What effect does the shielding of the screen grid by the  control grid have on plate current in beam-forming tetrodes?

1 Answer

Answer :

By increasing the number of electrons that reach the plate, plate  current is increased.

Related questions

Description : Why does the grid have a greater effect than the plate on electron flo

Last Answer : Because it is closer to the cathode.

Description : A tube has a transconductance of 800 mhos and a load resistor of 50 kohms. When control grid voltage varies by 6 volts, the plate voltage will vary by what amount?

Last Answer : 240 volts.

Description : If the mu of a tube is 85 and the signal at the control grid is 4 volts ac, the plate voltage will vary by what amount?

Last Answer : 340 volts.

Description : The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?

Last Answer : 42.

Description : How does transit time affect the relationship of the grid voltage and the plate current at high frequencies?

Last Answer : Transit time causes the grid voltage and plate current to be out of phase

Description : What undesirable effect does the screen grid in a tetrode create?

Last Answer : Secondary emission, and noise.

Description : Beam-forming tubes and power tubes are similar except that power pentodes lack what element?

Last Answer : Beam-forming plates.

Description : How does the addition of a screen grid in a tetrode reduce interelectrode capacitance?

Last Answer : The interelectrode capacitance (cpg) is divided between two series capacitances; thus, cpg is greatly reduced.

Description : Once ionization has occurred in a thyratron, what control does the control grid have over the tube’s operation?

Last Answer : None.

Description : Why the control grid of a triode amplifier is negatively biased?

Last Answer : To prevent them from drawing grid current.

Description : When is a control-grid modulator used?

Last Answer : In cases when the use of a minimum of af modulator power is desired.

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 : Signal splitting in NMR arises from? A. Shielding effect B. Spin-spin decoupling C. Spin-spin coupling D. Deshielding effecr

Last Answer : Spin-spin coupling

Description : State the function of following components of a nuclear power station: i) Moderator ii) Shielding iii) Control rod iv) Coolant 

Last Answer : i) Function of Moderator :- Moderator is to moderate or reduce the speed of fast neutron to help the fission process.  ii) Function of sheilding : Shielding is to protect environment, ... from reactor core and transfer it in heat exchanger for producing steam at high pressure and temperature. 

Description : Which one is not the basic electrical protection measures in the Philippine Electronics Code? A. Voltage/ current limiting and interrupting B. Undergrounding C. Grounding and bonding D. Shielding

Last Answer : B. Undergrounding

Description : Which of the listed components does line 'C' represent for the transistor illustrated? EL-0068 A. Grid B. Plate C. Emitter D. Collector

Last Answer : Answer: C

Description : What are the three elements of a bipolar transistor? Are they the: w) grid, plate, cathode x) suppressor, deflector, target y) energizer, controller, terminus z) emitter, base, collector

Last Answer : ANSWER: Z -- EMITTER, BASE, COLLECTOR

Description : What effect does closer spacing of plates have on the electron beam?

Last Answer : A greater deflection angle.

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?

Last Answer : A greater deflection angle.

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 serves as a grid in a magnetron?

Last Answer : A magnetic field.

Description : In a circuit using grid-leak biasing, the coupling capacitor (Cc) chargcharge path?

Last Answer : rkg, the cathode to grid resistance.

Description : The suppressor grid is added to a tetrode to reduce what undesirable characteristic of tetrode operation?

Last Answer : Secondary emission.

Description : Fire-control tracking radar most often radiates what type of beam?

Last Answer : A narrow circular beam.

Description : which of the following radiations have least effect on both the photographic plate and zinc sulphide screen?

Last Answer : which of the following radiations have least effect on both the photographic plate and zinc sulphide ... `gamma-decays D. All have equal effect

Description : In an oscilloscope, ___ adjusts the brightness of the spot by chaning the current on the control grid.

Last Answer : intensity control

Description : How much must the fpa plate current vary to produce 100- percent modulation in a plate modulator?

Last Answer : Between 0 and nearly two times its unmodulated value.

Description : The ___________ of a CRO controls the brightness of the spot formed on the screen a) Filament b) Grid c) Deflection plates d) Cathode

Last Answer : b) Grid

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 is electrons shielding?

Last Answer : The shielding effect describes the decrease in attractionbetween an electron and the nucleus in any atom with more than oneelectron shell. It is also referred to as the screening effect or ... attraction exerted by the positive charge in thenucleus.Also, it has trends in the Periodic Table

Description : What is the proper procedure for suppressing electrical noise in a mobile station? A. Apply shielding and filtering where necessary B. Insulate a all plain sheet metal surfaces from each other C. ... -static spray liberally to all nonmetallic D. Install filter capacitors in series with all dc wiring

Last Answer : A. Apply shielding and filtering where necessary

Description : What is the function of shielding?

Last Answer : Shielding prevents radiations to reach outside the reactor. Lead blocks and concrete enclosure that is strong enough of several meters thickness are used for shielding.

Description : What is the meaning of the term velocity factor of a transmission line? A. The ratio of the characteristic impedance of the line to the terminating impedance B. The index of shielding for coaxial ... The velocity of the wave on the transmission line divided by the velocity of light in a vacuum.

Last Answer : D. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum.

Description : One of the following is a possible cause for a slow drift of frequency in a self-exited transmitter oscillator circuits resulting to a poor frequency stability. A. Loose shielding B. ... capacitor in the oscillator C. Poor soldered connections D. Faulty capacitor, resistor, tubes or resistors

Last Answer : B. Heating of capacitor in the oscillator

Description : How do you eliminate radio frequency variation of an oscillator transmitter caused by its supply voltage? A. Use new power supply B. Lossen power supply shielding C. Use of regulated power supply D. Use of high capacitor in the supply circuit

Last Answer : C. Use of regulated power supply

Description : What is the meaning of the term velocity factor of a transmission line? A. The index of shielding for coaxial cable B. The velocity of the wave on the transmission line multiplied by the velocity of ... The velocity of the wave on the transmission line divided by the velocity of light in a vacuum

Last Answer : D. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum

Description : An advantage of optic fiber rejecting an induced noise signals from magnetic field or solar storms flux. A. Electric hazard B. Cross talk C. Immunity to noise D. Shielding

Last Answer : C. Immunity to noise

Description : How can receiver desensitizing be reduced? A. Increase the receiver bandwidth B. Ensure good RF shielding between the transmitter and receiver C. Increase the transmitter audio gain D. Decrease the receiver squelch, gain.

Last Answer : D. Decrease the receiver squelch, gain.

Description : The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields (a) meter is surrounded by strong magnetic fields (b) a soft ... is used (c) a plastic shielding is provided (d) a shielding of anon-magnetic material is used

Last Answer : (b) a soft iron shielding is used

Description : The thickness of metallic shielding on cables is usually (a) 0.04 mm (b) 0.2 to 0.4 mm (e) 3 to 5 mm (d) 40 to 60 mm

Last Answer : (a) 0.04 mm

Description : What course of action should be taken upon finding a welder using incorrect shielding gas? a) Allow welding to proceed if the workmanship is good b) Report the incident and record all relevant ... the same as the approved one d) Change the electrode for the correct type and continue welding

Last Answer : b) Report the incident and record all relevant information

Description : What is shielding in NMR? A. Using a curved piece of metal to block an opponent’s attack B. Putting metal around an Rf source C. When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei D. Blocking parts of a molecule from Rf radiation

Last Answer : When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

Description : Superconducting materials are being used in the Superconducting Super Collider to: w) cool the particles. x) minimize electrical power consumption. y) maximize the acceleration potentials. z) provide radiation shielding.

Last Answer : ANSWER: X -- MINIMIZE ELECTRICAL POWER CONSUMPTION.

Description : State the function of biological shielding in case of Nuclear Reactor and give material used for it.

Last Answer : Function of biological shielding in Nuclear Reactor:  Shielding is provided to absorb alpha, beta particles and gama rays which are produced during nuclear chain reaction (fission process) The ... of Water or concrete wall are provided all around the reactor vessel for stopping neutrons. 

Last Answer : Explanation of 'Nuclear shielding' in Nuclear Power Plant:  Shielding is provided to absorb alpha, beta particles and gama rays which are produced during nuclear chain reaction (fission process) The ... of Water or concerate wall are provided all around the reactor vessel for stopping neutrons.  

Description : Explain the purpose of shielding and reflector in a nuclear reactor.

Last Answer : 1. Shielding:-  The function of sheilding is to protect environment, humens and animals from the harmful radioactive radiation (pollution).before they are emitted to atmosphere. Shilding is provided to ... :- The function of reflector is to reflect back the neutrons which are leaving from core.

Description : The degree of protection by ground wire depends upon the a. Arcing angle b. Shielding angle c. Power factor d. All of above

Last Answer : The degree of protection by ground wire depends upon the a. Arcing angle b. Shielding angle c. Power factor d. All of above

Last Answer : The commonly used material for shielding or screening magnetism is soft iron.

Description : When a beam of ordinary white light is passed through a Polaroid plate filter, the intensity of the beam that emerges is: w) equal to that of the incident beam x) about 0.9 that of the incident beam y) about one-half that of the incident beam z) practically zero

Last Answer : ANSWER: Y -- ABOUT ONE-HALF THAT OF THE INCIDENT BEAM