Description : The mode theory uses electromagnetic wave behavior to describe the propagation of the light along the fiber. What is a set of guided electromagnetic waves called?
Last Answer : Modes of the fiber.
Description : Two methods describe how light propagates along an optical fiber. These methods define two theories of light propagation. What do we call these two theories?
Last Answer : The ray theory and the mode theory.
Description : How is a wave defined as it applies to wave propagation?
Last Answer : A wave is a disturbance which moves through a medium
Description : An electromagnetic wave is ________ polarized when the electric field lies wholly in one plane containing the direction of propagation. A. Horizontally B. Linearly C. Circularly D. Vertically
Last Answer : B. Linearly
Description : What type of wave motion is represented by the motion of water?
Last Answer : Transverse waves.
Description : In which plane will the half-wave antenna be operating if it is mounted horizontally?
Last Answer : Vertical plane.
Description : What condition causes a light ray to be totally reflected back into its medium of propagation?
Last Answer : Total internal reflection occurs when the angle of refraction approaches 90 degrees. This condition occurs when the angle of incidence increases to the point where no refraction is possible.
Description : Describe the effect of ionosphere on sky wave propagation.
Last Answer : The Ionosphere is the upper portion of the atmosphere. The ultra violet radiation from the sun will ionize the upper layer of the atmosphere. In this layer free electrons and positive and negative ions are ... layer. Its Frequency Range is from 3 MHz to 30 MHz Polarization: Vertical.
Description : Ratio of the velocity of propagation of a light ray in free space to the velocity of propagation of a light ray in free space in a given material. ∙ A. refractive index ∙ B. standing wave ratio ∙ C. velocity factor ∙ D. propagation velocity
Last Answer : ∙ A. refractive index
Description : In the Argand plane, the vector z = 4 - 3i is turned in the clockwise sense through 180^@` and stretched three times. The complex number represented n
Last Answer : In the Argand plane, the vector z = 4 - 3i is turned in the clockwise sense through 180^@` and stretched three ... `12-9i` C. `-12-9i` D. `12-9i`
Description : What is the term used to describe the basic frequency of a radio wave?
Last Answer : Fundamental frequency.
Description : What is the term used to describe a whole number multiple of the basic frequency of a radio wave?
Last Answer : Harmonic frequency or harmonics.
Description : What terms are often used to describe basic half-wave antennas?
Last Answer : Dipole, doublet and Hertz.
Description : Compared to the velocity of propagation of waves in air, what is the velocity of propagation of waves in waveguides?
Last Answer : Slower.
Description : What is propagation?
Last Answer : Propagation means spreading out.
Description : Where is the tropospheric region that contributes most strongly to tropospheric scatter propagation?
Last Answer : Near the mid-point between the transmitting and receiving antennas, just above the radio horizon.
Description : Which radio frequency bands use the tropospheric scattering principle for propagation of radio waves?
Last Answer : Vhf and above
Description : In the right-hand rule for propagation, the thumb points in the direction of the E field and the forefinger points in the direction of the H field. In what direction does the middle finger point?
Last Answer : Direction of wave propagation.
Description : The value of the normalized frequency parameter (V) relates the core size with mode propagation. When single mode fibers propagate only the fundamental mode, what is the value of V?
Last Answer : V≤2.405.
Description : Dispersion is used to describe the a. Splitting of white light into its component colors b. Propagation of light in straight lines c. Bending of a beam of light when it goes from one medium to another d. Bending of a beam light when it strikes a mirror
Last Answer : a. Splitting of white light into its component colors
Description : Dispersion is used to describe the ∙ a. Splitting of white light into its component colors ∙ b. Propagation of light in straight lines ∙ c. Bending of a beam of light when it goes from one medium to another ∙ d. Bending of a beam light when it strikes a mirror
Description : Optically active compounds are capable of (A) Different reactions (B) Rotating plane of polarized light (C) Showing same chemical properties (D) None of these
Last Answer : Answer : B
Description : Two thin slabs of refractive indices `mu_(1)` and `mu_(2)` are placed parallel to each other in the x-z plane. If the direction of propagation of a ra
Last Answer : Two thin slabs of refractive indices `mu_(1)` and `mu_(2)` are placed parallel to each other in the x-z plane. If ... )+d^(2))` D. `mu_(1) b=mu_(2)a`
Description : Electromagneticwaves are refractedwhen they a. pass into a medium of different dielectric constant b. are polarized at right angles to the direction of propagation c. encounter a perfectly conducting plane d. pass through a small slot in a conducting plane
Last Answer : a. pass into a medium of different dielectric constant
Description : Explain ionospheric propagation with neat sketch. Explain two properties of layers of ionosphere.
Last Answer : Diagram : Explanation: The transmitted signal travels into the upper atmosphere where it is reflected back to earth due to the presence of layers called as ionosphere in the upper ... having highest electron density of all layers, due to this F2 layer remains present at night time.
Description : A light wave enters a sheet of glass at a perfect right angle to the surface. Is the majority of the wave reflected, refracted, transmitted, or absorbed?
Last Answer : Transmitted.
Description : A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes- (1) x/2 (2) x (3) 2x (4) x/4
Last Answer : (2) x Explanation: When a ray of light incident on a boundary separating two media comes back into the same media, this phenomenon, is called reflection of light. After reflection velocity, wavelength and frequency of light remains same but intensity decreases.
Description : In Fraunhofer diffraction wave front used is __________. A. Spherical B. Circular C. Plane D. Conical 71.In diffraction pattern of monochromatic light the bright bands formed are __________. A. of uniform intensity B. of non-uniform intensity C. of uniform width D. is of different colors
Last Answer : A. of uniform intensity
Description : A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes :
Last Answer : x
Description : What type of gate is represented by the output Boolean expression R T Å ?
Last Answer : Exclusive NOR (X-NOR).
Description : A constant represented by a voltage can be read to what decimal place?
Last Answer : Third.
Description : By using an 8-bit code, how many characters or bit combinations can be represented?
Last Answer : 256.
Description : How is data represented?
Last Answer : By symbols.
Description : Which properties shows that light is a transverse wave
Last Answer : Polarisation
Description : Attenuation is mainly a result of what three properties?
Last Answer : Light absorption, scattering, and bending losses.
Description : Modal dispersion affects the bandwidth of multimode systems. It is essential to adjust what three fiber properties to maximize system bandwidth?
Last Answer : Core diameter, NA, and index profile properties.
Description : Two particles of of a medium disturbed by the wave propagation are at `x_(1) = 0` and `x_(2) = 1 cm`. The wave is propagating in positive x-direction.
Last Answer : Two particles of of a medium disturbed by the wave propagation are at `x_(1) = 0` and `x_(2) = 1 cm`. The ... `y = (2) sin [(2pi)/(16)(24t-x)]cm`.
Description : What are compressional waves with particle motion in the same direction as wave propagation?
Last Answer : What is the answer ?
Description : A travelling wave passes a point of observation where the time interval between successive crests is 0.2 s. Which of the following is then true? (a) The wavelength is 5 m (b) The wavelength is 0.2 m (c) The velocity of propagation is 5 m/s (d) The frequency of 5 Hz.
Last Answer : Ans:(d)
Description : The rhombic antenna is primarily used for A. ground wave propagation B. space wave propagation C. ionosphere scatter propagation D. sky wave propagation
Last Answer : D. sky wave propagation
Description : Which of the following layers of the ionosphere has no effect on sky wave propagation during daytime? A. D B. E C. F1 D. F2
Last Answer : A. D
Description : What device measures the angle between two radio frequencies and also the direction of propagation of a wave? A. Densimeter B. Absorption wavemeter C. Goniometer D. Ergometer
Last Answer : C. Goniometer
Description : The decimetric wave is using what method of propagation? A. Ground wave B. Space wave C. Sky wave D. Tropospheric wave
Last Answer : B. Space wave
Description : What is the resultant field strength at the receiving antenna in space wave propagation under case 2? A. 0 B. ξd C. 2ξd D. 3ξd
Last Answer : C. 2ξd
Description : Tropospheric scatter is a method of sky wave propagation for which of the following frequency bands? A. 300 kHz to 3 MHz B. 3 MHz to 30 MHz C. 30 MHz to 300 MHz D. 300 MHz to 3 GHz
Last Answer : D. 300 MHz to 3 GHz
Description : To obtain the most reliable sky wave propagation the ____ should be used. A. Lowest useable frequency (LUF). B. Maximum useable frequency (MUF). C. Optimum useable frequency (OUF). D. Critical frequency
Last Answer : C. Optimum useable frequency (OUF).
Description : Which if the following layers of the ionosphere has no effect on sky wave propagation during the hours of darkness? A. D B. E C. F1 D. F2
Description : Which of the following frequency bands is best suited for sky wave propagation? A. 30 to 300 kHz B. 3 MHz to 30 MHz C. 30 MHz to 300 MHz D. 3 GHz to 30 GHz
Last Answer : B. 3 MHz to 30 MHz
Description : Which of the following frequency bands is best suited for ground wave propagation? A. 30 to 300 kHz B. 300 kHz to 3 MHz C. 3 MHz to 30 MHz D. 30 MHz to 300 MHz
Last Answer : A. 30 to 300 kHz