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RADIO NAV-RH-THEORY-CHAPTER7-BASIC RADAR PRINCIPLES
1.
With regards to radio waves, which statement is true?
a) They are reflected by metallic objects with a size compatible to the wavelength
b) The longer the wavelength the greater the surface attenuation
c) They travel at 186,000 nm a second in a vacuum
d) High frequencies need large aerials
2.
The main factor which affects the maximum range of a pulse radar is:
a) the pulse repetition frequency
b) the size of the radar screen
c) the frequency of the radar transmission
d) the aerial system size
3.
In relation to radar systems that use pulse technology, the term Pulse Recurrence Rate (PRR) signifies the:
a) ratio of pulse period to pulse width
b) delay after which the process re-starts
c) the number of cycles per second
d) number of pulses per second
4.
The advantages of CW radar systems over pulse radar systems are:
a) they are more reliable
b) the transmitter/receiver aerial system is smaller and less complex
c) there is no minimum range
d) they offer better long range performance
5.
The main advantage of a slotted scanner is:
a) reduces side lobes and directs more energy into the main beam
b) removes the need for azimuth slaving
c) side lobe suppression
d) can produce simultaneous map and weather information
6.
For any given circumstances, in order to double the effective range of a primary radar the power output must be increased by a factor of:
a) 2
b) 16
c) 4
d) 8
7.
The prime factor in determining the maximum unambiguous range of a primary radar is the:
a) pulse recurrence rate
b) power output
c) size of parabolic receiver aerial
d) height of the transmitter above the ground
8.
The interval in time between the commencement of two consecutive pulses is:
a) pulse rate
b) pulse width
c) pulse recurrence frequency
d) pulse recurrence period
9.
The main advantage of a continuous wave radar over a pulsed radar is:
a) more complex equipment but better resolution and accuracy
b) removes the minimum range restriction
c) smaller more compact equipment
d) permits measurement of Doppler in addition to improved range and bearing
10.
The maximum range of primary radar depends on:
a) a pulse recurrence frequency
b) wave length
c) frequency
d) pulse length
11.
A Primary radar operates on the principle of:
a) transponder interrogation
b) pulse technique
c) phase comparison
d) continuous wave transmission
12.
The speed of a radio wave in nm/sec is:
a) 300,000
b) 161,842
c) 163,842
d) 186,000
13.
A radio wave with a horizontal magnetic component would be best received by a ___ aerial.
a) magnetic
b) parabolic
c) horizontal
d) vertical
14.
Which one of the following statements is correct concerning the use in primary radar of continuous wave transmissions as compared with pulse transmissions?
a) A smaller common transmitter and receiver aerial can be used
b) It eliminates the minimum target reception range
c) It is less effective in short range radars but more effective in long range radars
d) The equipment required is more complex in continuous wave radar but this is offset by greater reliability and accuracy
15.
The main factor which determines the minimum range that can be measured by a pulsed radar is pulse:
a) repetition rate
b) amplitude
c) length
d) frequency
16.
The minimum range of a primary radar, using the pulse technique, is determined by the (i); the maximum unambiguous range by the (ii)
a) (i) transmission frequency (ii) pulse recurrence frequency
b) (i) transmission frequency (ii) transmitter power output
c) (i) pulse length (ii) length of the time-base
d) (i) pulse length (ii) pulse recurrence frequency
17.
The term Doppler shift refers to:
a) the change in depression angle measured at the receiver
b) the change in the speed measured at the receiver
c) the change in phase angle measured at the receiver
d) the change in frequency measured at the receiver
18.
Which combination of characteristics gives best screen picture in a primary search radar?
a) Short pulse length and narrow beam
b) Long pulse length and wide beam
c) Long pulse length and narrow beam
d) Short pulse length and wide beam
19.
In a primary radar using pulse technique, pulse length determines:
a) target discrimination
b) maximum measurable range
c) beam width
d) minimum measurable range
20.
In a primary radar using pulse technique, pulse recurrence frequency (PRF)/pulse recurrence rate (PRR) determines:
a) minimum range
b) beam width
c) maximum theoretical range
d) target discrimination
21.
The beam width from a parabolic reflector aerial is:
a) dependant on the transmitted pulse length
b) dependant on the transmitted pulse repetition frequency
c) dependant on the transmitted pulse repetition interval
d) dependant on the transmitted frequency
22.
In a Cathode Ray Tube the grid is used to:
a) control the focus
b) control the brilliance
c) drain electrons from the tube
d) deflect the electron stream to form a time-base
23.
In a cathode ray tube the grid potential is:
a) negative with respect to the cathode
b) the same as the cathode
c) zero
d) the same as the second anode
24.
In relation to primary radar, what does the term Pulse Recurrence Frequency signify?
a) The radar frequency used
b) The number of revolutions performed by the radar antenna per minute
c) The number of pulses transmitted per second
d) The time between each transmission of pulses
25.
What most determines a primary radars’ ability to accurately determine target range:
a) Aerial rpm
b) Beam width
c) Transmitter power
d) Pulse length
26.
What technique is employed by primary radar employing a single aerial dish:
a) Pulse technique
b) Continuous wave
c) Phase comparison
d) Pseudo random noise
27.
Short range aerodrome radars will have ___ wave lengths
a) millimetric
b) centimetric
c) decimetric
d) metric
28.
What does pulse recurrence rate refer to:
a) the number of cycles per second
b) the number of pulses per second
c) the ratio of pulse width to pulse repetition period
d) the delay known as fly-back or dead time
29.
Which is the most suitable radar for measuring short ranges:
a) millimetric pulse
b) continuous wave primary
c) centimetric pulse
d) continuous wave secondary
30.
The definition of a radar display will be best with:
a) Narrow beam width and narrow pulse width
b) Narrow beam width and wide pulse width
c) Wide beam width and narrow pulse width
d) Wide beam width and wide pulse width
31.
Attenuation of radio waves means:
a) the weakening of the radiated waves
b) the atmospheric bending of the waves
c) only the scattering of the waves by the tropopause
d) only the absorption of radio energy by the sea
32.
The factor which determines the minimum range of a radar is:
a) PRF
b) Pulse interval
c) Pulse length
d) Radio frequency of transmission
33.
A monochrome radar operating in the contour mode ___ and indicates them as hollow centres:
a) adjusts the gain to exclude returns above the iso-echo level
b) is incapable of painting returns above the iso-echo level because of the
limitations of the system
c) cancels returns above the iso-echo level
d) adjusts the gain to exclude returns below the iso-echo level
34.
On what principle does primary ATC radar work?
a) pulse technique
b) pulse comparison
c) continuous wave
d) transponder interrogation
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