Description : Could rail gun technology be used to decelerate an object?
Last Answer : I think it is recognized as the technology of choice for atmosphere free low gravity launches from places like our moon. But the difficulties involved with accurately “catching” an object moving at interplanetary speeds seem impractical to me.
Description : Why are the electrostatic fields between the electron gun elements called lenses?
Last Answer : Because they bend electron streams in much the same manner that optical lenses bend light rays.
Description : An electron gun emits `2.0xx10^(16)` electrons per second. What is the associated current ?
Last Answer : An electron gun emits `2.0xx10^(16)` electrons per second. What is the associated current ?
Description : Which of the following statement(s) is/are correct? (1) Persistence is the term used to describe the duration of phosphorescence. (2) The control electrode is used to turn the electron beam on and off. (3) ... which are focussed into a narrow beam directed at the face of CRT. (4) All of the above.
Last Answer : All of the above.
Description : If a 99.79 kg man jumps from the top of a 176.8 meter tall building how long does it take for his body to decelerate to 0 ms once first contact with the ground is made?
Last Answer : It depends upon how much the ground deforms once the first bit of his body hits the ground, and how much his body deforms once the first bit of his body has hit the ground. The former is likely to be ... his body). It will be any time greater than 0 seconds, the the amount of time depends as above.
Description : The constant-speed electrons of an electron bunch in a reflex klystron must remain in the repeller field for what minimum time?
Last Answer : Three-quarter cycle.
Description : A moderator is used in nuclear reactor in order to ? A. Accelerate the neutrons B. Slow down the speed of the neutrons (Answer) C. Increase the number of elections D. Decrease the number of electrons E. None of these
Last Answer : B. Slow down the speed of the neutrons (Answer)
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 : What element in the magnetron causes the curved path of electron flow?
Last Answer : The permanent magnet.
Description : Explain why the water molecule has a bent shape and a bond angle less than 109.5° The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Last Answer : The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Description : The interaction between an external field and the binding force of an atom causes electrons to do what?
Last Answer : Wobble at a natural resonant frequency.
Description : What causes dc bias energy to be absorbed by avalanche electrons and given up to the microwave field applied to an avalanche transit-time diode?
Last Answer : The negative-resistance property.
Description : What is the mass of an object if a net force of 8.0 N causes it to accelerate at 1.1 MS?
Last Answer : Need answer
Description : Which of the following is exposed on the outer surface of a gram-negative bacterium?A- O-antigen of lipopolysaccharide (LPS) B- Polysaccharide portion of lipoteichoic acid (LTA) C- Braun lipoprotein D- .Electron transport system components
Last Answer : O-antigen of lipopolysaccharide (LPS)
Description : Which portion of a sine-wave input is retained in the output of a series-negative limiter?
Last Answer : Positive.
Description : Which portion of a sine-wave input is retained in the output of a series-positive limiter?
Last Answer : Negative.
Description : In the subtract mode, a 1 at C0 performs what portion of the R’s complemen
Last Answer : Add 1 portion.
Description : In the subtract mode, which portion of the problem is complemented?
Last Answer : Subtrahend.
Description : At what portion of the magnetization curve should a magnetic amplifier be operated?
Last Answer : . The knee of the curve.
Description : If a wire passes through a connector what portion of the aircraft wire identification number changes?
Last Answer : Wire segment letter.
Description : Magnetron tuning by altering the surface-to-volume ratio of the hole portion of a hole-and-slot cavity is what type of tuning?
Last Answer : Inductive.
Description : What type of lens decelerates a portion of a spherical wavefront
Last Answer : Delay lens
Description : Vacuum tubes are designed to operate in what portion of the Ep - Ip
Last Answer : The linear portion.
Description : If one branch of a parallel network is shorted, what portion of circuit current flows through the remaining branches?
Last Answer : None.
Description : What is the effect on total resistance and total current in a circuit if a short occurs in (a) a parallel branch, and (b) in a series portion?
Last Answer : (a) Total resistance decreases, total current increases (b) Total resistance decreases, total current increases
Description : What is the effect on total resistance and total current in a circuit if an open occurs in (a) a parallel branch, and (b) in a series portion?
Last Answer : (a) Total resistance increases, total current decreases (b) Total resistance becomes infinite, total current is equal to zero
Description : Ideally, an oscilloscope presentation should cover what vertical portion of the screen?
Last Answer : At least 60% of the vertical trace.
Description : Electron are emitted from an electron gun at almost zero velocity and are accelerated by an electric field `E` through a distance of `1.0m` The electr
Last Answer : Electron are emitted from an electron gun at almost zero velocity and are accelerated by an electric field ... .5 nm` may be emitted by the hydrogen?
Description : Which of the following is not a part of a CRT? (1) Phosphor screen (2) Shadow mask (3) Electron gun (4) Gas plasma
Last Answer : (4) Gas plasma Explanation: The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons or electron emitter) and a fluorescent screen used to view images. Colour tubes ... stripes (as in aperture grille designs) or clusters called "triads" (as in shadow mask CRTs).
Description : A circuit which develops voltage across the horizontal deflection plates is known as a) Time base generator b) Electron gun c) Thermionic diode d) Zener diode
Last Answer : a) Time base generator
Description : Which of the following is/are the components of a CRT ? (a) Electron Gun (b) Control Electrode (c) Focusing Electrode (d) Phosphor Coated Screen Codes : (A) (a) and (d) (B) (a), (b) and (d) (C) (a), (b), (c) and (d) (D) (a), (c) and (d)
Last Answer : (C) (a), (b), (c) and (d)
Description : Which of the following is not a part of a CRT ? (1) Phosphor screen (2) Shadow mask (3) Electron gun (4) Gas plasma
Last Answer : Gas plasma
Description : In a CRO which of the following is not a part of electron gun: (1) Cathode (2) Grid (3) Accelerating anode (4) X–Y plates
Last Answer : In a CRO which of the following is not a part of electron gun: X–Y plates
Description : A soldering gun should NOT be used on what components?
Last Answer : Electronic components, such as resistors, capacitors, and transistors.
Description : What happens if a soldering gun switch is pressed for periods longer than 30 seconds?
Last Answer : It will overheat and could burn the insulation of the wire being soldered.
Description : The resonant frequency of electron wobble can be changed by variation of what force?
Last Answer : The applied magnetic field.
Description : Which of the two types of electron motion (orbital movement and electron spin) is more important in the explanation of magnetism?
Last Answer : Electron spin.
Description : What effect does closer spacing of plates have on the electron beam?
Last Answer : A greater deflection angle.
Description : What effect do longer deflection plates have on the electron beam?
Description : What term is used for the ability of a spot on a CRT screen to continue to glow after the electron bean has struck it and moved away?
Last Answer : Persistence.
Description : What are two advantages that gas-filled tubes have over conventional electron tubes?
Last Answer : a. They can carry more current. b. They maintain a constant IR drop across the tube
Description : Why is electron flow with the arrow in the symbol of a Zener diode instead of against the arrow as it is in a normal diode?
Last Answer : Because Zener diodes are operated in the reverse bias mode.
Description : What term is used to describe the definite discrete amounts of energy required to move an electron from a low shell to a higher shell?
Last Answer : Quanta.
Description : State one requirement of an electron tube, which does not exist for semiconductors, that makes the tube less efficient than the semiconductor.
Last Answer : The electron tube requires filament or heater voltage, whereas the semiconductor device does not; consequently, no power input is spent by the semiconductor for conduction.
Description : What type of deflection is preferred for a crt electron beam?
Last Answer : . Electromagnetic.
Description : In an electron tube regulator, the electron tube replaces what component?
Last Answer : Variable resistor.
Description : What type of electron-resonance anode block does not require strapping?
Last Answer : Rising-sun block.
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 : Debunching of the electron bunches in the higher modes of a reflex klystron has what effect on output power?
Last Answer : Power is reduced.