Description : The field arrangements in waveguides are divided into what two categories to describe the various modes of operation?
Last Answer : Transverse electric (TE) and transverse magnetic (TM).
Description : What are the two teletypewriter modes of operation?
Last Answer : Synchronous and nonsynchronous
Description : In 8096, mode ____ of serial port are ___ modes commonly used for ____ communications. a) 1, 8bit, single processor b) 0, 7bit, multiple microcontroller c) 2, 9 bit, multiple processors d) 3, 8 bit, multiple microcontroller
Last Answer : a) 1, 8bit, single processor
Last Answer : c) 2, 9 bit, multiple processors
Description : What four fiber properties determine the number of modes propagating in a multimode gradedindex fiber?
Last Answer : Numerical aperture (NA), relative refractive index difference ( D), profile parameter (α), and normalized frequency (V).
Description : Debunching of the electron bunches in the higher modes of a reflex klystron has what effect on output power?
Last Answer : Power is reduced.
Description : What are the transmitter operating modes?
Last Answer : Lsb, usb, isb, AM, cw, fsk.
Description : What are the tuning modes for the coupler group discussed?
Last Answer : Automatic, semiautomatic, and manual.
Description : A mode filter is a device that attenuates specific modes propagating in the core of an optical fiber. What mode propagating along single mode fibers do mode filters eliminate?
Last Answer : Second-order mode.
Description : Does underfilling a multimode optical fiber excite mainly high-order or low-order modes?
Last Answer : Low-order modes.
Description : Modes of a light pulse that enter the fiber at one time exit the fiber at different times. This condition causes the light pulse to spread. What is this condition called?
Last Answer : Modal dispersion.
Description : The number of modes propagated in a multimode fiber depends on core size and numerical aperture (NA). If the core size and the NA decrease, will the number of modes propagated increase or decrease?
Last Answer : Decrease.
Description : The fiber's normalized frequency (V) determines how many modes a fiber can support. As the value of V increases, will the number of modes supported by the fiber increase or decrease?
Last Answer : Increase.
Description : As the core and cladding modes travel along the fiber, mode coupling occurs. What is mode coupling?
Last Answer : Mode coupling is the exchange of power between two modes.
Description : Modes that are bound at one wavelength may not exist at longer wavelengths. What is the wavelength at which a mode ceases to be bound called?
Last Answer : Cutoff wavelength
Description : Low-order and high-order modes propagate along an optical fiber. How are modes determined to be low-order or high order modes?
Last Answer : Depends on the bending caused by the velocity difference of the wave traveling through different mediums
Description : What are modes of operation of electrical drives?
Last Answer : Steady state Acceleration including starting Deceleration including stopping
Description : What is centralized SPC, what are its modes of operation; explain the working of any one of these?
Last Answer : In centralized control, all the control equipment is replaced by a single processor which must be quite powerful. It must be capable of processing 10 to 100 calls per second, depending on ... The shared secondary storage need not be duplicated and simple unit level redundancy would suffice.
Description : In 8255, under the I/O mode of operation we have __ modes. Under which mode will have the following features i) A 5 bit control port is available. ii) Three I/O lines are available at Port C. a) 3, Mode2 b) 2, Mode 2 c) 4, Mode 3 d) 3, Mode 2
Last Answer : a) 3, Mode2
Description : Assume a two address format specified as source, destination. Examine the following sequence of instruction and explain the addressing modes used and the operation done in every instruction?
Last Answer : 1. Move (R5) +, R0 2. Add (R5) +, R0. 3. Move (R0), (R5) 4. Move 16(R5), R3 5. Add #40, R5
Description : With neat sketch explain four modes of operation of a TRIAC?
Last Answer : Modes of operation of a TRIAC: There are four different operating modes of TRIAC: 1) MT2 and gate are positive with respect to terminal MT1(Mode1) : Here terminal MT2 is positive ... junction P2-N2 is forward biased, current carriers are injected and therefore, the TRIAC is turned on.
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 : What are the two limitations to an active satellite communications system?
Last Answer : Satellite down-link transmitter power and up-link receiver sensitivity.
Description : What was the major operational limitation of early communications satellites?
Last Answer : The lack of suitable power sources.
Description : A typical satellite communications operational link consists of a satellite and what two other components?
Last Answer : Earth terminals.
Description : What are the two types of communications satellites?
Last Answer : Passive and active.
Description : What four switched networks are part of the defense communications system?
Last Answer : AUTOVON, AUTOSEVOCOM, AUTODIN, and DSSCS.
Description : The naval communications system is made up of what two groups of communications?
Last Answer : Strategic and tactical.
Description : What are the disadvantages of radiotelephone communications?
Last Answer : Static, enemy interference or a high local noise level.
Description : Why is radiotelephone one of the most useful methods of military communications?
Last Answer : It is direct, convenient and easy to use.
Description : What is the main advantage of radiotelegraph communications?
Last Answer : Reliability.
Description : What are the two types of electrical communications?
Last Answer : Radio and wire.
Description : What are the four general types of communications services in the hf band?
Last Answer : Point-to-point, ship-to-shore, ground-to-air, and fleet broadcast.
Description : What are the three fundamental requirements of a military communications system?
Last Answer : Reliability, security, and speed.
Description : The transmission of still images over an electrical communications system is known as what?
Last Answer : Facsimile.
Description : What type of modulation do most analog fiber optic communications systems use?
Last Answer : Intensity modulation.
Description : A law that specifically requires the service of a duly registered electronics and communications engineer in the designing installation and construction, operation and maintenance of radio stations. A. Act 3846 B. LOl 1000 C. R.A. 5734 D. Dept. order 88
Last Answer : D. Dept. order 88
Description : One of the first satellite system catering personal based communications services scheduled for operation. A. Iridium system B. Plutonium system C. Indium system D. Gallium system
Last Answer : A. Iridium system
Description : A radio communications service use in radio regulation between specified fixed points provided primarily for the safety of air navigation and for the regular efficient and economical air transport ... operation service B. Space service C. Aeronautical mobile service D. Aeronautical fixed service
Last Answer : D. Aeronautical fixed service
Description : Information Technology is operation through applied technologies of computer science through and medium of electronic communications like A. TV B. Telephone C. Internet D. All of the above
Last Answer : D. All of the above
Description : What amplifier class of operation is the most inefficient but has the least distortion?
Last Answer : Class A.
Description : What two primary items determine the class of operation of an amplifier?
Last Answer : The amount of bias and the amplitude of the input signal
Description : Once ionization has occurred in a thyratron, what control does the control grid have over the tube’s operation?
Last Answer : None.
Description : What type of clock is used when more than one operation is to be completed during one clock cycle?
Last Answer : . A multiphase clock.
Description : What is the sign of operation for the X-OR gate?
Last Answer : XOR
Description : What is the key to FET operation?
Last Answer : Effective cross-sectional area of the channel.
Description : What type of bias is required for proper operation of a photodiode?
Last Answer : Reverse bias.
Description : The TRIAC is similar in operation to what device?
Last Answer : SCR
Description : What type of diagram is the most useful in learning the overall operation of a system?
Last Answer : A schematic diagram.
Description : What is the effect on magnetron operation if the magnetic field strength is too high?
Last Answer : The magnetron will not oscillate.