Antennas

Up to which frequency the ground wave propagation is used?

• 2 MHz

• 2 GHz

• 30 MHz

• 30 GHz

In a ground wave propagation, which component of electric field is short circuited when it’s in contact by earth?

• 
  Both horizontal and vertical
  

• Neither horizontal nor vertical

• Horizontal

• Vertical

Sky wave propagation reflects the frequencies ___________

• 2MHz

• 2 MHz to 30MHz

• 2 GHz to 30 GHz

• 30 GHz to 50GHz

At what distance the sky wave propagation is present from the earth surface?

• 50 to 400km

• Below 50 km

• 600 to 750km

• 50 to 400 m

Space wave propagation reflects the waves with frequencies _________

• Below 2 GHz

• 2 to 30MHz

• Above 30GHz

• Above 30MHz

Space wave propagates at which frequency band?

• VHF

• HF

• MF

• EHF

A radio can tune to any station in the frequency range from 2.5 MHz to 15 MHz bands. What is the corresponding wavelength band?

• 30 m to 130 m

• 40 m to 140 m

• 20 m to 120 m

• 10 m to 110 m

Answer explanation

What is the unit for relative permittivity?

• F/m

• Fm

• F/m²

• No unit

absolute permittivity ε₀ is equal to

• 4π ×10⁻⁷ F/m

• 3 ×10⁸ F/m

• 1.16 ×10⁻¹⁹ F/m

• 8.85 x 10⁻¹² F/m

Absolute permeability μ₀ is equal to

• 4π × 10⁻⁷

• 3 × 10⁸

• 1.16 × 10⁻19

• 8.85 ×10⁻¹²