3d1x5 CDC Pool Of 100
For use by 3D1X5 personnel for the purpose of CDC EOC testing.
- 1.What characteristic of frequency does a radar target moving towards the radar exhibit?
- A.
A lower frequency than the original broadcast
- B.
A higher frequency than the original broadcast
- C.
No apparent frequency change than the original broadcast
- D.
Oscillating lower and higher frequency changes in respect to the original broadcast
- 2.What radar subassembly allows the radar system to transmit and receive from the same antenna?
- A.
Synchronizer
- B.
Transmitter
- C.
Modulator
- D.
Duplexer
- 3.An antenna is said to be reciprocal if
- A.
It is nonlinear
- B.
It transmits patterns
- C.
It contains ferrite devices
- D.
Its transmit and receive patterns are identical
- 4.Which feedhorn is used only for receiving?
- A.
Active
- B.
Linear
- C.
Passive
- D.
Circular
- 5.The shape of the beam of radar energy and its antenna pattern depend on the radar’s
- A.
Gain
- B.
Location
- C.
Purpose
- D.
Power
- 6.The scanning method used by the radar system refers to the
- A.
Direction of energy into an appropriately shaped beam
- B.
Orientation of the electromagnetic wave as it travels through space
- C.
Motion of the antenna axis (of the beam) as the radar looks for an aircraft
- D.
Efficient launch and reception of electromagnetic energy in the atmosphere or space
- 7.What scan is identified at the electronic countermeasure receiver by its regular intervals between illuminations?
- A.
Raster
- B.
Conical
- C.
Circular
- D.
Monopulse
- 8.Which scan radar is also used in the acquisition phase by some airborne intercept radars?
- A.
Raster
- B.
Conical
- C.
Circular
- D.
Monopulse
- 9.What causes delayed, but separate, pulses?
- A.
Simultaneous reception of pulse-type information
- B.
Near-simultaneous reception of pulse-type information
- C.
Electromagnetic (EM) waves reach the receiving antenna by direct paths
- D.
EM waves reach the receiving antenna by indirect paths
- 10.Attempts to reduce multipath effects on radar tracking accuracy include the use of
- A.
Off-axis tracking
- B.
Frequency agility
- C.
Monopulse radar
- D.
Off-boresight tracking
- 11.What type of radar system uses a B-scan indicator?
- A.
Long-range surveillance
- B.
Airport surveillance
- C.
Precision approach
- D.
Weather
- 12.What target information is provided by a plan-position indicator?
- A.
Azimuth only
- B.
Elevation only
- C.
Range and azimuth
- D.
Elevation and range
- 13.In a Raster scan indicator, how many vertical scan periods does it take to produce one complete picture?
- A.
1
- B.
2
- C.
3
- D.
4
- 14.The vacuum in a cathode-ray tube (CRT)
- A.
Prevents implosion if the CRT is broken
- B.
Keeps the phosphor coating from burning
- C.
Eliminates static charges on the deflection plates
- D.
Prevents collisions between electrons in the beam and air molecules
- 15.An X pulse is present in a selective identification feature code train when
- A.
A Mode 4 reply is being received
- B.
The aircraft is a pilotless drone or missile
- C.
The aircraft is declaring a military emergency
- D.
It is requested by the radar operator to identify the aircraft position
- 16.Which selective identification feature special response explains a 7500 reply?
- A.
Communication failure
- B.
Military emergency
- C.
Engine failure
- D.
Hijacking
- 17.What is the AN/UPM–155 radar test set capable of testing?
- A.
Interrogators and associated components
- B.
Radar antenna orientation
- C.
Radar jamming strength
- D.
Radar receivers
- 18.What factor determines the spacing of the sidebands in an amplitude modulated signal?
- A.
Amplitude of the modulating signal
- B.
Frequency of the modulating signal
- C.
Amplitude of the carrier signal
- D.
Frequency of the carrier signal
- 19.In frequency modulation, the amount of oscillator frequency change is
- A.
Inversely proportional to the amplitude of the modulating signal
- B.
Directly proportional to the amplitude of the modulating signal
- C.
Inversely proportional to the phase of the modulating signal
- D.
Directly proportional to the phase of the modulating signal
- 20.In phase modulation, the carrier’s
- A.
Phase shifts at the rate of the modulating signal
- B.
Phase shifts with the phase of the modulating signal
- C.
Amplitude shifts at the rate of the modulating signal
- D.
Amplitude shifts with the phase of the modulating signal
- 21.What size bit combinations are allowed when using 16–phase shift keying?
- A.
2 bit
- B.
3 bit
- C.
4 bit
- D.
5 bit
- 22.How is the parity bit used in asynchronous transmission?
- A.
By the receiving device to verify that the transmission was received correctly
- B.
By the transmitting device to verify that the transmission was transmitted correctly
- C.
By the modulator device to verify that the intelligence signal was received correctly
- D.
By the band limiting device to verify that the output signal was transmitted correctly
- 23.How does synchronous transmission reduce the overhead costs of data transmission?
- A.
Communicates in parallel format
- B.
Blocks many characters together for transmission
- C.
Eliminates the control bits, so more message data can be sent
- D.
Uses low cost equipment to support synchronous transmission
- 24.When using forward error control as a method of error correction, where does error correction take place?
- A.
Receiving end
- B.
In the oscillator
- C.
Transmitting end
- D.
In the primary buffers
- 25.Which statement describes an advantage of using fiber optic cable?
- A.
The easy tap-ability of fiber optic cables reduces security risks
- B.
Fiber optic cable has a higher attenuation than coaxial cable
- C.
Electromagnetic fields do not affect fiber optic cables
- D.
Nuclear radiation does not affect fiber optic cable
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