Description : The electric field is perpendicular to the "a" dimension of a waveguide in what mode?
Last Answer : TE.
Description : A rectangular waveguide is 5.1 cm by 2.4 cm (inside dimension). The cut off frequency of the dominant mode is
Last Answer : A rectangular waveguide is 5.1 cm by 2.4 cm (inside dimension). The cut off frequency of the dominant mode is 2.94 GHz
Description : Modes that are bound at one wavelength may not exist at longer wavelengths. What is the wavelength at which a mode ceases to be bound called?
Last Answer : Cutoff wavelength
Description : An instrument has two strings. Both have the same length and are uniform. One of the strings is under twice as much tension as the other and also twice the mass of the other. Then which of ... d) Both strings vibrate with the same frequency and have the same wave-length and the same wave velocity.
Last Answer : Ans:(d)
Description : What determines the frequency, bandwidth, and power handling capability of a waveguide probe?
Last Answer : Size and shape
Description : What happens to the bus bar dimensions of the waveguide when the frequency is increased?
Last Answer : The bus bar becomes wider.
Description : The frequency range of a waveguide is determined by what dimensions?
Last Answer : . The "a" dimension.
Description : How will an iris that has portions along both the "a" and "b" dimension walls act at the resonant frequency?
Last Answer : As a shunt resistance.
Description : Sodium fluorescein: a. has a higher affinity for plasma protein than indocyanine green. b. does not leak from the choroidal vasculature. c. does not leak from normal retinal vasculature. d. emits light of longer wavelengths than the one it absorbs
Last Answer : does not leak from normal retinal vasculature.
Description : The large surface area of a waveguide greatly reduces what type of loss that is common in two-wire and coaxial lines?
Last Answer : Copper loss.
Description : The blue colour of sky is due to (1) reflection of sunlight (2) refraction of sunlight (3) scattering of shorter wavelengths of sunlight in the atmosphere (4) scattering of longer wavelengths of sunlight in the atmosphere
Last Answer : scattering of shorter wavelengths of sunlight in the atmosphere
Description : Silica (pure glass) fibers are used because of their low intrinsic material absorption at the wavelengths of operation. This wavelength of operation is between two intrinsic absorption regions. What are these two regions called? What are the wavelengths of operation for these two regions?
Last Answer : Ultraviolet absorption region (below 400 nm) and infrared absorption region (above 2000 nm).
Description : What is the most likely cause of losses in waveguide systems?
Last Answer : Improperly connected joints or damaged inner surface.
Description : What is the most common type of waveguide joint?
Last Answer : Choke joint.
Description : A waveguide bend must have what minimum radius?
Last Answer : Greater than 2 wavelengths.
Description : What is the result of an abrupt change in the size, shape, or dielectric of a waveguide?
Last Answer : Reflections.
Description : When a waveguide is terminated in a resistive load, the load must be matched to what property of the waveguide?
Last Answer : . Characteristic impedance.
Description : What device is used to produce a gradual change in impedance at the end of a waveguide?
Last Answer : Horn.
Description : What is the result of an impedance mismatch in a waveguide?
Last Answer : Standing waves that cause power losses, a reduction in power handling capability, and an increase in frequency and sensitivity.
Description : Loose or inefficient coupling of energy into or out of a waveguide can be accomplished by the use of what method?
Last Answer : Slots and apertures.
Description : Which subscript, in circular waveguide classification, indicates the number of full-wave patterns around the circumference?
Last Answer : First.
Description : How is the cutoff wavelength of a circular waveguide figured?
Last Answer : 1.71 times the diameter.
Description : What field configuration is easiest to produce in a given waveguide?
Last Answer : . Dominant mode
Description : What term is used to identify the forward progress velocity of wavefronts in a waveguide?
Last Answer : Group velocity.
Description : incidence and reflection that are perpendicular to the waveguide walls?
Last Answer : Cutoff frequency.
Description : Assuming the wall of a waveguide is perfectly flat, what is the angular relationship between the angle of incidence and the angle of reflection
Last Answer : The angles are equal.
Description : When a wavefront is radiated into a waveguide, what happens to the portions of the wavefront that do not satisfy the boundary conditions?
Last Answer : Decrease to zero.
Description : What interaction causes energy to travel down a waveguide?
Last Answer : The interaction of the electric and magnetic fields.
Description : The folded waveguide in a bwo serves the same purpose as what component in a twt?
Last Answer : Helix.
Description : How does a waveguide-type lens focus spherical wavefront microwave energy?
Last Answer : Some wavefronts are accelerated so that all wavefronts exit the lens at the same time
Description : Which dispersion mechanism (material or waveguide) is a function of the size of the fiber's core relative to the wavelength of operation?
Last Answer : Waveguide dispersion.
Description : What unit is used to measure the different wavelengths of light?
Last Answer : Angstrom unit.
Description : What determines the range of wavelengths over which meaningful data is obtained for calculating the chromatic dispersion?
Last Answer : The wavelength range of the optical source(s) used.
Description : Delay differences between the source wavelengths occur as the optical signal propagates along the fiber. What is this called?
Last Answer : Differential group delay t(l).
Description : When a wide band of frequencies is transmitted simultaneously, each frequency will vary in the amount of fading. What is this variable fading called?
Last Answer : Selective fading.
Description : What must happen a substance to appear black what must happen to all wavelengths of light?
Last Answer : A substance that appears black (in a lighted room) is absorbingall of the visible light that hits it, leaving no visible light toreflect off of it to your eye. So it's absorbing visible light ... 's happening to theinfra-red or ultraviolet hitting it. For that, you need to usedifferent detectors.)
Description : An ideal gas is maintained at constant temperature. If the pressure on the gas is doubled, the volume is a. increased fourfold b. doubled c. reduced by half d. decreased by a quarter
Last Answer : reduced by half
Description : Two or more antennas separated by 9 wavelengths are used. A. Hybrid diversity B. Space diversity C. Polarized diversity D. Frequency diversity
Last Answer : B. Space diversity
Description : Choose which of following condition is not required for a waveguide to exist. a) The dimensions should be in accordance with desired frequency b) Cut-off frequency should be minimum 6GHz c) The shape should be spherical d) No specific condition is required for waveguide design
Last Answer : c) The shape should be spherical
Description : In a waveguide, what is a frequency that would cause angles of incidence and reflection to be zero degrees?
Last Answer : Critical Frequency
Description : At what frequency compared to the cutoff frequency of a waveguide will the wavefronts be reflected back and forth across the guide (setting up standing waves) and no energy
Last Answer : UHF receiving antenna
Description : Define the term w.r.t. waveguide: (i) Cut-OFF frequency (ii) Group Velocity
Last Answer : Group velocity: It is defined as the rate at which the wave propagates through the waveguide and is given by The group velocity is also can be defined as the velocity of energy flow ... rectangular waveguide at a frequency below fc TE1,0. This is absolute cut off frequency of the waveguide.
Description : A rectangular waveguide is 4.2 cm by 1.85 cm. The cut-off frequency of the dominant mode through this waveguide is (a) 3.57 GHz (b) 3.75 GHz (c) 3.70 MHz (d) 3.57 MHz
Last Answer : A rectangular waveguide is 4.2 cm by 1.85 cm. The cut-off frequency of the dominant mode through this waveguide is 3.57 GHz
Description : Very High Frequency (VHF) have ----- wavelengths? A. shorter (Answer) B. shortest
Last Answer : A. shorter (Answer)
Description : A short column (30 cm 20 cm) carries a load P1 at 4 cm on one side and another load P2at 8 cm on the other side along a principal section parallel to longer dimension. If the extreme intensity on either side is same, the ... to P2 will be (A) 2/3 (B) 3/2 (C) 8/5 (D) 5/8
Last Answer : (C) 8/5
Description : The number of half-wave patterns in the "b" dimension of rectangular waveguides is indicated by which of the two descriptive subscripts?
Last Answer : Second.
Description : An iris placed along the "b" dimension wall produces what kind of reactance?
Last Answer : Inductive.
Description : Which of the following statements about total body water composition are correct? A. Females and obese persons have an increased percentage of body water. B. Increased muscle mass is associated with ... age. E. Any person's percentage of body water is subject to wide physiologic variation.
Last Answer : Answer: CD DISCUSSION: Since fat contains little water, lean persons with a proportionately greater muscle mass have a greater than expected volume of total body water. Likewise, the ... decreases steadily and significantly with age. The actual figure for a healthy person is remarkably constant
Description : “Nationalism no longer retained its idealistic liberal democratic sentiment by the last quarter of the nineteenth century in Europe.” Analyse the statement with examples. -SST 10th
Last Answer : Nationalism in Europe- The Balkans: . During this period nationalist groups become increasingly intolerant of each other. . Manipulations of the nationalist aspirations were there. . The Balkan was under the control ... . This led to a series of wars in the region and finally the First World War.
Description : “Nationalism no longer retained its idealistic liberal democratic sentiment by the last quarter of the nineteenth century in Europe.” -SST 10th
Last Answer : Sentiment of Nationalism in the first half of the 19th century: (i) Towards the last quarter of the 19th century, nationalism could not retain its idealistic liberal-democratic sentiment of the ... to define their identity and independence, the Balkan area became an area of intense conflict.