CET Section I-1

If the op-amp in the circuit of Figure 1-1 is working properly, the signal voltage at point X should be:

• 0 V
• 0.7 V
• 9 V
• 18 V

If a unit under test appears to be dead, what is the first area that should be suspect?

• power supply
• output unit
• middle functional block
• none of the above

What symptom would be observed if the feedback resistor on a non-inverting op-amp circuit opens?

• no observable symptom
• reduced output
• output only at positive and negative saturation
• an overheated op-amp chip

Using the proper ohmmeter, resistance tests in both directions are performed across a silicon diode which has been removed from a circuit. Both tests indicate high resistance. What can be concluded?

• it is a good component
• the diode is shorted
• the diode is open
• no conclusions until a power test is performed

What output should be seen in the circuit of Figure 1-2?

• high
• low
• pulsing
• high impedance

What symptom would likely be observed when the emitter bypass capacitor opens on a common emitter amp?

• no symptom is observable
• reduced gain
• overheated transistor
• overheated emitter resistor

What Vcc power supply voltage should be observed in TTL circuits?

• 3 – 15 V
• 5 V
• 12 V
• + / - 15 V

What device is often used to protect systems from very fast, momentary, voltage spikes?

• zener
• SCR
• varistor
• varactor

What is the DC output of a Class A amplifier designed for maximum DC compliance, with no signal applied, and powered by 12 volts?

• .7 V
• 0 V
• 12 V
• 6 V

What indication is seen when resistance testing a good fuse?

• very low resistance
• infinite resistance
• low resistance in one direction and high resistance in the other direction
• approximately 1000 ohms in both directions