Description : How does temperature inversion affect radio transmission?
Last Answer : It can cause vhf and uhf transmission to be propagated far beyond normal line-of-sight distances.
Description : When referring to spectrum analyzers, what is meant by the term resolving signals?
Last Answer : The ability of the analyzer to discriminate between display signals of slightly different frequencies.
Description : Which radio frequency bands use the tropospheric scattering principle for propagation of radio waves?
Last Answer : Vhf and above
Description : How does fog affect radio waves at frequencies above 2 gigahertz?
Last Answer : It can cause attenuation by absorbtion.
Description : How do raindrops affect radio waves?
Last Answer : They can cause attenuation by scattering.
Description : What are the two main sources of emi with which radio waves must compete?
Last Answer : Natural and man-made interference.
Description : There is a maximum frequency at which vertically transmitted radio waves can be refracted back to Earth. What is this maximum frequency called?
Last Answer : Critical frequency.
Description : Which layer of the atmosphere has relatively little effect on radio waves?
Last Answer : Stratosphere.
Description : What is one of the major reasons for the fading of radio waves which have been reflected from a surface?
Last Answer : Shifting in the phase relationships of the wave.
Description : What is meant by referring to electromagnetic waves as having circular polarization? A. The electric field is bent into a circular shape. B. The electric field rotates C. The electromagnetic wave continues to circle the earth D. The electromagnetic wave has been generated by a quad antenna
Last Answer : B. The electric field rotates
Description : What is meant by referring to electromagnetic waves as horizontally polarized? A. The electric field is parallel to the earth. B. The magnetic field is parallel to the earth. C. Both the electric and magnetic fields are horizontal D. Both the electric and magnetic fields are vertical
Last Answer : A. The electric field is parallel to the earth.
Description : What is meant by referring to electromagnetic waves as horizontally polarized? A. The electric field is parallel to the earth B. Both the electric and magnetic fields are vertical C. Both the electric and magnetic fields are horizontal D. The magnetic fields is parallel to the earth
Last Answer : A. The electric field is parallel to the earth
Description : What are the three units of measure most commonly used when referring to af power measurements?
Last Answer : DB, dBm, and vu.
Description : What is the term for multiple reflections of sound waves?
Last Answer : Reverberation.
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 : Ozone layer in the outer atmosphere helps us in – (1) reflecting radio waves and makes radio communication possible (2) regulating he temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations
Last Answer : (4) absorbing U-V radiations Explanation: The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97- 99% of the Sun's medium-frequency ultraviolet light.
Description : Pick out the wrong statement (A) The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone (B) Mesosphere is characterised by very low atmospheric ... radio waves used in the long distance radio communication are reflected back to earth by stratosphere
Last Answer : (D) The radio waves used in the long distance radio communication are reflected back to earth by stratosphere
Description : Match List I (Layers of Atmosphere) and List II (Characteristics) and select the correct answer using the code given below. L ist I L i st I I (L ayer of (Char acter ist ics) At mospher e) A. Ionosphere I. Contains Ozone B. ... D-III (3) A-II, B-III, C-I, D-IV (4) A-III, B-I, C-IV, D-II
Last Answer : 2) A-II, B-I, C-IV, D-III
Description : Ozone layer in the outer atmosphere helps us in (1) reflecting radio waves and makes radio communication possible (2) regulating the temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations
Last Answer : absorbing U-V radiations
Description : When you use the term on desktop are you referring to the desktop version on mobile?
Last Answer : What you are saying is correct.
Description : What is meant by the term 'business' when referring to the three role-players in the economy?
Last Answer : Need answer
Description : Callus is a term usually referring to: a. The tissue on the collar of a limb b. The first tissue develops on a cut surface just before the root formation iniates. c. Deformed growth on plant limbs d. A disease of plant leaves and limbs
Last Answer : The first tissue develops on a cut surface just before the root formation iniates
Description : When a term is used in its entire extent referring to to the objects denoted by the term, that term is said to be___________. A) Undistributed B) Excluded C) Distributed D) Verified.
Last Answer : C) Distributed
Description : How to reduce effect of temperature inversion?
Last Answer : Welcome to fluther. This sounds like a homework question and we don’t answer them here but we’ll point you in a direction to look. Are you talking gas, fluid, or solid?
Description : Above the inversion temperature, `mu` (J.T. coefficient)
Last Answer : Above the inversion temperature, `mu` (J.T. coefficient) A. Is positive B. Is zero C. Is negative D. Depends on the gas
Description : Inversion temperature of helium is very low. So when helium is allowed to expand into vacuum it gets
Last Answer : Inversion temperature of helium is very low. So when helium is allowed to expand into vacuum it ... Heated C. Neither cooled, nor heated D. Liquified
Description : Atmospheric temperature increasing at the higher altitudes is called – (1) Radiation (2) Inversion (3) Conduction (4) Convection
Last Answer : (2) Inversion Explanation: The reversal of the normal behaviour of temperature in the troposphere in which a layer of cool air at the surface is overlain by a layer of warmer ... as temperature inversion. Inversions play an important role in determining cloud forms, precipitation, and visibility.
Description : What do you call the increase of temperature with height? A. Temperature inversion B. Normal inversion C. Ducting D. Superrefraction
Last Answer : A. Temperature inversion
Description : Temperature inversion is
Last Answer : Positive Lapse Rate
Description : ____ is a weather-based indicator for assessing crop development [a] Growing Degree Days [b] Thermal Death Point [c] Sun Clad [d] Heat Units [e] Temperature Inversion
Last Answer : [c] Sun Clad
Description : The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature. (A) Boyle (B) Inversion (C) Critical (D) Reduced
Last Answer : (A) Boyle
Description : The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature. (A) Critical (B) Boyle (C) Inversion (D) Reduced
Last Answer : (B) Boyle
Description : All gases above its inversion temperature, in a throttling process will show (A) A heating effect (B) No change in temperature (C) A cooling effect (D) Either (A) or (C)
Last Answer : (A) A heating effect
Description : Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature. (A) Below (B) At (C) Above (D) Either 'b' or 'c'
Last Answer : A) Below
Description : Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is (A) 0 (B) ∞ (C) +ve (D) -ve
Last Answer : (A) 0
Description : Which one is true for a throttling process? (A) A gas may have more than one inversion temperatures (B) The inversion temperature is different for different gases (C) The inversion ... gases (D) The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
Last Answer : (B) The inversion temperature is different for different gases
Description : The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the (A) Critical point (B) Curie temperature (C) Inversion temperature (D) Eutectic temperature
Last Answer : (B) Curie temperature
Description : The radiation emitted by a body as a result of its temperature. a. Blackbody Radiation b. Thermal Inversion c. Thermionic Inversion d. Thermal Radiation
Last Answer : Thermal Radiation
Description : An inversion is: a. A decrease of pressure with height b. A decrease of temperature with height c. An increase of temperature with height d. An increase of pressure with height
Last Answer : c. An increase of temperature with height
Description : Which of the following does NOT form as a result o a low level temperature inversion? w) smog x) sleet y) tornado z) fog
Last Answer : ANSWER: Y -- TORNADO
Description : Atmospheric temperature increasing at the higher altitudes is called (1) Radiation (2) Inversion (3) Conduction (4) Convection
Last Answer : Inversion
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 type circuit is used to produce square or rectangular waves?
Last Answer : Multivibrator.
Description : Sound waves transmitted from a source are sometimes weak when they reach the detector. What instrument is needed to boost the weak signal?
Last Answer : An amplifier.
Description : What are some examples of transverse waves?
Last Answer : Radio waves, light waves, and heat waves.
Description : . A non-resonant line is a line that has no standing waves of current and voltage on it and is considered to be flat. Why is this true?
Last Answer : The load impedance of such a line is equal to Z0.
Description : which waveforms on the left have a resultant wave of zero, and what is indicated by these waves?
Last Answer : 2 and 6 have zero resultant wave and they indicate that the incident and reflected waves are 180 degrees out of phase at all parts.
Description : Two types of waves are formed on a transmission line. What names are given to these waves?
Last Answer : Incident waves from generator to load. Reflected waves from load back to generator.