Quiz-1 Introduction to RADAR_UNIT-IV

RADAR:

• detects only stationary objects

• detects only moving targets

• detects only incoming targets

• detects only stationary and moving targets

RADAR X-band is :

• 8 GHz – 12 GHz

• 4 GHz – 8 GHz

• 2 GHz – 4 GHz

• 1 GHz – 2 GHz

Indicate which one of the following applications or advantages of RADAR beacons is false:

• Target identification

• Navigation

• Very significant extension of the maximum range

• More accurate tracking of enemy targets

Which statement(s) regarding the working of a RADAR system is/are wrong?

• maximum range is proportional to the square-root of the capture area of the receiving antenna

• maximum range is inversely proportional to the diameter if wavelength is kept constant

• maximum radar range is independent of the effective target area

• Both B and C

Three dimensional RADARs determine :

• altitude, range and bearing

• range, bearing and elevation

• elevation, altitude and range

• elevation, azimuth and range

In a RADAR transmitter, the function of modulator is to

• allow the use of same antenna for transmission and reception

• switch the tube OFF and ON as required

• control pulse repetition frequency (PRF)

• increase maximum range of the radar

RADAR range primarily depends upon

• peak transmitted power

• average transmitted power

• independent of transmitted power

• distance between ends

When a power P_t is transmitted by an antenna, amount of energy incident on the target is given by the expression:

• P_t×G/4πR²

• P_t/4πR²

• P_t×4 πR²/G

• None of the mentioned

If the peak transmitted power in a radar system is increased by a factor of 16, the maximum range will be increased by a factor

• 2

• 4

• 8

• 16

The term RADAR cross section defines the:

• Scattering ability of the target

• Power radiating ability of the radar

• Amount of energy scattered by unwanted objects

• Cross section of radar area through which energy is emitted