ISCET Radar Flashcards WITH CORRECT
QUESTIONS AND ANSWERS 2025/2026.
A basic sample-and-hold circuits contains: - correct answers An analog-switch, a capacitor,
amplifiers, and input and output buffers.
A circuit card in a radar system has just been replaced with a spare card. You notice the voltage
level at point C in EL8-C is negative 4.75V when the inputs are all at 5V. The problem is: - correct
answers The 50K resistor has been mistakenly replaced with a 25K resistor
A circuit used to develop AFC voltage in a radar receiver is called the: - correct answers
Discriminator
A CW Radar is being frequency modulated with a low-frequency sine wave to provide range
measurements. To develop a range indication, the receiver would most likely use a: - correct
answers Phase comparator, tuned to the modulating frequency
A CW radar may be used to determine the rate of travel of a target and whether it is moving
toward or away from the radar position. To make this determination: - correct answers The
principals of Doppler Effect are employed
A defective crystal in the AFC section will cause: - correct answers Bright flashing pie sections on
the PPI
A directional coupler has an attenuation of -30db. A measurement of 100 milliwatts at the
coupler indicates the power of the line is: - correct answers 100 watts
,A ferrite circular is most commonly used in what portion of a radar system? - correct answers
The duplexor
A high magnetron current indicates: - correct answers A defective external magnetic field
A keep-alive voltage is applied to: - correct answers The TR Tube
A logarithmic IF amplifier is preferable to a linear IF amplifier in a radar receiver because: -
correct answers It has greater dynamic range
A magnetron has a cathode-anode potential of 20kilovolts. Electrons emitted by the cathode: -
correct answers Sustain oscillation by their cycloidal paths
A major consideration for the use of a switching regulator power supply over a linear regulator
is: - correct answers The overall efficiency of a switching regulator is much higher than that of a
linear power supply
A microwave transmission line constructed of a center conductor suspended between parallel
conductive ground planes is called: - correct answers Stripline
A negative voltage is commonly applied to the magnetron cathode rather than a positive
voltage to the magnetron anode because: - correct answers The anode can be operated at
ground potential for safety reasons
A pulse-width modulator in a switching power supply is used to: - correct answers Vary the duty
cycle of the regulator switch to the control the output voltage
, A radio wave will travel a distance of three nautical miles in: - correct answers 18.51
microseconds
A raster-scan radar display maintains the display presentation on the CRT face by the use of: -
correct answers Video RAM
A shipboard radar uses a PFN driving a magnetron cathode through a step-up transformer. This
results in which type of modulation. - correct answers Pulse modulation
A thick layer of rust and corrosion on the surface of the parabolic dish will have what effect? -
correct answers Decrease in performance, especially for weak targets
A typical shipboard radar antenna is a: - correct answers slotted waveguide array
A wavelength is equal to how many degrees of a sine wave? - correct answers 360
Accurate range markers must be developed using very narrow pulses. A circuit that could be
used to provide these high-quality pulses for the CRT is a: - correct answers Blocking oscillator
Airport wind radars depend on: - correct answers The Doppler effect to track rapid shifts in wind
patterns
An advantage of resonant charging is that it: - correct answers Reduces the high-voltage power
supply requirements
An AFC system keeps the receiver tubed to the transmitted signal by varying the frequency of: -
correct answers The local oscillator
An artificial line is used for: - correct answers Determining the shape and durations of the pulses
QUESTIONS AND ANSWERS 2025/2026.
A basic sample-and-hold circuits contains: - correct answers An analog-switch, a capacitor,
amplifiers, and input and output buffers.
A circuit card in a radar system has just been replaced with a spare card. You notice the voltage
level at point C in EL8-C is negative 4.75V when the inputs are all at 5V. The problem is: - correct
answers The 50K resistor has been mistakenly replaced with a 25K resistor
A circuit used to develop AFC voltage in a radar receiver is called the: - correct answers
Discriminator
A CW Radar is being frequency modulated with a low-frequency sine wave to provide range
measurements. To develop a range indication, the receiver would most likely use a: - correct
answers Phase comparator, tuned to the modulating frequency
A CW radar may be used to determine the rate of travel of a target and whether it is moving
toward or away from the radar position. To make this determination: - correct answers The
principals of Doppler Effect are employed
A defective crystal in the AFC section will cause: - correct answers Bright flashing pie sections on
the PPI
A directional coupler has an attenuation of -30db. A measurement of 100 milliwatts at the
coupler indicates the power of the line is: - correct answers 100 watts
,A ferrite circular is most commonly used in what portion of a radar system? - correct answers
The duplexor
A high magnetron current indicates: - correct answers A defective external magnetic field
A keep-alive voltage is applied to: - correct answers The TR Tube
A logarithmic IF amplifier is preferable to a linear IF amplifier in a radar receiver because: -
correct answers It has greater dynamic range
A magnetron has a cathode-anode potential of 20kilovolts. Electrons emitted by the cathode: -
correct answers Sustain oscillation by their cycloidal paths
A major consideration for the use of a switching regulator power supply over a linear regulator
is: - correct answers The overall efficiency of a switching regulator is much higher than that of a
linear power supply
A microwave transmission line constructed of a center conductor suspended between parallel
conductive ground planes is called: - correct answers Stripline
A negative voltage is commonly applied to the magnetron cathode rather than a positive
voltage to the magnetron anode because: - correct answers The anode can be operated at
ground potential for safety reasons
A pulse-width modulator in a switching power supply is used to: - correct answers Vary the duty
cycle of the regulator switch to the control the output voltage
, A radio wave will travel a distance of three nautical miles in: - correct answers 18.51
microseconds
A raster-scan radar display maintains the display presentation on the CRT face by the use of: -
correct answers Video RAM
A shipboard radar uses a PFN driving a magnetron cathode through a step-up transformer. This
results in which type of modulation. - correct answers Pulse modulation
A thick layer of rust and corrosion on the surface of the parabolic dish will have what effect? -
correct answers Decrease in performance, especially for weak targets
A typical shipboard radar antenna is a: - correct answers slotted waveguide array
A wavelength is equal to how many degrees of a sine wave? - correct answers 360
Accurate range markers must be developed using very narrow pulses. A circuit that could be
used to provide these high-quality pulses for the CRT is a: - correct answers Blocking oscillator
Airport wind radars depend on: - correct answers The Doppler effect to track rapid shifts in wind
patterns
An advantage of resonant charging is that it: - correct answers Reduces the high-voltage power
supply requirements
An AFC system keeps the receiver tubed to the transmitted signal by varying the frequency of: -
correct answers The local oscillator
An artificial line is used for: - correct answers Determining the shape and durations of the pulses
