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In cell phone antennas are

In cell phone antennas are

The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is

The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is

Purpose of antenna is

Purpose of antenna is

Antenna is a __________ element

Antenna is a __________ element

Which of the following antennas is λ /4 length?

Which of the following antennas is λ /4 length?

Which of the following is λ/2 length?

Which of the following is λ/2 length?

In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is

In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is

In a rectangular waveguide ZTE . ZTM is

In a rectangular waveguide ZTE . ZTM is

A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The reflection coefficient will be

A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The reflection coefficient will be

A λ/8 section of transmission line is determined of load impedance of (2 – j 5) Ω. If characteristic impedance of line is 10 Ω. Then input impedance of line is

A λ/8 section of transmission line is determined of load impedance of (2 – j 5) Ω. If characteristic impedance of line is 10 Ω. Then input impedance of line is

Whenever a wave is incident on a perfect conductor then the reflection coefficient is

Whenever a wave is incident on a perfect conductor then the reflection coefficient is

A conductor carries 10 A current in + x direction and is lying in a field having a flux density 0.2 T directed along + z direction. The magnitude of force per metre length and direction are

A conductor carries 10 A current in + x direction and is lying in a field having a flux density 0.2 T directed along + z direction. The magnitude of force per metre length and direction are

Equipotential surfaces about a point charge are in which one of the following forms?

Equipotential surfaces about a point charge are in which one of the following forms?

Which one of the following statement is correct?

Which one of the following statement is correct?

A waveguide operated below cut off frequency can be used as

A waveguide operated below cut off frequency can be used as

Unit of e is __________ .

Unit of e is __________ .

ZL = 200 Ω and it is desired that Zi = 50 Ω The quarter wave transformer should have a characteristic impedance of

ZL = 200 Ω and it is desired that Zi = 50 Ω The quarter wave transformer should have a characteristic impedance of

For TE or TM modes of propagation in bounded media, the phase velocity is

For TE or TM modes of propagation in bounded media, the phase velocity is

An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves

An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves

When a particular mode is excited in a waveguide, these appears an extra electric components in the direction of propagation. The resulting mode is

When a particular mode is excited in a waveguide, these appears an extra electric components in the direction of propagation. The resulting mode is

Ferromagnetic materials

Ferromagnetic materials

The L/C has the dimension of

The L/C has the dimension of

An electric charge Q is placed in a dielectric medium which of the following quantities are independent of the dielectric constant ε of the medium

An electric charge Q is placed in a dielectric medium which of the following quantities are independent of the dielectric constant ε of the medium

The thin parallel wires are carrying current along the same direction. The force experienced by one due to the other is

The thin parallel wires are carrying current along the same direction. The force experienced by one due to the other is

Laplacian of a scalar function v is

Laplacian of a scalar function v is

A (75 – j 40) W load is connected to a co-axial line of z0 = 75ω at 6 MHz. The load matching on the line can be accomplished by connecting

A (75 – j 40) W load is connected to a co-axial line of z0 = 75ω at 6 MHz. The load matching on the line can be accomplished by connecting

Polystyrene has a relative permittivity of 2.7. If the wave is incident at an angle θi of 30° from air into polystyrene, the angle of transmission will be nearly

Polystyrene has a relative permittivity of 2.7. If the wave is incident at an angle θi of 30° from air into polystyrene, the angle of transmission will be nearly

The cut off wavelength λc for TE20 mode for a standard rectangles waveguide is

The cut off wavelength λc for TE20 mode for a standard rectangles waveguide is

The dimension of flux density is

The dimension of flux density is

A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of

A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of

For a hollow waveguide, the axial current must necessarily be

For a hollow waveguide, the axial current must necessarily be

Consider the following; for a loss-less transmission line we can write, Zin = – jz0 for a shorted line with l = λ/8Zin = ± j ∞ for a shorted line with l = λ/4Zin= jz0 for an open line with l = λ/2Zin = 0 for a matched line of any length Select the correct answer using the codes given below codes.

Consider the following; for a loss-less transmission line we can write, Zin = – jz0 for a shorted line with l = λ/8Zin = ± j ∞ for a shorted line with l = λ/4Zin= jz0 for an open line with l = λ/2Zin = 0 for a matched line of any length Select the […]

The current distribution along a travelling wave antenna can be written in the form

The current distribution along a travelling wave antenna can be written in the form

For a wave propagating in air filled rectangular waveguide.

For a wave propagating in air filled rectangular waveguide.

It is desired to reduce the reflection at an air porcelain by use of 7/4 plate (for Porcelain μ = 40, and εr = 7). The thickness of the polystyrene plate required at 10 GHz will be

It is desired to reduce the reflection at an air porcelain by use of 7/4 plate (for Porcelain μ = 40, and εr = 7). The thickness of the polystyrene plate required at 10 GHz will be

When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called

When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called

A plane EM wave is travelling in an unbound loss less dielectric having μy = 1 and εy = 4, the time average Poynting vector of the wave is 5 W/m3 . The phase velocity vp (assuming velocity of light as 3 x 108 m/sec) is

A plane EM wave is travelling in an unbound loss less dielectric having μy = 1 and εy = 4, the time average Poynting vector of the wave is 5 W/m3 . The phase velocity vp (assuming velocity of light as 3 x 108 m/sec) is

When a plane wave is incident normally from dielectric ‘1’ (μ0, ε1) onto dielectric ‘2’ (μ0, ε2) the electric field of the transmitted wave is 2 times the electric field of the reflected wave. The ratio ε2/ε1 is

When a plane wave is incident normally from dielectric ‘1’ (μ0, ε1) onto dielectric ‘2’ (μ0, ε2) the electric field of the transmitted wave is 2 times the electric field of the reflected wave. The ratio ε2/ε1 is

For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be

For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be

A rectangular waveguide (2.29 x 1.02) cm operates at a freq. of 11 GHz in TE10 mode. If the maximum potential gradient of the signal is 5 kV/cm, then the maximum power handling capacity of the waveguide will be

A rectangular waveguide (2.29 x 1.02) cm operates at a freq. of 11 GHz in TE10 mode. If the maximum potential gradient of the signal is 5 kV/cm, then the maximum power handling capacity of the waveguide will be