a stroboscope over an extended period of time, what step should be taken to prolong the life of the flasher tube?
Last Answer : Monitor a submultiple frequency to prolong the flasher-tube life.
Description : Reduction of Fresnel reflection is possible by reducing the step change in the refractive index at the fiber interface. What material reduces the step change in refractive index at a fiber interface?
Last Answer : Index matching gel.
Description : What are the two basic types of single mode step-index fibers?
Last Answer : Matched-clad and depressed-clad.
Description : Multimode step-index fibers have relatively large core diameters and large numerical apertures. These provide what benefit?
Last Answer : Make it easier to couple light from a light-emitting diode (LED) into the fiber.
Description : In multimode step-index fibers, the majority of light propagates in the fiber core for what reason?
Last Answer : Most modes in multimode step-index fibers propagate far from cutoff.
Description : Multimode step-index fibers have a core and cladding of constant refractive index n1 and n2, respectively. Which refractive index, the core or cladding, is lower?
Last Answer : Cladding.
Description : List the standard core sizes for multimode step-index, multimode graded-index, and single mode fibers
Last Answer : Multimode step-index fibers: 50µm and 100µm. Multimode graded-index fibers: 50µm, 62.5µm, 85µm, and 100µm. Single mode fibers: between 8µm and 10µm.
Description : Multimode optical fibers can have a step-index or graded index refractive index profile. Which fiber, multimode step-index or multimode graded-index fiber, usually performs better?
Last Answer : Multimode graded-index fiber
Description : The refractive index of a fiber core is uniform and undergoes an abrupt change at the corecladding boundary. Is this fiber a step-index or graded-index fiber?
Last Answer : graded-index fiber?
Description : A step transmitter is a modification of what electrical device?
Last Answer : Rotary switch.
Description : The final step in the marketing control process is to A)take corrective action. B)establish performance standards. C)evaluate actual performance. D)compare actual performance and standards. E)reduce the difference between actual and desired standards.
Last Answer : E)reduce the difference between actual and desired standards.
Description : The first step in the marketing control process is to A)take corrective action. B)establish performance standards. C)evaluate actual performance. D)compare actual performance and standards. E)reduce the difference between actual and desired standards.
Last Answer : B)establish performance standards.
Description : . Why are coaxial lines more efficient at microwave frequencies than two-wire transmission lines?
Last Answer : The electromagnetic fields are completely confined