Key Topic 9: Circuits-1

Question 1

8-9A1: Blocking oscillators operate on the formula of:

A. T = R x C.
B. I = E/R
C. By using the receiver’s AGC.
D. None of the above are correct.

Answer 1

A. T = R x C.

Question 2

8-9A2: The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.

A. The ALU is used for address decoding.
B. The Memory and I/O communicate with peripherals.
C. The control unit executes arithmetic manipulations.
D. The internal bus is used simultaneously by all units.

Answer 2

B. The Memory and I/O communicate with peripherals.

Question 3

8-9A3: The phantastron circuit is capable of:

A. Stabilizing the magnetron.
B. Preventing saturation of the RADAR receiver.
C. Being used to control repeller voltage in the AFC system.
D. Developing a linear ramp voltage when triggered by an external source.

Answer 3

D. Developing a linear ramp voltage when triggered by an external source.

Question 4

8-9A4: The block diagram of a typical RADAR system microprocessor is shown in Fig. 8A2. Choose the most correct statement regarding this system.

A. The ALU executes arithmetic manipulations.
B. The ALU is used for address decoding.
C. General registers are used for arithmetic manipulations.
D. Address pointers are contained in the control unit.

Answer 4

A. The ALU executes arithmetic manipulations.

Question 5

8-8A5: In the Line-Driver/Coax/Line-receiver circuit shown in Fig. 8A3, what component is represented by the blank box marked “X”?

A. 25-ohm resistor.
B. 51-ohm resistor.
C. 10-microhm inductor.
D. 20-microhm inductor.

Answer 5

B. 51-ohm resistor.

Question 6

8-8A6: Choose the most correct statement:

A. The magnetron anode is a low voltage circuit.
B. The anode of the magnetron carries high voltage.
C. The filament of the magnetron carries dangerous voltages.
D. The magnetron filament is a low voltage circuit.

Answer 6

C. The filament of the magnetron carries dangerous voltages.