Recent questions tagged electromagnetic

The skin depth of the wave having a frequency of 3MHz and a velocity of 12 m/s is a) 2 b) 3 c) 4 d) 6

Description : The skin depth of the wave having a frequency of 3MHz and a velocity of 12 m/s is a) 2 b) 3 c) 4 d) 6

Last Answer : c) 4

The resultant electric field of two components in the x and y direction having amplitudes 6 and 8 respectively is a) 100 b) 36 c) 64 d) 10

Description : The resultant electric field of two components in the x and y direction having amplitudes 6 and 8 respectively is a) 100 b) 36 c) 64 d) 10

Last Answer : d) 10

A perfect conductor acts as a a) Perfect transmitter b) Perfect reflector c) Bad transmitter d) Bad reflector

Description : A perfect conductor acts as a a) Perfect transmitter b) Perfect reflector c) Bad transmitter d) Bad reflector

Last Answer : b) Perfect reflector

A perfect dielectric acts as a a) Perfect transmitter b) Perfect reflector c) Bad transmitter d) Bad reflector

Description : A perfect dielectric acts as a a) Perfect transmitter b) Perfect reflector c) Bad transmitter d) Bad reflector

Last Answer : a) Perfect transmitter

The relation between the skin depth and frequency is given by a) Skin depth α f b) Skin depth α 1/f c) Skin depth α √f d) Skin depth α 1/√f

Description : The relation between the skin depth and frequency is given by a) Skin depth α f b) Skin depth α 1/f c) Skin depth α √f d) Skin depth α 1/√f

Last Answer : d) Skin depth α 1/√f

The skin depth is used to find which parameter? a) DC resistance b) AC resistance c) Permittivity d) Potential

Description : The skin depth is used to find which parameter? a) DC resistance b) AC resistance c) Permittivity d) Potential

Last Answer : b) AC resistance

The effective skin resistance of a material with conductivity 120 and skin depth of 2μm is a) 4.16 kilo ohm b) 4.16 mega ohm c) 41.6 kilo ohm d) 41.6 mega ohm

Description : The effective skin resistance of a material with conductivity 120 and skin depth of 2μm is a) 4.16 kilo ohm b) 4.16 mega ohm c) 41.6 kilo ohm d) 41.6 mega ohm

Last Answer : a) 4.16 kilo ohm

Calculate the skin depth of a conductor, having a conductivity of 200 units. The wave frequency is 10 GHz in air. a) 355.8 b) 3.558 c) 35.58 d) 0.3558

Description : Calculate the skin depth of a conductor, having a conductivity of 200 units. The wave frequency is 10 GHz in air. a) 355.8 b) 3.558 c) 35.58 d) 0.3558

Last Answer : a) 355.8

The attenuation constant is 0.5 units. The skin depth will be a) 0.5 b) 0.25 c) 2 d) 4

Description : The attenuation constant is 0.5 units. The skin depth will be a) 0.5 b) 0.25 c) 2 d) 4

Last Answer : c) 2

The skin depth is calculated from the amplitude of the wave. State true/false a) True b) False

Description : The skin depth is calculated from the amplitude of the wave. State true/false a) True b) False

Last Answer : a) True

The skin depth is measured in a) Meter b) Millimetre c) Centimetre d) Micrometer

Description : The skin depth is measured in a) Meter b) Millimetre c) Centimetre d) Micrometer

Last Answer : d) Micrometer

The skin effect is a phenomenon observed in a) Insulators b) Dielectrics c) Conductors d) Semiconductors

Description : The skin effect is a phenomenon observed in a) Insulators b) Dielectrics c) Conductors d) Semiconductors

Last Answer : c) Conductors

The current reflection coefficient of a line with voltage reflection coefficient of 0.65 is given by a) 0 b) 0.65 c) -0.65 d) 0.35

Description : The current reflection coefficient of a line with voltage reflection coefficient of 0.65 is given by a) 0 b) 0.65 c) -0.65 d) 0.35

Last Answer : c) -0.65

The standing wave ratio of short circuited and open circuited lines will be a) 0 b) 1 c) -1 d) ∞

Description : The standing wave ratio of short circuited and open circuited lines will be a) 0 b) 1 c) -1 d) ∞

Last Answer : d) ∞

The minimum impedance of a 75 ohm transmission line with a SWR of 2.5 is a) 100 b) 50 c) 25 d) 30

Description : The minimum impedance of a 75 ohm transmission line with a SWR of 2.5 is a) 100 b) 50 c) 25 d) 30

Last Answer : d) 30

The maximum impedance of a 50 ohm transmission line with SWR of 3 is a) 50/3 b) 3/50 c) 150 d) 450

Description : The maximum impedance of a 50 ohm transmission line with SWR of 3 is a) 50/3 b) 3/50 c) 150 d) 450

Last Answer : c) 150

For matched line, the standing wave ratio will be a) 0 b) ∞ c) -1 d) 1

Description : For matched line, the standing wave ratio will be a) 0 b) ∞ c) -1 d) 1

Last Answer : d) 1

The range of the standing wave ratio is a) 0 < S < 1 b) -1 < S < 1 c) 1 < S < ∞ d) 0 < S < ∞

Description : The range of the standing wave ratio is a) 0 < S < 1 b) -1 < S < 1 c) 1 < S < ∞ d) 0 < S < ∞

Last Answer : c) 1 < S < ∞

Find the reflection coefficient of the wave with SWR of 3.5. a) 0.55 b) 0.23 c) 0.48 d) 0.68

Description : Find the reflection coefficient of the wave with SWR of 3.5. a) 0.55 b) 0.23 c) 0.48 d) 0.68

Last Answer : a) 0.55

Find the standing wave ratio, when a load impedance of 250 ohm is connected to a 75 ohm line. a) 0.3 b) 75 c) 250 d) 3.33

Description : Find the standing wave ratio, when a load impedance of 250 ohm is connected to a 75 ohm line. a) 0.3 b) 75 c) 250 d) 3.33

Last Answer : d) 3.33

The maxima and minima voltage of the standing wave are 6 and 2 respectively. The standing wave ratio is a) 2 b) 3 c) 1/2 d) 4

Description : The maxima and minima voltage of the standing wave are 6 and 2 respectively. The standing wave ratio is a) 2 b) 3 c) 1/2 d) 4

Last Answer : b) 3

Given that the reflection coefficient is 0.6. Find the SWR. a) 2 b) 4 c) 6 d) 8

Description : Given that the reflection coefficient is 0.6. Find the SWR. a) 2 b) 4 c) 6 d) 8

Last Answer : b) 4

Standing wave ratio is defined as the a) Ratio of voltage maxima to voltage minima b) Ratio of current maxima to current minima c) Product of voltage maxima and voltage minima d) Product of current maxima and current minima

Description : Standing wave ratio is defined as the a) Ratio of voltage maxima to voltage minima b) Ratio of current maxima to current minima c) Product of voltage maxima and voltage minima d) Product of current maxima and current minima

Last Answer : a) Ratio of voltage maxima to voltage minima

Standing waves occurs due to a) Impedance match b) Impedance mismatch c) Reflection d) Transmission

Description : Standing waves occurs due to a) Impedance match b) Impedance mismatch c) Reflection d) Transmission

Last Answer : b) Impedance mismatch

The phase constant of a wave propagation with frequency of 35 radian/sec and time delay of 7.5 sec is a) 4.66 b) 262.5 c) 46.6 d) 26.25

Description : The phase constant of a wave propagation with frequency of 35 radian/sec and time delay of 7.5 sec is a) 4.66 b) 262.5 c) 46.6 d) 26.25

Last Answer : b) 262.5

Calculate the transmission coefficient of a wave with a reflection coefficient of 0.6 a) 0.6 b) 1 c) 0 d) 0.4

Description : Calculate the transmission coefficient of a wave with a reflection coefficient of 0.6 a) 0.6 b) 1 c) 0 d) 0.4

Last Answer : d) 0.4

Find the relative permittivity of the medium having a refractive index of 1.6 a) 0.4 b) 2.56 c) 3.2 d) 4.8

Description : Find the relative permittivity of the medium having a refractive index of 1.6 a) 0.4 b) 2.56 c) 3.2 d) 4.8

Last Answer : b) 2.56

The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is a) 0 b) 1 c) 10 d) 5

Description : The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is a) 0 b) 1 c) 10 d) 5

Last Answer : b) 1

Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units. a) 2.5 b) 0.4 c) 0.8 d) 1.2

Description : Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units. a) 2.5 b) 0.4 c) 0.8 d) 1.2

Last Answer : b) 0.4

The Brewster angle is valid for which type of polarisation? a) S polarised b) P polarised c) Elliptical d) Linear

Description : The Brewster angle is valid for which type of polarisation? a) S polarised b) P polarised c) Elliptical d) Linear

Last Answer : b) P polarised

The group delay of a wave with phase constant 2.5 units and frequency of 1.2 radian/sec is a) 3.7 b) 1.3 c) 3 d) 2.08

Description : The group delay of a wave with phase constant 2.5 units and frequency of 1.2 radian/sec is a) 3.7 b) 1.3 c) 3 d) 2.08

Last Answer : d) 2.08

In P polarisation, the electric field lies in the same plane as the interface. State True/False. a) True b) False

Description : In P polarisation, the electric field lies in the same plane as the interface. State True/False. a) True b) False

Last Answer : a) True

In S polarisation, the electric field lies in the plane perpendicular to that of the interface. State True/False a) True b) False

Description : In S polarisation, the electric field lies in the plane perpendicular to that of the interface. State True/False a) True b) False

Last Answer : a) True

The resultant electric field of a wave with Ex = 3 and Ey = 4 will be a) 7 b) 1 c) 25 d) 5

Description : The resultant electric field of a wave with Ex = 3 and Ey = 4 will be a) 7 b) 1 c) 25 d) 5

Last Answer : d) 5

Identify the polarisation of the wave given that, Ex = 2 sin wt and Ey = 3 sin wt. a) Linear b) Elliptical c) Circular d) Parallel

Description : Identify the polarisation of the wave given that, Ex = 2 sin wt and Ey = 3 sin wt. a) Linear b) Elliptical c) Circular d) Parallel

Last Answer : a) Linear

When the polarisation of the receiving antenna is unknown, to ensure that it receives atleast half the power, the transmitted wave should be a) Linearly polarised b) Elliptically polarised c) Circularly polarised d) Normally polarised

Description : When the polarisation of the receiving antenna is unknown, to ensure that it receives atleast half the power, the transmitted wave should be a) Linearly polarised b) Elliptically polarised c) Circularly polarised d) Normally polarised

Last Answer : c) Circularly polarised

The Snell law is applicable for perpendicular polarisation and the Brewster law is applicable for parallel polarisation. State True/False. a) True b) False

Description : The Snell law is applicable for perpendicular polarisation and the Brewster law is applicable for parallel polarisation. State True/False. a) True b) False

Last Answer : a) True

Identify the polarisation of the wave given that, Ex = 2 cos wt and Ey = cos wt. a) Elliptical b) Circular c) Parallel d) Linear

Description : Identify the polarisation of the wave given that, Ex = 2 cos wt and Ey = cos wt. a) Elliptical b) Circular c) Parallel d) Linear

Last Answer : d) Linear

For a non-zero Ex component and zero Ey component, the polarisation is a) Parallel b) Perpendicular c) Elliptical d) Circular

Description : For a non-zero Ex component and zero Ey component, the polarisation is a) Parallel b) Perpendicular c) Elliptical d) Circular

Last Answer : a) Parallel

Identify the polarisation of the wave given, Ex = cos wt and Ey = sin wt. The phase difference is -90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Description : Identify the polarisation of the wave given, Ex = cos wt and Ey = sin wt. The phase difference is -90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Last Answer : b) Right hand circularly polarised

Identify the polarisation of the wave given, Ex = 2 cos wt and Ey = 2 sin wt. The phase difference is +90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Description : Identify the polarisation of the wave given, Ex = 2 cos wt and Ey = 2 sin wt. The phase difference is +90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Last Answer : a) Left hand circularly polarised

Identify the polarisation of the wave given, Ex = 2 cos wt and Ey = sin wt. The phase difference is -90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Description : Identify the polarisation of the wave given, Ex = 2 cos wt and Ey = sin wt. The phase difference is -90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Last Answer : d) Right hand elliptically polarised

Identify the polarisation of the wave given, Ex = Exo cos wt and Ey = Eyo sin wt. The phase difference is +90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Description : Identify the polarisation of the wave given, Ex = Exo cos wt and Ey = Eyo sin wt. The phase difference is +90 0 . a) Left hand circularly polarised b) Right hand circularly polarised c) Left hand elliptically polarised d) Right hand elliptically polarised

Last Answer : c) Left hand elliptically polarised

When the Ex and Ey components of a wave are not same, the polarisation will be a) Linear b) Elliptical c) Circular d) Parallel

Description : When the Ex and Ey components of a wave are not same, the polarisation will be a) Linear b) Elliptical c) Circular d) Parallel

Last Answer : b) Elliptical

The magnitude of the Ex and Ey components are same in which type of polarisation? a) Linear b) Circular c) Elliptical d) Perpendicular

Description : The magnitude of the Ex and Ey components are same in which type of polarisation? a) Linear b) Circular c) Elliptical d) Perpendicular

Last Answer : b) Circular

When the phase angle between the Ex and Ey component is 0 0 or 180 0 , the polarisation is a) Elliptical b) Circular c) Linear d) Perpendicular

Description : When the phase angle between the Ex and Ey component is 0 0 or 180 0 , the polarisation is a) Elliptical b) Circular c) Linear d) Perpendicular

Last Answer : c) Linear

For a critical angle of 60 degree and the refractive index of the first medium is 1.732, the refractive index of the second medium is a) 1 b) 1.5 c) 2 d) 1.66

Description : For a critical angle of 60 degree and the refractive index of the first medium is 1.732, the refractive index of the second medium is a) 1 b) 1.5 c) 2 d) 1.66

Last Answer : b) 1.5

The angle at which the wave must be transmitted in air media if the angle of reflection is 45 degree is a) 45 b) 30 c) 60 d) 90

Description : The angle at which the wave must be transmitted in air media if the angle of reflection is 45 degree is a) 45 b) 30 c) 60 d) 90

Last Answer : a) 45

The angle of incidence of a wave of a wave with angle of transmission 45 degree and the refractive indices of the two media given by 2 and 1.3 is a) 41.68 b) 61.86 c) 12.23 d) 27.89

Description : The angle of incidence of a wave of a wave with angle of transmission 45 degree and the refractive indices of the two media given by 2 and 1.3 is a) 41.68 b) 61.86 c) 12.23 d) 27.89

Last Answer : a) 41.68

The angle of incidence is equal to the angle of reflection for perfect reflection. State True/False. a) True b) False

Description : The angle of incidence is equal to the angle of reflection for perfect reflection. State True/False. a) True b) False

Last Answer : a) True

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