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 : Trade-offs between competing effects are necessary for high speed response. Which competing effect (fast transit time, low capacitance, or high quantum efficiency) requires a thin active area?
Last Answer : Fast transit time.
Description : What type of uhf tube was developed to handle large amounts of power?
Last Answer : Planar
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 junction arrangement of the original avalanche transit-time diode?
Last Answer : Pnin.
Description : What characteristic of a gunn oscillator is inversely proportional to the transit time of the domain across the semiconductor?
Last Answer : The frequency.
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 : 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 : 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 : Beam-forming tubes and power tubes are similar except that power pentodes lack what element?
Last Answer : Beam-forming plates.
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 : Normally, how are high-power rf tubes tested?
Last Answer : In their circuit.
Description : Pick out the wrong statement. (A) The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system (B) Entering velocity of the liquid in ... a multiple effect evaporation system, the number of effects is limited by the total boiling point rise
Last Answer : (C) Duhring's plot is used for calculating the concentration of solution
Description : Has there even been UHF channels?
Last Answer : Yes. The UK was UHF. It varies by region.
Description : What is the full form of 'UHF' ? -How To ?
Last Answer : The full form of 'UHF' is Ultra High Fequency
Last Answer : UHF - Ultra High Frequency
Last Answer : Ultra High Frequency.
Description : In what range of frequencies are most omnidirectional horizontally polarized antennas used? A. VHF, UHF B. VLF, LF C. SH, EHF D. MF, HF
Last Answer : A. VHF, UHF
Description : What frequency band is referred to as the metric waves? A. VHF B. UHF C. HF D. SHF
Last Answer : A. VHF
Description : What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave
Last Answer : D. A frequency modulated continuous wave
Description : What connector is popular in attaching test instruments like oscilloscopes, frequency counters, spectrum analyzers, etc? A. UHF connector B. PL-259 C. BNC D. SMA
Last Answer : C. BNC
Description : Which of the following coaxial cable connectors is called the UHF connector? A. PL-259 B. BNC C. N-type connector D. F connector
Last Answer : A. PL-259
Description : Assuming a UHF frequency range of 405.0125 MHz to 405.0875 MHz at 25 kHz channeling plan, how many channels can you produce? A. 2.5 ch. B. 2 ch. C. 4 ch. D. 3 ch.
Last Answer : D. 3 ch.
Description : Which band does channel 14 of the television channel belong? A. High VHF band B. EHF band C. UHF band D. Low VHF band
Last Answer : C. UHF band
Description : Channel 7 of the regular television channel belongs to which band? A. Low VHF band B. High VHF band C. Low UHF band D. High UHF band
Last Answer : B. High VHF band
Description : TV channels 2, 4 and 5 are known as ________. A. Mid band UHF B. Low band UHF C. High band VHF D. Low band VHF
Last Answer : D. Low band VHF
Description : Troposheric scatter uses the frequencies in the ________ band. A. VLF B. UHF C. VHF D. UF
Last Answer : B. UHF
Description : When was the UHF channel (14-83) of television were added? A. 1852 B. 1904 C. 1947 D. 1952
Last Answer : D. 1952
Description : Which frequency band is the standard AM radio broadcast? A. HF B. UHF C. MF D. VHF
Last Answer : C. MF
Description : Tropospheric scatteris usedwith frequenciesinthe followingrange: a. HF b. VHF c. UHF d. VLF
Last Answer : c. UHF
Description : The frequency band of the ILS glidepath is: a. UHF b. VHF c. SHF d. VLF
Last Answer : a. UHF
Description : Which frequency band is a wavelength of 1200m? a. UHF b. LF c. HF d. MF
Last Answer : b. LF
Description : What range of frequencies are usually referred to as the Ultra High Frequency (UHF) Band? w) 3 to 30 Mega Hertz x) 30 to 300 Mega Hertz y) 300 to 3,000 Mega Hertz z) 30,000 to 300,000 Mega Hertz
Last Answer : ANSWER: Y -- 300 to 3,000 MEGA HERTZ
Description : What range of frequencies are usually referred to as the UHF Band? w) 3 to 30 Megahertz x) 30 to 300 Megahertz y) 300 to 3,000 Megahertz z) 30,000 to 300,000 Megahertz
Last Answer : ANSWER: Y -- 300 TO 3,000 MEGAHERTZ
Last Answer : Frequency in the UHF range propagate by means of Space waves.
Last Answer : Frequencies in the UHF range propagate by means of space wave.
Last Answer : UHF band is given by 300 MHz to 3000 MHz.
Description : What is the difference between a positive counter and a step counter?
Last Answer : The load resistor in a positive counter is replaced by a capacitor in a step counter.
Description : What is the largest count that can be indicated by a four stage counter?
Last Answer : 11112, or 1510.
Description : . What type of counter has clock pulses applied to all FFs?
Last Answer : Synchronous.
Description : An asynchronous counter is also called a ___________ counter.
Last Answer : Ripple
Description : What is the modulus of a five-stage binary counter?
Last Answer : 32.
Description : What is meant by induced emf? By counter emf?
Last Answer : Induced emf is the emf which appears across a conductor when there is relative motion between the conductor and a magnetic field; counter emf is the emf induced in a conductor that opposes the applied voltage.
Description : What motor characteristic is affected by counter emf?
Last Answer : Speed.