When the wave travels in a conducting medium, the rate of attenuation is decided by Both attenuation constant and phase constant
Description : Which of the following phenomena is possible is free space medium? A. Reflection of radio wave B. Diffraction of radio wave C. Refraction of radio wave D. Attenuation of radio wave
Last Answer : D. Attenuation of radio wave
Description : Why is a dead-zone fiber placed between the test fiber and OTDR when conducting attenuation measurements?
Last Answer : To reduce the effect of the initial reflection at the OTDR
Description : Speed ‘v’ with which wave travels through a medium is given by A. modulus of elasticity/density of the medium B. modulus of elasticity/√(density of the medium) C. √(modulus of elasticity/density of the medium) D. v=d/t
Last Answer : √(modulus of elasticity/density of the medium)
Description : The speed of any mechanical wave as it propagates through a medium is dependent mainly on the A. frequency of the wave source B. wavelength C. period of the wave D. type of medium through which the wave travels E. amplitude
Last Answer : D. type of medium through which the wave travels
Description : The loss in signal power as light travels down a fiber is called a. Dispersion b. Scattering c. Absorption d. Attenuation
Last Answer : d. Attenuation
Description : ECE Board Exam November 1996 The loss in signal power as light travels down a fiber is A. attenuation B. propagation C. absorption D. scattering
Last Answer : A. attenuation
Description : The loss in signal power as light travels down the fiber is called a. attenuation b. progragation c. scattering d. interruption
Last Answer : attenuation
Description : The loss in signal power as light travels down the fiber is called ............. A) Attenuation B) Propagation C) Scattering D) Interruption
Last Answer : A) Attenuation
Description : The loss in signal power as light travels down a fiber is called ∙ a. Dispersion ∙ b. Scattering ∙ c. Absorption ∙ d. Attenuation
Last Answer : ∙ d. Attenuation
Description : The method suitable for heating of a conducting medium is (a) Induction heating (b) Indirect arc heating (c) Eddy current heating (d) Resistance heating
Last Answer : Induction heating is used for heating of a conducting medium
Description : Which of the answers listed below best completes the statement: The rate at which any part of a wave travels from one place to another determines the wave's: w) propagation velocity x) period y) amplitude z) frequency
Last Answer : ANSWER: W -- PROPAGATION VELOCITY
Description : ________ is a typeof transmission impairment in which the signal loses strength due to theresistance of the transmission medium. A) Attenuation B) Distortion C) Noise D) Decibel
Last Answer : Attenuation
Description : ..................... is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium. (A) Attenuation (B) Distortion (C) Noise (D) Decibel
Last Answer : (A) Attenuation
Description : The phase shift in the electric and magnetic fields in an EM wave is given by which parameter? a) phase constant b) attenuation constant c) propagation constant d) intrinsic impedance
Last Answer : d) intrinsic impedance
Description : What three factors must be considered in the transmission of a surface wave to reduce attenuation?
Last Answer : (a) electrical properties of the terrain (b) frequency (c) polarization of the antenna
Description : Why are visible-light LEDs not used for fiber optics? ∙ a. It has high losses ∙ b. It has short wave ∙ c. It has low attenuation ∙ d. It has weak signal
Last Answer : ∙ a. It has high losses
Description : What are electrons flowing through a conducting medium is called?
Last Answer : current
Description : Pick up the correct statement from the following: (A) Permeability is a measure of conducting the magnetic lines of force in the material (B) Permeability is a measure of the extent to which magnetic ... magnetic flux density (B) to the field strength of the magnetizing field (D) All of these
Last Answer : Answer: Option D
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 : If sound travels through matter (air) and gas is a medium then what medium slows down the flow of sound the most?
Last Answer : Vacuum.
Description : The refractive indices of four media A, B, C and D are given in the following table: light-reflection-and-refraction-chapter-wise-important-questions-class-10-science-9 If light, travels from one medium to another, in which case the change in speed will be (i) minimum, (ii) maximum? -Physics
Last Answer : (i) Minimum change is seen as light moves between 1.50 and 1.52, i.e. B and C. (ii) Maximum change when light moves between 1.33 and 2.40, i.e. A and D.
Description : The characteristic invalid for heat radiation is that it travels – (1) in a straight line (2) in all directions (3) with the speed of light (4) heating the medium through which it passes
Last Answer : (3) with the speed of light Explanation: Heat is a form of energy. An important property of heat is that it flows from a body at higher temperature to another body at lower temperature.
Description : The bending of light when a ray of light travels from one medium to another is called.?
Last Answer : Refraction
Description : In what medium sound travels the faster? A. Vacuum B. Solid C. Liquid D. Gas
Last Answer : B. Solid
Description : The _______ is thephysicalpath over which a message travels. A) Protocol B) Medium C) Signal D) All the above
Last Answer : Medium
Description : The characteristic invalid for heat radiation is that it travels : (1) in a straight line (2) in all directions (3) with the speed of light (4) heating the medium through which it passes
Last Answer : with the speed of light
Description : In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft. (a) small (b) medium (c) large (d) any of the above.
Last Answer : (c) large
Description : If a wave travels at a constent speed the greater its wavelength the lower its?
Last Answer : Need answer
Description : A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an (1) Audible wave (2) Infrasonic wave (3) Ultrasonic wave (4) Microwave
Last Answer : (1) Audible wave
Description : What is the term for the ratio of actual velocity at which a signal travels through a line to the speed of light in a vacuum? A. Velocity factor B. Characteristic impedance C. Surge impedance D. Standing wave ratio
Last Answer : A. Velocity factor
Description : When the electric field travels in +x direction and the EM wave is travelling the –y direction, then the magnetic field will be travelling in which direction? a) +z direction b) –z direction c) Either +z or –z direction d) Does not trave
Last Answer : c) Either +z or –z direction
Description : Results in reduction in the power of light wave as it travels down the cable. ∙ A. power loss ∙ B. absorption loss ∙ C. resistive loss ∙ D. heat loss
Last Answer : A. power loss
Description : .As a wave travels down a spring, the amplitude slowly decreases. Why does this occur? A. The law of conservation of energy does not apply to waves. B. The energy is spread out along the entire ... due to friction as the particles in the spring rub against each other. E. all of the above
Last Answer : D. Some energy is lost due to friction as the particles in the spring rub against each other.
Last Answer : Audible wave
Description : The upper pulse rate and information carrying capacity of a cable is limited by a. Pulse shortening b. Attenuation c. Light leakage d. Modal dispersion
Last Answer : d. Modal dispersion
Description : The upper pulse rate and information-carrying capacity of a cable is limited by ∙ A. pulse shortening ∙ B. attenuation ∙ C. light leakage ∙ D. modal dispersion
Last Answer : D. modal dispersion
Description : The upper pulse rate and information carrying capacity of a cable is limited by ∙ a. Pulse shortening ∙ b. Attenuation ∙ c. Light leakage ∙ d. Modal dispersion
Last Answer : ∙ d. Modal dispersion
Description : The depth of penetration of a wave in a lossy dielectric medium increases with
Last Answer : The depth of penetration of a wave in a lossy dielectric medium increases with Increasing wavelength
Description : A car travels at 20 meters per second. What is its rate in kilometers per hour?
Last Answer : 20 m/s (1 kl/1000 m)(3600 s/1 hr) = 72 kilometers an hour -------------------------------
Description : When the nurse observes that the patient's heart rate increases during inspiration and decreases during expiration, the nurse reports that the patient is demonstrating a) sinus dysrhythmia. Sinus dysrhythmia ... occurs when the sinus node regularly creates an impulse at a faster-than-normal rate.
Last Answer : a) sinus dysrhythmia. Sinus dysrhythmia occurs when the sinus node creates an impulse at an irregular rhythm.
Description : State what is the significance of conducting phasing out test on a 3-phase transformer? Explain its procedure with a suitable connection diagram.
Last Answer : -Short primary & secondary winding of other phases expect the one under test. -Connect voltmeter to secondary winding. -A small DC current is circulated through the primary winding through ... . -The test repeated for finding out remaining concerned secondary windings in the same manner.
Description : State any four properties of conducting materials.
Last Answer : Electrical properties of conductivity materials: i) Low resistivity. ii) Low temperature coefficient of resistance. iii) High conductivity. iv) Low heat dissipation. Mechanical properties of ... properties of conductivity materials: i) Adequate resistant to corrosion. ii) Low oxidation.
Description : _______ is used for heating non -conducting materials. (1) Eddy current heating (2) Arc heating (3) Induction heating (4) Dielectric heating
Last Answer : Dielectric heating is used for heating non -conducting materials.
Description : The electric field inside a hollow conducting sphere ________ A) Depends on the diameter of the sphere B) Varies according to the direction of earth’s magnetic poles C) Is zero D) None of these
Last Answer : The electric field inside a hollow conducting sphere Is zero
Description : Once SCR starts conducting a forward current, its gate losses control over (A) Anode circuit voltage only (B) Anode circuit current only (C) Anode circuit voltage and current (D) None of the above
Last Answer : Anode circuit voltage and current
Description : To the nearest rupee, what is the net present value of a replacement project whose cash flows are -Rs.104,000; Rs.34,444; Rs.39,877; Rs.25,000; and Rs.52,800 for years 0 through 4, respectively? The firm has decided to ... -free rate is 6%. A. Rs.15,115 B. Rs.26,798 C. Rs.33,346 D. Rs.48,121
Last Answer : C. Rs.33,346
Description : Name the Cooperative that provides milk, vegetable and pulses at controlled rate decided by government of Delhi: a. Amul b. Kendriya Bhandar c. Mother Dairy d. None of these.
Last Answer : c. Mother Dairy