Key Topic 32: Schematics

Question 1

3-32D1: Given the combined DC input voltages, what would the output voltage be in the circuit shown in Figure 3D7?

A. 150 mV
B. 5.5 V
C. -15 mV
D. -5.5 V

Answer 1

D. -5.5 V

Question 2

3-32D2: Which lamps would be lit in the circuit shown in Figure 3D8?

A. 2, 3, 4, 5, and 6.
B. 5, 6, 8, and 9.
C. 2, 3, 4, 7, and 8.
D. 1, 3, 5, 7, and 8.

Answer 2

C. 2, 3, 4, 7, and 8.

Question 3

3-32D3: What will occur if an amplifier input signal coupling capacitor fails open?

A. No amplification will occur, with DC within the circuit measuring normal.
B. Improper biasing will occur within the amplifier stage.
C. Oscillation and thermal runaway may occur.
D. An AC hum will appear on the circuit output.

Answer 3

A. No amplification will occur, with DC within the circuit measuring normal.

Question 4

3-32D4: In Figure 3D9, determine if there is a problem with this regulated power supply and identify the problem.

A. R1 value is too low which would cause excessive base current and instantly destroy TR1.
B. D1 and D2 are reversed. The power supply simply would not function.
C. TR1 is shown as an NPN and must be changed to a PNP.
D. There is no problem with the circuit.

Answer 4

D. There is no problem with the circuit.

Question 5

3-32D5: In Figure 3D10 with a square wave input what would be the output?

A. 1
B. 2
C. 3
D. 4

Answer 5

C. 3

Question 6

3-32D6: With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would you expect to see on an oscilloscope display?

A. 1
B. 2
C. 3
D. 4

Answer 6

B. 2