Friis Transmission Equation Online Exam Quiz

Friis Transmission Equation GK Quiz. Question and Answers related to Friis Transmission Equation. MCQ (Multiple Choice Questions with answers about Friis Transmission Equation

An ideal source in which the power is radiated equally in all directions is called as __ radiator.


A : Isotropic

B : Omni-directional

C : Directional

D : Transducer

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Assume two similar antennas for transmitting and receiving. If the operating frequency gets reduced by 3 times then the received power gets ___


A : increases by factor 3

B : decreases by factor 3

C : increases by factor 9

D : decreases by factor 9

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Find the effective length of a receiving antenna with open circuit voltage 1V and incident electric field 200mV/m?


A : 0.2m

B : 50m

C : 5m

D : 5cm

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Find the power received by the receiving antenna if it is placed at a distance of 20m from the transmitting antenna which is radiating 50W power at a frequency 900MHz and are made-up of half-wave dipoles.


A : 23.65?W

B : 2.365?W

C : 236.5?W

D : 4.73?W

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For an isotropic source, Radiation intensity will be ___ on ? and __ on ?.


A : Dependent, independent

B : Independent, independent

C : Independent, dependent

D : Dependent, dependent

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If the distance between the transmitting and receiving antenna is decreased by a factor 2 while other factors remain same, then the new power received by the antenna ___


A : increases by factor 2

B : decreases by factor 2

C : increases by factor 4

D : decreases by factor 4

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In Isotropic radiation, which of the following vector component is absent in pointing vector?


A : \widehat{a_r}

B : \widehat{a_\theta}

C : \widehat{a_\emptyset}

D : Both \widehat{a_\theta} and \widehat{a_\emptyset}

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Let's assume a transmitting antenna having gain 10dB is placed at a distance of 100m from the receiving antenna and radiates a power of 5W. Find the gain of the receiving antenna in dB when the received power is 150?W and transmitter frequency 500MHz?


A : 1.31dB

B : 1.19dB

C : 11.19dB

D : 13.16dB

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Power received by the antenna when one antenna is horizontally polarized and the other is vertically polarized is ___


A : 1

B : 0

C : \frac{P_r}{P_t} = \frac{G_t G_r ?^2}{(4?R)^2}

D : \frac{P_r}{P_t} = \frac{G_t G_r ?^2}{2(4?R)^2}

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What is the amount of Electric field present at a distance of 10km for an isotropic radiator with radiating power 3kW?


A : 30mV/m

B : 60mV/m

C : 15mV/m

D : 10mV/m

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Antenna Bandwidth more Online Exam Quiz

Antenna Noise Temperature


Directive Gain


Effective Aperture

Isotropic Radiators

Power Gain

Power Radiation from Half Wave Dipole

Radiation Pattern

Radiation Resistance