SFM 2023_MODULE 1_DAY 1: 1ST MAR 2023

What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication?

• 1 m – 10 m

• 1 cm – 10 cm

• 10 cm – 1 m

• 0.1 cm – 1 cm

Which among the following is an application of high frequency?

• SONAR

• Subsurface communication

• Radio navigation

• Facsimile

Power density is basically termed as ________ power per unit area

• Reflected

•  Refracted

• Radiated

• Diffracted

When an electromagnetic wave travels from transmitter to receiver, which factor/s affect/s the propagation level?

• Curvature of earth

• Roughness of earth

• Magnetic field of earth

• All of the above

What is the nature of radiation pattern of an isotropic antenna?

• Spherical

• Dough-nut

• Elliptical

• Hyperbolic

 In which kind of array configuration, the element locations must deviate or adjust to some non-planar surface like an aircraft or missile?

• Linear

•  Planar

• Conformal

• All of the above

For large distances the earth can be considered as

•  Flat region

• Curved region

• Flat, curved region

•  None

 Antennas convert __________to___________

• Photons to electrons

• Electrons to photons

• Electrons to electrons

• Both a and b

• Both a and c

The photons that make up radio waves travel at the same speed as the photons that make  up visible light.

• True

• False

The electromagnetic spectrum can be expressed in terms of energy, wavelength, or  frequency.

• True

• False