Key Topic 33: Variable Range Markers

Question 1

8-33D1: The variable range marker signal is normally fed to the input of the:

A. Sweep amplifier.
B. Low voltage power supply regulator.
C. Video amplifier.
D. Range ring oscillator.

Answer 1

C. Video amplifier.

Question 2

8-33D2: The purpose of the variable range marker is to:

A. Provide an accurate means of determining the range of a moving target.
B. Provide a bearing line between own ship and a moving target.
C. Indicate the distance between two different targets.
D. Provide a means of calibrating the fixed range rings.

Answer 2

A. Provide an accurate means of determining the range of a moving target.

Question 3

8-33D3: How is the variable range marker usually adjusted for accuracy?

A. Adjusting the frequency of the VRM oscillator at the maximum range.
D. Adjusting the frequency of the VRM oscillator at the minimum range.
C. Adjusting the readout to match at the median range ring.
D. The minimum and maximum ranges are aligned with the matching fixed range ring.

Answer 3

D. The minimum and maximum ranges are aligned with the matching fixed range ring.

Question 4

8-33D4: The panel control for the variable range marker is normally a:

A. Variable resistor.
B. Variable inductance.
C. Variable capacitance.
D. Variable resolver.

Answer 4

A. Variable resistor.

Question 5

8-33D5: An important component of the VRM system is the:

A. Resolver.
B. Interference rejection circuit.
C. STC sensitivity control.
D. Shift register.

Answer 5

D. Shift register.

Question 6

8-33D6: Which of the following statements about the Variable Range Marker system is correct?

A. The VRM is an auxiliary output of the fixed range marker oscillator.
B. The VRM system develops a single adjustable range ring.
C. The VRM system is calibrated using a frequency counter.
D. The VRM system is controlled by a crystal oscillator.

Answer 6

B. The VRM system develops a single adjustable range ring.