8-B-14: Pulse Forming Networks Modulation
8-14B1:
The pulse developed by the modulator may have an amplitude greater than the supply voltage. This is possible by:
Employing a resonant charging choke.
Using a voltage multiplier circuit.
Discharging a capacitor through an inductor.
Discharging two capacitors in series and combining their charges.
8-14B2:
Pulse transformers and pulse-forming networks are commonly used to shape the microwave energy burst RADAR transmitter. The switching devices most often used in such pulse-forming circuits are:
SCR’s and Thyratrons.
Power MOSFETS and Triacs.
Switching transistors.
Thyratrons and BJT’s.
8-14B3:
The purpose of the pulse-forming network is to:
Determine the width of the modulating pulses.
Determine the pulse repetition rate.
Act as a high pass filter.
Act as a log pass filter.
8-14B4:
The shape and duration of the high-voltage pulse delivered to the magnetron is established by:
An artificial delay line.
An RC network in the keyer stage.
The duration of the modulator input trigger.
The time required to saturate the pulse transformer.
8-14B5:
Pulse-forming networks are usually composed of the following:
Series inductors and shunt capacitors.
Series capacitors and shunt inductors.
Resonant circuit with an inductor and capacitor.
None of the above.
8-14B6:
An artificial transmission line is used for:
Determining the shape and duration of pulses.
The transmission of RADAR pulses.
Testing the RADAR unit, when actual targets are not available.
Testing the delay time for artificial targets.
|
Color key:
|
|
● = Unseen
|
|
● = Weak
|
|
● = Review
|
|
● = Learned
|
|
● = Incorrect answer
|
