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Radar principle is used in

detection of aircraft
burglar alarms
garage door openers
all of the above

Correct Answer: all of the above

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More Questions from Microwave Communication

Which one of the following is also called 'rat race'?
A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.
Assertion (A): A line of length slightly more than and open circuited at far end is equivalent to an inductive reactance. Reason (R): A line of length slightly more than and short circuited at far end behaves as a capacitive reactance.
In TE mode of waveguide Ez = 0
The speed at which axial electric field due to signal advances in a TWT is equal to
A line of length slightly less than and short circuited at far end behaves as
In directional coupler of the given figure, the terms |S14| and |S23| of scattering matrix are nearly
Depth of penetration does not depend on frequency.
Assertion (A): Slotted line is frequently used for microwave measurements. Reason (R): The unknown impedance is mounted at the end of slotted line.
Assertion (A): Inter-digitated geometry is widely used for microwave transistors. Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.

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