What optical source radiates light uniformly in all directions? A. Isotropic source B. Lambertian source C. Voltage source D. Ideal source

What optical source radiates light uniformly in all directions?
A. Isotropic source
B. Lambertian source
C. Voltage source
D. Ideal source
by

1 Answer

Answer :

B. Lambertian source
by

Related questions

What antenna radiates equally in all directions? A. Vertical antenna B. isotropic antenna C. Horizontal antenna D. Dipole antenna

Description : What antenna radiates equally in all directions? A. Vertical antenna B. isotropic antenna C. Horizontal antenna D. Dipole antenna

Last Answer : B. isotropic antenna

The sound power level of a jet plane flying at a height of 1 km is 160 dB. What is the maximum sound pressure level on the ground directly below the plane assuming that the aircraft radiates sound equally in all directions? A. 59.1 dB B. 69.1 dB C. 79.1 dB D. 89.1 dB

Description : The sound power level of a jet plane flying at a height of 1 km is 160 dB. What is the maximum sound pressure level on the ground directly below the plane assuming that the aircraft radiates sound equally in all directions? A. 59.1 dB B. 69.1 dB C. 79.1 dB D. 89.1 dB

Last Answer : D. 89.1 dB

What do you call the reflection of a part of incident light at the interface of two media that have different refractive indices? A. Snell’s reflection B. Fresnel reflection C. Lambertian reflection D. Huygen’s reflection

Description : What do you call the reflection of a part of incident light at the interface of two media that have different refractive indices? A. Snell’s reflection B. Fresnel reflection C. Lambertian reflection D. Huygen’s reflection

Last Answer : B. Fresnel reflection

A radiating source that radiates energy equally in all directions is known as what type of radiator?

Description : A radiating source that radiates energy equally in all directions is known as what type of radiator?

Last Answer : Isotropic radiator.

ECE Board Exam March 1996 EIRP stands for _______________. A. effective isotropic refracted power B. effective and ideal radiated power C. effective isotropic reflected power D. effective isotropic radiated power

Description : ECE Board Exam March 1996 EIRP stands for _______________. A. effective isotropic refracted power B. effective and ideal radiated power C. effective isotropic reflected power D. effective isotropic radiated power

Last Answer : D. effective isotropic radiated power

Any energy which radiates in the form of radio waves, infrared waves, light waves, x-rays, etc. A. Radiant energy B. Electromagnetic C. Heat D. Ultraviolet

Description : Any energy which radiates in the form of radio waves, infrared waves, light waves, x-rays, etc. A. Radiant energy B. Electromagnetic C. Heat D. Ultraviolet

Last Answer : B. Electromagnetic

What type of antenna radiates in and receives energy from all directions at once?

Description : What type of antenna radiates in and receives energy from all directions at once?

Last Answer : Omnidirectional.

A simple half-wavelength antenna radiates the strongest signal A. at 45 degrees to its axis B. parallel to its axis C. at right angles to its axis D. at 60 degrees to its axis

Description : A simple half-wavelength antenna radiates the strongest signal A. at 45 degrees to its axis B. parallel to its axis C. at right angles to its axis D. at 60 degrees to its axis

Last Answer : C. at right angles to its axis

What is the front-to-back ratio of an antenna which radiates 500 watts in a northernly direction and 50 watts in a southernly direction? A. 25000 dB B. 10 dB C. 100 dB D. 20 dB

Description : What is the front-to-back ratio of an antenna which radiates 500 watts in a northernly direction and 50 watts in a southernly direction? A. 25000 dB B. 10 dB C. 100 dB D. 20 dB

Last Answer : B. 10 dB

The antenna radiates _____ polarized waves when the transmitter antenna is horizontally installed. A. Vertically B. negatively C. horizontally D. circularly

Description : The antenna radiates _____ polarized waves when the transmitter antenna is horizontally installed. A. Vertically B. negatively C. horizontally D. circularly

Last Answer : C. horizontally

Which antenna radiates an omnidirectional pattern in the horizontal plane with vertical polarization? A. Marconi antenna B. Discone antenna C. Horn antenna D. Helical antenna

Description : Which antenna radiates an omnidirectional pattern in the horizontal plane with vertical polarization? A. Marconi antenna B. Discone antenna C. Horn antenna D. Helical antenna

Last Answer : A. Marconi antenna

A device that radiates electromagnetic energy and or intercepts electromagnetic radation. A. Antenna B. Transmitter C. Transmission line D. Transceiver

Description : A device that radiates electromagnetic energy and or intercepts electromagnetic radation. A. Antenna B. Transmitter C. Transmission line D. Transceiver

Last Answer : A. Antenna

Is a non-coherent light source foe optical communications system. a. ILD b. LED c. APD d. PIN Diode

Description : Is a non-coherent light source foe optical communications system. a. ILD b. LED c. APD d. PIN Diode

Last Answer : b. LED

A non-coherent light source for optical communications system. A. PIN Diode B. ILD C. APD D. LED

Description : A non-coherent light source for optical communications system. A. PIN Diode B. ILD C. APD D. LED

Last Answer : D. LED

In isotropic turbulence, the __________ are equal to each other. (A) Temporal velocity components (B) Mean square of velocity fluctuations in the three co-ordinate directions (C) Root mean square of velocity fluctuations in the three co-ordinate directions (D) None of these

Description : In isotropic turbulence, the __________ are equal to each other. (A) Temporal velocity components (B) Mean square of velocity fluctuations in the three co-ordinate directions (C) Root mean square of velocity fluctuations in the three co-ordinate directions (D) None of these

Last Answer : (B) Mean square of velocity fluctuations in the three co-ordinate directions

The materials which have the same elastic properties in all directions, are called (A) Isotropic (B) Brittle (C) Homogeneous (D) Hard

Description : The materials which have the same elastic properties in all directions, are called  (A) Isotropic  (B) Brittle  (C) Homogeneous  (D) Hard 

Last Answer : (A) Isotropic 

Isotropic materials have the same __________ in all directions. (A) Induced stresses (B) Density (C) Elastic properties (D) Thermal properties

Description : Isotropic materials have the same __________ in all directions. (A) Induced stresses (B) Density (C) Elastic properties (D) Thermal properties

Last Answer : C) Elastic properties

While propagating through homogeneous, isotropic media, (A) Directions of both the fields are orthogonal (B) Both the fields are at right angles to the direction of propagation (C) Both (a) and (b) (D) Neither (a) nor (b)

Description : While propagating through homogeneous, isotropic media, (A) Directions of both the fields are orthogonal (B) Both the fields are at right angles to the direction of propagation (C) Both (a) and (b) (D) Neither (a) nor (b)

Last Answer : Answer: Option C

In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the a. normal stress remains constant in all directions b. normal stress varies linearly in the material c. elastic constants are same in all the directions d. elastic constants varies linearly in the material

Description : In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the a. normal stress remains constant in all directions b. ... c. elastic constants are same in all the directions d. elastic constants varies linearly in the material

Last Answer : c. elastic constants are same in all the directions

If a material has identical properties in all directions, it is called (a) Elastic (b) Plastic (c) Isotropic (d) Homogeneous

Description : If a material has identical properties in all directions, it is called (a) Elastic (b) Plastic (c) Isotropic (d) Homogeneous

Last Answer : (c) Isotropic

It is useful to refer to an isotropic radiator. A. when comparing the gains of directional antennas B. when testing a transmission line for standing wave ratio C. when (in the northern hemisphere) directing the transmission D. when using a dummy load to tune a transmitter

Description : It is useful to refer to an isotropic radiator. A. when comparing the gains of directional antennas B. when testing a transmission line for standing wave ratio C. when (in the northern hemisphere) directing the transmission D. when using a dummy load to tune a transmitter

Last Answer : A. when comparing the gains of directional antennas

What is the gain of an antenna over a half-wavelength dipole when it has 6 dB gain over an isotropic radiator? A. 6.0 dB B. 8.1 dB C. 3.9 dB D. 10.0 dB

Description : What is the gain of an antenna over a half-wavelength dipole when it has 6 dB gain over an isotropic radiator? A. 6.0 dB B. 8.1 dB C. 3.9 dB D. 10.0 dB

Last Answer : C. 3.9 dB

A theoretical reference antenna that provides a comparison for antenna measurements. A. Marconi antenna B. Isotropic radiator C. Yagi-Uda array D. Whip antenna

Description : A theoretical reference antenna that provides a comparison for antenna measurements. A. Marconi antenna B. Isotropic radiator C. Yagi-Uda array D. Whip antenna

Last Answer : B. Isotropic radiator

An isotropic radiator is A. in the northern hemisphere B. an antenna high enough in the air C. an antenna whose directive pattern is substantially incredible D. a hypothetical, omnidirectional antenna

Description : An isotropic radiator is A. in the northern hemisphere B. an antenna high enough in the air C. an antenna whose directive pattern is substantially incredible D. a hypothetical, omnidirectional antenna

Last Answer : D. a hypothetical, omnidirectional antenna

The directivity pattern of an isotropic radiator is A. a figure-8 B. a sphere C. a unidirectional cardioid D. a parabola

Description : The directivity pattern of an isotropic radiator is A. a figure-8 B. a sphere C. a unidirectional cardioid D. a parabola

Last Answer : B. a sphere

Which antenna is not properly terminated? A. Resonant B. Non-resonant C. Isotropic D. Whip

Description : Which antenna is not properly terminated? A. Resonant B. Non-resonant C. Isotropic D. Whip

Last Answer : A. Resonant

Which of the following antennas is used for testing and adjusting a transmitter for proper modulation, amplifier operation and frequency accuracy? A. Elementary B. Real C. Isotropic D. Dummy

Description : Which of the following antennas is used for testing and adjusting a transmitter for proper modulation, amplifier operation and frequency accuracy? A. Elementary B. Real C. Isotropic D. Dummy

Last Answer : D. Dummy

What is the gain of isotropic antenna? A. 10 B. 1 C. 10 D. 100

Description : What is the gain of isotropic antenna? A. 10 B. 1 C. 10 D. 100

Last Answer : B. 1

An antenna with unity gain A. Rhombic B. Half-wave dipole C. Isotropic D. Whip

Description : An antenna with unity gain A. Rhombic B. Half-wave dipole C. Isotropic D. Whip

Last Answer : C. Isotropic

In testing transmitter to prevent interfering with other stations, which type of antenna must be used? A. Void antenna B. Dummy antenna C. Hertzian antenna D. Isotropic antenna

Description : In testing transmitter to prevent interfering with other stations, which type of antenna must be used? A. Void antenna B. Dummy antenna C. Hertzian antenna D. Isotropic antenna

Last Answer : B. Dummy antenna

What is the gain of the Hertzian dipole over isotropic antenna? A. 1.64 dB B. 2.15 dB C. 1.76 dB D. 1.55 dB

Description : What is the gain of the Hertzian dipole over isotropic antenna? A. 1.64 dB B. 2.15 dB C. 1.76 dB D. 1.55 dB

Last Answer : C. 1.76 dB

Which of the following antennas require good grounding? A. Yagi antenna B. Hertz antenna C. Marconi antenna D. Isotropic antenna

Description : Which of the following antennas require good grounding? A. Yagi antenna B. Hertz antenna C. Marconi antenna D. Isotropic antenna

Last Answer : C. Marconi antenna

The product of antenna input power and the antenna power gain expressed in kW is called __. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Description : The product of antenna input power and the antenna power gain expressed in kW is called __. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Last Answer : A. Effective Radiated Power (ERP)

The product of the radiated RF power of a transmitter and the gain of the antenna system in a given direction relative to an isotropic radiator is called ____. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Description : The product of the radiated RF power of a transmitter and the gain of the antenna system in a given direction relative to an isotropic radiator is called ____. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Last Answer : B. Effective Isotropic Radiated Power (EIRP)

When is it useful to refer to an isotropic radiator? A. When comparing the gains of directional antennas B. When testing a transmission line for standing wave ratio C. When (in the northern hemisphere) directing the transmission in a southerly direction D. When using a dummy load to tune a transmitter

Description : When is it useful to refer to an isotropic radiator? A. When comparing the gains of directional antennas B. When testing a transmission line for standing wave ratio C. When (in the northern ... ) directing the transmission in a southerly direction D. When using a dummy load to tune a transmitter

Last Answer : A. When comparing the gains of directional antennas

Antenna which is not properly terminated A. Isotropic B. Non-resonant C. Whip D. Resonant

Description : Antenna which is not properly terminated A. Isotropic B. Non-resonant C. Whip D. Resonant

Last Answer : D. Resonant

An antenna that can only receive a television signal. A. Isotropic antenna B. TVRO C. Reference antenna D. Yagi antenna

Description : An antenna that can only receive a television signal. A. Isotropic antenna B. TVRO C. Reference antenna D. Yagi antenna

Last Answer : B. TVRO

Unity gain antenna A. Isotropic B. Rhombic C. Half-wave dipole D. Dummy

Description : Unity gain antenna A. Isotropic B. Rhombic C. Half-wave dipole D. Dummy

Last Answer : A. Isotropic

Gain of an isotropic antenna A. -1 dB B. 1 dB C. 0 dB D. 2 dB

Description : Gain of an isotropic antenna A. -1 dB B. 1 dB C. 0 dB D. 2 dB

Last Answer : C. 0 dB

ECE Board Exam March 1996 A type of an underground antenna is a/an __________ antenna. A. Hertz B. isotropic C. parabolic D. Marconi

Description : ECE Board Exam March 1996 A type of an underground antenna is a/an __________ antenna. A. Hertz B. isotropic C. parabolic D. Marconi

Last Answer : A. Hertz

ECE Board Exam March 1996 The standard reference antenna for the directive gain is ___________A. elementary doublet B. isotropic antenna C. half-wave dipole D. infinitesimal dipole

Description : ECE Board Exam March 1996 The standard reference antenna for the directive gain is ___________. A. elementary doublet B. isotropic antenna C. half-wave dipole D. infinitesimal dipole

Last Answer : B. isotropic antenna

Indicate the false statement. Noise figure is defined as A. the ratio of the S/N power supplied at the input terminal of a receiver or amplifier to the S/N power supplied to the output or load resistor B. noise factor expressed in decibels C. an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signal D. S/N of an ideal system divided by S/N at the output of the receiver or amplifier under test, both working at the same temperature over the same bandwidth and fed from the same source

Description : Indicate the false statement. Noise figure is defined as A. the ratio of the S/N power supplied at the input terminal of a receiver or amplifier to the S/N power supplied to the output or ... under test, both working at the same temperature over the same bandwidth and fed from the same source

Last Answer : C. an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals

What noise is a transient short-duration disturbance distributed essentially uniformly over the useful passband of a transmission system? A. Flicker noise B. Transit-time noise C. Shot noise D. Impulse noise

Description : What noise is a transient short-duration disturbance distributed essentially uniformly over the useful passband of a transmission system? A. Flicker noise B. Transit-time noise C. Shot noise D. Impulse noise

Last Answer : D. Impulse noise

Which of the following contributes to the broadening of laser emission bandwidth? a. Doppler shift of moving atoms and molecules b. Amplification within the laser medium c. Coherence of the laser light d. Optical pumping of the laser transition

Description : Which of the following contributes to the broadening of laser emission bandwidth? a. Doppler shift of moving atoms and molecules b. Amplification within the laser medium c. Coherence of the laser light d. Optical pumping of the laser transition

Last Answer : a. Doppler shift of moving atoms and molecules

What is a specific path the light takes in an optical fiber corresponding to a certain angle and number of reflection a. Mode b. Grade c. Numerical Aperture d. Dispersion

Description : What is a specific path the light takes in an optical fiber corresponding to a certain angle and number of reflection a. Mode b. Grade c. Numerical Aperture d. Dispersion

Last Answer : a. Mode

Is the different angle of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitted. a. Acceptance angle b. Modes c. Sensors d. Aperture

Description : Is the different angle of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitted. a. Acceptance angle b. Modes c. Sensors d. Aperture

Last Answer : b. Modes

What law does a light traveling in air optical fiber follow? A. Millman B. Snell’s C. Maxwell D. Huygen

Description : What law does a light traveling in air optical fiber follow? A. Millman B. Snell’s C. Maxwell D. Huygen

Last Answer : B. Snell’s

A device that reduces the intensity of light in fiber optics communication systems. A. Reducer B. Quality factor C. Optical attenuator D. Compressor

Description : A device that reduces the intensity of light in fiber optics communication systems. A. Reducer B. Quality factor C. Optical attenuator D. Compressor

Last Answer : C. Optical attenuator

The different angles of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitter is known as ________. A. refraction B. sensor C. mode D. emitter

Description : The different angles of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitter is known as ________. A. refraction B. sensor C. mode D. emitter

Last Answer : C. mode

A radiating source that radiates energy stronger in one direction than another is known as what type of radiator?

Description : A radiating source that radiates energy stronger in one direction than another is known as what type of radiator?

Last Answer : Anisotropic radiator.