Description : What is the major difference in grid construction between power pentodes and conventional pentodes?
Last Answer : Conventional pentodes have a staggered grid arrangement, while power pentodes have a shielded grid arrangement.
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 : What element is controlled to focus the beam?
Last Answer : The first anode.
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 : Why can acorn and doorknob tubes NOT handle large amounts of power?
Last Answer : The close spacing of tube elements allows for the ready formation of arcs or short circuits.
Description : Normally, how are high-power rf tubes tested?
Last Answer : In their circuit.
Description : Conifers differ from grasses in the (a) formation of endosperm before fertilization (b) production of seeds from ovules (c) lack of xylem tracheids (d) absence of pollen tubes.
Last Answer : (a) formation of endosperm before fertilization
Description : The base of a transistor serves a purpose similar to what element of the FET
Last Answer : Gate.
Description : Cold-cathode tubes can be used as voltage regulators because of what characteristic?
Last Answer : They have the ability to maintain a constant voltage drop across the tube despite changes in current flow.
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 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 : How do uhf tubes counter the effects of transit time?
Last Answer : By reducing the spacing between tube elements.
Description : During which of the transmit or receive cycles are both the tr and atr tubes of a parallelconnected duplexer ionized (arcing)?
Last Answer : Transmit.
Description : How did vacuum tubes cause a problem for first generation computers
Last Answer : They were unreliable, required a lot of power to run, and produced so much heat that air conditioning was needed to protect computer parts.
Description : In electronic computers, vacuum tubes were replaced by transistors and transistors have been replaced by what device?
Last Answer : Integrated circuits.
Description : When designing vacuum-tube circuits, what characteristics of tubes must be taken into consideration?
Last Answer : Differences in performance of tubes of the same type
Description : Vacuum tubes are designed to operate in what portion of the Ep - Ip
Last Answer : The linear portion.
Description : Inside a triangular park, there is a flower bed forming a similar triangle. Around the flower bed runs a uniform path of such a width that the -Maths 9th
Last Answer : (d) 3 : 1Let ABC be the triangular flower bed of side lengths a, b and c respectively. Then Area of ΔABC = \(\sqrt{s(s-a)(s-b)(s-c)}\)where s = \(rac{a+b+c}{2}\)Now according to the given condition,ΔPQR ... of ΔABC - Area of ΔABC= 3 (Area of ΔABC)∴ Reqd. Ratio = Area of Path : Area of ΔABC = 3 : 1.
Description : ____________________ is forming segments of consumers who have similar needs and buying behavior even though they are located in different countries. A. External segmentation B. International segmentation C. Intermarket segmentation D. Enriched segmentation
Last Answer : C. Intermarket segmentation
Description : A tube can fill a cistern in 18hrs.After half the cistern is filled, three more similar tubes are opened. What is the total time taken to fill the cistern completely ? A) 9hrs 52min B) 10hrs 15 min C) 9hrs 45 min D) 10hrs 30min
Last Answer : Time taken to fill half of the cistern = 18/2 = 9 hrs After half the cistern is filled , three more similar tubes are opened. We know that one tube can in 18 hrs can fill = V litres(i.e. fully fill a cistern) ... V/2 will be 2 hrs 15 min Total time = 9 hrs + 2 hrs + 15 min = 11 hrs 15 min
Description : Reducing assurance engagement risk to zero is very rarely attainable or cost beneficial as a result of the following factors, except a. The use of selective testing. b. The fact that much ... d. The use of judgment in gathering and evaluating evidence and forming conclusions based on that evidence
Last Answer : The practitioner may not have the required assurance knowledge and skills to gather and evaluate evidence.
Description : Muscles forming boundaries of digastric triangle are all except Options: 1) Anterior belly of digastric 2) Posterior belly of digastric 3) Stylohyoid 4) Sternocleidomastoid
Last Answer : 4) Sternocleidomastoid
Description : Specify the mechanism that SLDs lack that is required by laser diodes to achieve lasing.
Last Answer : SLDs have no built-in optical feedback mechanism.
Description : Which gas is filled in element bulbs/tubes?
Last Answer : Which gas is filled in element bulbs/tubes? A. Ar B. `N_(2)` C. He D. `O_(2)`
Description : I will be describing a chemical element. Try to identify it with the fewest number of clues. This chemical element is the most abundant of the rare-earth group. The element is a silver-gray metal ... factor in color television tubes. The atomic number of this element is 58. What is this element?
Last Answer : ANSWER: CERIUM (Ce)
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 : 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 : All the following conditions produce a real or functional deficiency of vitamin K except (A) Prolonged oral, broad spectrum antibiotic therapy (B) Total lack of red meat in the diet (C) The total lack of green leafy vegetables in the diet (D) Being a new born infant
Last Answer : Answer : B