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 : If the constant-speed electrons in a reflex klystron remain in the repeller field for 1 3/4 cycles, what is the mode of operation?
Last Answer : Mode 2.
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 : When the repealer potential is constant, what property of the electron determines how long it will remain in the drift space of the reflex klystron?
Last Answer : Velocity.
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 type of klystron is used as the final stage of a power- amplifier transmitter?
Last Answer : Multicavity klystron.
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.
Description : What element of the reflex klystron replaces the output cavity of a normal klystron?
Last Answer : The reflector or repeller.
Description : The cavities of a multicavity klystron are tuned to slightly different frequencies in what method of tuning?
Last Answer : Stagger tuning.
Description : In a multicavity klystron, tuning all the cavities to the same frequency has what effect on the bandwidth of the tube?
Last Answer : The bandwidth decreases.
Description : Which cavity of a three-cavity klystron causes most of the velocity modulation?
Last Answer : The middle cavity.
Description : What can be added to the basic two-cavity klystron to increase the amount of velocity modulation and the power output?
Last Answer : Intermediate cavities between the input and output cavities.
Description : A two-cavity klystron without a feedback path will operate as what type of circuit?
Last Answer : Amplifier.
Description : The two-cavity klystron uses what cavity as an output cavity?
Last Answer : The catcher cavity.
Description : What is the basic principle of operation of a klystron?
Last Answer : Velocity modulation
Description : What limits the tuning range around the center frequency of a reflex klystron in a particular mode of operation?
Last Answer : The half-power points of the mode.
Description : What should you do if a klystron becomes gassy?
Last Answer : Restore it to serviceable condition by operating it temporarily at reduced beam voltage.
Description : belt of silk runs over two metal pulleys, one of which is surrounded by a hollow metal sphere. Two electrodes, in the form of comb-shaped rows of sharp metal points, are positioned ... potential is applied to the upper pulley. A simple version of which equipment is being described here?
Last Answer : Van de Graaff generator.
Description : How is a beam of electrons velocity-modulated?
Last Answer : By alternately speeding up or slowing down the electrons
Description : A slow-running pendulum clock can be speeded up by? A. Reducing the weight of the bob B. Reducing the length of the rod C. Increasing the weight of the bob D. Increasing the length of the rod
Last Answer : ANSWER: B
Description : The cooling effect in a cooling tower can be speeded up by (A) Increasing the air velocity and area of exposed wet surface (B) Reducing the barometric pressure (C) Reducing the humidity of the air (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : A slow-running pendulum clock can be speeded up by--------? A. Increasing the length of the rod B. Increasing the weight of the bob C. Reducing the length of the rod (Answer) D. Reducing the weight of the bob
Last Answer : C. Reducing the length of the rod (Answer)
Description : In sewage treatment, its sedimentation is speeded up by commonly adding (A) Hydrochloric acid (B) Lime (C) Copper sulphate (D) Sodium sulphate
Last Answer : (B) Lime
Description : A production operative at a cheese factory discovered that the slicing process could be speeded up if the machine had a certain type of arm attached. He consulted the supervisor about purchasing one. The operative would be considered the A)user B)influencer C)buyer D)decider E)gatekeeper
Last Answer : A)user
Description : Ionisation potential applied across the electrodes of electrostatic tar precipitator is around (A) 230 V AC (B) 60 KV AC (C) 230 V DC (D) 60 KV DC
Last Answer : (D) 60 KV DC
Description : A potential difference of 10 V is applied across a conductor of resistance `1 k Omega`. Find the number of electrons flowing through the conductor in
Last Answer : A potential difference of 10 V is applied across a conductor of resistance `1 k Omega`. ... of electrons flowing through the conductor in 5 minutes.
Description : On the diagram below, name the elements of the vacuum tube and their potentials relative to dc ground. time is an example of what type of transmission?
Last Answer : a. Plate, positive. b. Suppressor grid, negative.
Description : A major and basic advantage for the use of a klystron. A. High power B. Efficiency C. Lesser noise D. Cheaper
Last Answer : A. High power
Description : Which of the following types of HPA is not used in earth stations? A. TWT B. Transistor C. Klystron D. Magnetron
Last Answer : D. Magnetron
Description : Describe working of Reflex Klystron amplifier with a neat diagram.
Last Answer : Operation: It is assumed that the oscillations are set up in the tube initially due to noise or switching transients and these oscillations are sustained by device operation. ... on the reference electron. These bunch transfer maximum energy to the gap to get sustained oscillations.
Description : Klystron operation is based on the principle of a) Velocity modulation b) Amplitude modulation c) frequency modulation d) Phase modulation
Last Answer : Klystron operation is based on the principle of Velocity modulation
Description : A two cavity klystron tube is a (A) velocity modulated tube (B) frequency modulated tube (C) Amplitude modulated tube (D) simple triode
Last Answer : A two cavity klystron tube is a velocity modulated tube
Description : In a Klystron amplifier, the RF voltage produces (a) amplitude modulation (b) frequency modulation (c) phase modulation (d) velocity modulation
Last Answer : In a Klystron amplifier, the RF voltage produces velocity modulation
Description : In a klystron amplifier the input cavity is called: (1) Buncher (2) Catcher (3) Pierce gun (4) Collector
Last Answer : In a klystron amplifier the input cavity is called: Buncher.
Description : Reflex klystron is a: (1) Low power generator (2) High power oscillator (3) Low gain amplifier (4) Not an oscillator
Last Answer : Reflex klystron is a: Low power generator.
Last Answer : The modes in a reflex Klystron gives the same frequency but different transit time.
Description : What happens to the electrons of a gallium-arsenide semiconductor when they move from the normal low-energy conduction band to the high-energy conduction band?
Last Answer : The electrons become immobile.
Description : The electrical supply applied to the anodes shown in the illustration is _____________. EL-0090 A. low voltage, high current DC B. low voltage, high current AC C. high voltage, low current DC D. high voltage, low current AC
Last Answer : Answer: A
Description : A high voltage applied to a gas discharge tube containing neon gas at very low pressure causes a current to flow through the tube. Which one of the following are the particles that flow towards the ... Are they w) electrons x) protons y) negatively charged neon ions z) positively charged neon ions
Last Answer : ANSWER: Z -- POSITIVELY CHARGED NEON IONS
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 : 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 : 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 : Beam-forming tubes and power tubes are similar except that power pentodes lack what element?
Last Answer : Beam-forming plates.