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Assignment Questions - 14190_197
Assignment Questions - 14190_199

Neets Module 18-Radar Principles
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18 3-10.   Which of the following circuits produces currents that deflect the electron beam across the crt? 1.    Gate 2.    Sweep control 3.    Sweep generator 4.    Intensity gate generator 3-11.   Electromagnetic deflection is preferred over electrostatic deflection in ppi scopes because it provides which of the following advantages? 1.    Better control of the beam 2.    Better beam position accuracy 3.    Better deflection sensitivity 4.    All of the above 3-12.   Focusing is accomplished in an electromagnetic crt by varying the 1.    potential on the deflection plates 2.    potential between the first anode and the cathode 3.    current through the coil around the neck of the tube 4.    do bias current in the deflection coils 3-13.   Because the electromagnetic crt uses magnetic deflection, the sweep circuits must provide the deflection coils with which of the following signals? 1.    Linear trace current 2.    Trapezoidal voltage 3.    Sinusoidal voltage 4.    Direct current 3-14.   In a ppi scope that uses electromagnetic deflection, the amplitudes and polarities of the sawtooth currents are determined by which of the following inputs? 1.    Target position and speed 2.    Antenna rotation speed 3.    Antenna position 4.    Both 2 and 3 above 3-15.   On the screen of a ppi scope, range markers appear as 1.    vertical pulses 2.    radial grid lines 3.    concentric circles 4.    horizontal grid lines 3-16.   The range sweep in a range-gate generator is started at the same time the transmitter fires.  A pulse from which of the following circuits causes this timing? 1.    Receiver 2.    Indicator 3.    Transmitter 4.    Synchronizer 3-17.   When used with a ppi presentation, a range gate must have which of the following characteristics? 1.    Movable in range 2.    Movable in bearing 3.    Both 1 and 2 above 4.    Fixed in range and bearing 3-18.   Range-markers are produced on the basis of which of the following timing constants? 1.    Radar mile 2.    Transmitter prf 3.    Receiver bandwidth 4.    Transmitter pulse width 3-19.   To read range directly, the range step is placed in what position relative to an echo pulse? 1.    The range step is centered on the echo pulse 2.    The range step coincides with the leading edge of the echo pulse 3.    The range step coincides with the trailing edge of the echo pulse 4.    The range step covers the entire echo pulse






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