Description : The electron beam in a CRT is made to sweep from left to right across the screen. What tube element causes this sweeping motion?
Last Answer : The horizontal-deflection plate.
Description : Beam-forming tubes and power tubes are similar except that power pentodes lack what element?
Last Answer : Beam-forming plates.
Description : True statements about the pupil include: a. it is controlled mainly by the autonomic system b. miosis increases the depth of focus for near vision c. a change in the pupil diameter from 2 to 8 mm increases the amount of light entering the eye by 16- fold d. all above
Last Answer : all above
Description : Using a standard microscope to inspect a fiber-end face, you observe that all parts of the fiberend face are in focus at the same time. Is the fiber-end face flat, concave, or convex?
Last Answer : Flat.
Description : How does a waveguide-type lens focus spherical wavefront microwave energy?
Last Answer : Some wavefronts are accelerated so that all wavefronts exit the lens at the same time
Description : What type of MOSFET can be independently controlled by two separate signals?
Last Answer : The dual-gate MOSFET.
Description : Why do cable manufacturers introduce a controlled twist to the stacked ribbons during the cabling process?
Last Answer : To minimize fiber stress when the cable is bent
Description : How is output voltage controlled in practical alternators?
Last Answer : By varying the voltage applied to the field windings.
Description : Is the deflection angle greater when the beam is moving faster or slower?
Last Answer : Slower beam.
Description : What effect does closer spacing of plates have on the electron beam?
Last Answer : A greater deflection angle.
Description : Scopes that produce two channels on a single CRT with a single beam are referred to as what types of scopes?
Last Answer : Dual-trace oscilloscopes.
Description : What effect do longer deflection plates have on the electron beam?
Description : What effect does the shielding of the screen grid by the control grid have on plate current in beam-forming tetrodes?
Last Answer : By increasing the number of electrons that reach the plate, plate current is increased.
Description : If a target is on the bearing axis of the radiated beam, what is the input to the bearing IF channel?
Last Answer : Zero.
Description : What type of deflection is preferred for a crt electron beam?
Last Answer : . Electromagnetic.
Description : Which beam of missile-guidance radar is very wide?
Last Answer : Capture beam.
Description : Fire-control tracking radar most often radiates what type of beam?
Last Answer : A narrow circular beam.
Description : What is the shape of the beam of a surface-search radar?
Last Answer : Wide vertically, narrow horizontally.
Description : Is coupling loss from angular misalignment more critical in expanded beam or butt-jointed connectors?
Last Answer : Expanded beam connectors.
Description : Is coupling loss from fiber separation and lateral misalignment more critical in expanded-beam or butt-jointed connectors?
Last Answer : Butt-jointed connectors.
Description : Which type of fiber optic connector (butt-jointed or expanded beam) brings the prepared ends of two optical fibers into close contact?
Description : What relationship must exist between the electron beam and the traveling wave for bunching to occur in the electron beam of a twt?
Last Answer : The traveling wave must have a forward velocity equal to or less than the speed of the electrons in the beam.
Description : How is the electron beam of a three-cavity klystron accelerated toward the drift tube?
Last Answer : A large negative pulse is applied to the cathode.
Description : The electrons in the beam of a klystron are speeded up by a high dc potential applied to what elements?
Last Answer : The accelerator grid and the buncher grids.
Description : How is a beam of electrons velocity-modulated?
Last Answer : By alternately speeding up or slowing down the electrons
Description : What determines the beam elevation angle of an antenna that is electronically scanned in elevation?
Last Answer : Frequency or phase of radiated energy.
Description : The beam from a horizontally positioned cylindrical paraboloid is narrow in what plane?
Last Answer : . Vertical.
Description : What is the term that is used to describe narrowness in the radiated beam of an antenna?
Last Answer : Antenna directivity.
Description : Name two advantages of the gated-beam detector.
Last Answer : Extreme simplicity, few components, and ease of adjustment.
Description : What condition must exist on both the limiter and quadrature grids for current to flow in a gated-beam detector?
Last Answer : Both grids must be positively biased
Description : What circuit functions does the tube in a gated-beam detector serve?
Last Answer : Limits, detects, and amplifies.
Description : What is the usual electrical length of a driven element in an HF beam antenna? A. ¼ wavelength B. ¾ wavelength C. ½ wavelength D. 1 wavelength
Last Answer : C. ½ wavelength
Description : For a beam having fixed ends, the unknown element of the reactions, is (A) Horizontal components at either end (B) Vertical components at either end (C) Horizontal component at one end and vertical component at the other (D) Horizontal and vertical components at both the ends
Last Answer : (D) Horizontal and vertical components at both the ends
Description : If current gain is required from an rf amplifier, what type of component should be used as an output coupling element?
Last Answer : A step-down transformer.
Description : What element controls the number of electrons striking the screen?
Last Answer : Control grid.
Description : In applications where electronic waveforms are displayed on a CRT screen, the input signal is normally applied to what CRT element?
Last Answer : The vertical-deflection plate.
Description : A, what logic element enables FF3 to toggle with the clock?
Last Answer : The AND gate
Description : . In a MOSFET, which element is insulated from the channel material?
Last Answer : The gate terminal.
Description : The base of a transistor serves a purpose similar to what element of the FET
Last Answer : Gate.
Description : . In a common anode, seven-segment LED display, an individual LED will light if a negative voltage is applied to what element?
Last Answer : The cathode.
Description : What is the fundamental element in program preparation?
Last Answer : The instruction.
Description : What is the smallest particle into which an element can be broken down and still retain all its original properties?
Last Answer : The atom.
Description : What modulator element controls the rate at which the storage element charges?
Last Answer : The charging impedance.
Description : What type of tube best meets the requirements of a modulator switching element?
Last Answer : Thyratron.
Description : What element in the magnetron causes the curved path of electron flow?
Last Answer : The permanent magnet.