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Electromagnetic-theory Questions Set 66:

Quiz Mode

Calculate the Gain of the Antenna, where Efficiency is 100% and Directivity is 1.

1.5

0.5

Solution:

The starting resistance of a D.C. motor is generally

low

infinitely large

1000 Ω

around 500 Ω

Solution:

What is the refractive index of medium 2 when the critical angle is 55° and the refractive index of medium 1 is 1.333?

0.62

1.62

1.09

2.43

Solution:

Calculate the critical angle for the interface between two media with permittivities of 15 and 9 respectively.

37.78°

39.17°

36.86°

50.82°

Solution:

If the loss angle of a medium is π/4, what will be the value of the loss tangent and the type of material?

0, Dielectric

∞, Insulator

1, Semiconductor

1, Conductor

Solution:

For an end-fire array with around 1000 elements equally spaced at a distance of a quarter wavelength, what is the directivity of the antenna array system?

10 dB

20 dB

30 dB

40 dB

Solution:

The number of Faraday tubes of flux passing through a surface in an electric field is called the

electric charge density

electric field intensity

electric flux

magnetic flux density

Solution:

If a transmission line of length less than λ/4 is short-circuited, it behaves as

Pure capacitive reactance

Series resonant circuit

Parallel resonant circuit

Pure inductive reactance

Solution:

The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is:

2×10¹⁶

5×10⁶

1×10¹⁷

4×10¹⁵

Solution:

If the distance between the plates of a parallel plate capacitor is halved and the dielectric constant is doubled, then its capacitance will:

Increase by 4 times

Increase by 2 times

Remain the same

Increase by 16 times

Electromagnetic-theory Questions Set 66:

Calculate the Gain of the Antenna, where Efficiency is 100% and Directivity is 1.

Solution:

The starting resistance of a D.C. motor is generally

Solution:

What is the refractive index of medium 2 when the critical angle is 55° and the refractive index of medium 1 is 1.333?

Solution:

Calculate the critical angle for the interface between two media with permittivities of 15 and 9 respectively.

Solution:

If the loss angle of a medium is π/4, what will be the value of the loss tangent and the type of material?

Solution:

For an end-fire array with around 1000 elements equally spaced at a distance of a quarter wavelength, what is the directivity of the antenna array system?

Solution:

The number of Faraday tubes of flux passing through a surface in an electric field is called the

Solution:

If a transmission line of length less than λ/4 is short-circuited, it behaves as

Solution:

The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is:

Solution:

If the distance between the plates of a parallel plate capacitor is halved and the dielectric constant is doubled, then its capacitance will:

Solution:

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