Description : Beam-forming tubes and power tubes are similar except that power pentodes lack what element?
Last Answer : Beam-forming plates.
Description : Other than the type of cell used, what is the major difference between the construction of the leadacid and nicad battery?
Last Answer : The cells in the nicad battery can be replaced.
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 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 serves as a grid in a magnetron?
Last Answer : A magnetic field.
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 : In a circuit using grid-leak biasing, the coupling capacitor (Cc) chargcharge path?
Last Answer : rkg, the cathode to grid resistance.
Description : Why the control grid of a triode amplifier is negatively biased?
Last Answer : To prevent them from drawing grid current.
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 : The suppressor grid is added to a tetrode to reduce what undesirable characteristic of tetrode operation?
Last Answer : Secondary emission.
Description : What undesirable effect does the screen grid in a tetrode create?
Last Answer : Secondary emission, and noise.
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 : 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 : When is a control-grid modulator used?
Last Answer : In cases when the use of a minimum of af modulator power is desired.
Description : What is a major advantage of modular construction?
Last Answer : Rapid repair of systems and improved efficiency
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 : What effect does transit time have on a conventional triode operated at uhf frequencies?
Last Answer : It causes the control grid to short to the cathode
Description : What main advantage does a bridge rectifier have over a conventional full-wave rectifier?
Last Answer : The bridge rectifier can produce twice the voltage with the same size transformer.
Description : What is the main disadvantage of a conventional full-wave rectifier?
Last Answer : Peak voltage is half that of the half-wave rectifier.
Last Answer : The bridge rectifier can produce double the voltage with the same size transformer.
Description : What is the main disadvantage of the conventional full wave rectifier?
Last Answer : The peak voltage is half that of a half-wave rectifier.
Description : The following are the advantages of the conventional methods of irrigation a. Low cost of construction b. Animals used for ploughing are utilised for drawing water c. Water can be lifted from great depths d. All of the above
Last Answer : d. All of the above
Description : What is the main difference in construction between normal PN junction diodes and tunnel diodes?
Last Answer : The amount of doping.
Description : What is the primary difference in construction between the basic magnetron and the negativeresistance magnetron?
Last Answer : The negative-resistance magnetron has a split plate
Description : The four major water supply distribution systems, are (A) Dead end, tree, grid iron and reticulation (B) Dead end, tree, grid iron and circular (C) Tree, grid iron, ring and radial (D) Tree, reticulation, circular and ring
Last Answer : (C) Tree, grid iron, ring and radial
Description : What kind of material must be used in the construction of waveguides?
Last Answer : Conductive material.
Description : What type of material is used in the construction of bolometers and thermistors?
Last Answer : Temperature-sensitive material that exhibits a large negative temperature coefficient.
Description : How do the two types of monolithic IC construction differ?
Last Answer : Diffusion penetrates substrate; epitaxial does not
Description : Name the two types of monolithic IC construction discussed.
Last Answer : Diffusion; epitaxial growth
Description : The way a magnetic head will be used determines how it is constructed. Name three factors that determine the final construction of a magnetic head.
Last Answer : a. Type of head (record, reproduce, or erase). b. Frequencies it will record or reproduce. c. Whether it will be used on a single or multitrack recorder.
Description : How can loss be reduced during construction (or fabrication) of optical fibers?
Last Answer : By removing the impurities from optical fiber.
Description : Would a priority system for each households power help a power grid?
Last Answer : I’d make freezer and fridge number 1 and internet number 2. My bathroom has a window so it’s not as big of a deal.I also keep lots of LED flashlights handy just in case of power failure. Not perfect, but it works
Description : What will happen to US Nuclear Power Plants when a massive solar flare burns out the entire US electrical power grid?
Last Answer : I think they are supposed to have backup generators, enough to keep cooling fluids circulating, including in spent-fuel pools. Hopefully the control systems of the backup power supply are hardened to solar ... . Just don't send a tsunami through the backup power switching rooms on top of that.
Description : If the Power Grid Gets Destroyed by Solar Flares, How Would You Spend Your Days?
Last Answer : oh, I would definitely think that I would try to get far away from other people. People, will definitely fail to maintain order in such a situation.
Description : Do you think the United States needs to make improvements to the Power Grid?
Last Answer : answer:My power goes out far too frequently – and I don’t live out in the boonies – so my answer is yes. I’m curious why China would have anything to do with a black out here in the states?
Description : In a 100 TPD Sponge Iron plant, the sponge iron is fed to the Induction melting furnace, producing molten steel at 88% yield. The Energy consumption details are as follows: Coal Consumption : 130 ... molten steel (product). 3. Total Energy Consumption of Plant in Tons of Oil Equivalent (TOE )
Last Answer : a) Specific Energy Consumption of Induction Melting Furnace Molten Steel Production from the Induction melting furnace per day = 100 x 88/100 = 88 TPD Total Energy Consumption of the Plant = 82400 kWh ... mark c) Total Energy consumption of Plant in ToE = 655864000/107 = 65.586 ToE
Description : Identify & explain any two difficulties faced while connecting WPP to the power grid.
Last Answer : Difficulties Faced while Connecting WPP to Power Grid: There are several technical issues associated with grid connected systems like power quality issues, power and voltage fluctuations, storage, protection ... that is out of phase with grid voltage and so provide power factor correction.
Description : Other than their physical differences, what is the major difference between a TDX and a TDR?
Last Answer : Their application: a TDX has one electrical and one mechanical input with an electrical output.
Description : What is the major difference between the electronics dry-air branch and the vital service lp air main?
Last Answer : Degree of dehydration.
Description : What is the major difference between direct reproduce electronics and FM reproduce electronics?
Last Answer : FM record electronics must use a limiter and demodulator circuit (figure 5-5) to demodulate the signal intelligence from the carrier frequency.
Description : What is the primary difference between the major and minor lobes of a radiation pattern?
Last Answer : Major lobes have the greatest amount of radiation.
Description : What is the major difference between a two-phase and a three-phase stator?
Last Answer : Number and location of field poles.
Description : What is the difference between SO grid references and SN grid references?
Last Answer : The ordnance survey splits the UK up into 100km squares. SN covers south west Wales and SO covers south east Wales and part of England (mainly Herefordshire if memory serves).
Description : In which non-conventional source of energy is India referred to as a super power ? -SST 10th
Last Answer : India is referred to as a super power in wind power.
Description : Which of the following is not one of the non-conventional sources of energy in India? (a) Solar Energy (b) Geo-Thermal Energy (c) Thermal Energy (d) Tidal Power
Last Answer : Ans: (c)
Description : Nayveli Power Project is a _______ Power Project. (a) Hydro-electric (b) Nuclear (c) Thermal (d) Non-conventional
Description : Which one is not a non-conventional energy source? (1) Nuclear energy (2) Solar Energy (3) Wind energy (4) Tidal power
Last Answer : (1) Nuclear energy Physical Geography (Set: 08)
Description : An important characteristic of the device shown in figure 'B' of the illustration as compared with conventional NPN or PNP transistors is its ____________. EL-0065 A. higher temperature sensitivity B. higher power ratings C. very high input resistance D. all of the above
Last Answer : Answer: C