NOCTI Review 2 SemiConductors Flashcards
The Junction of a Diode is
The boundary between the P and N materials.
When a junction diode is made, some of the electrons move and fill some of the holes which form…
Depletion Region
When a junction diode is made, a barrier potential builds up and…
Prevents additional expansion of the depletion region
When calculating current flow for circuits, it is often not important to correct for the diode drop because…
The supply voltage is relatively high.
The leakage current in a reverse biased silicon diode can be expected to in increase as…
The temperature increases.
The volt-ampere characteristic curve of a resistor is
A straight line.
The curve for a certain silicon diode shows a rapid increase in reverse current at a reverse bias of 1000 V this point on the curve his called…
Avalanche Breakover.
The forward voltage drop of a silicone diode can be expected to decrease as…
Temperature Increases.
A diode is checked with an ohmmeter and measure 40 ohms. The leads are reversed and the ohmmeter shows infinity ohms. The diode is…
Good.
Assume that the source develops 10 volts Peak to Peak. What wave form do you expect across resister two?
A clipped sine wave at 1.2 Volts peak-to-peak.
If the solid-state device is an IRED, will it emit light?
Yes, but it will not be visible.
Assuming a diode drop of 2 V, pick a resistor value that will limit the diode current 20 mA.
150 Ohms
A certain power supply has three terminals: +24V, -24V, and ground. The supply is?
Bi-Polar
Assuming that the capacitor has failed and is open. What is the expected DC voltage at the resistor?
54V
A DC power supply has an open bleeder resistor. Which of the following symptoms is most likely?
High Output Voltage
The response of human hearing for loudness is?
Logarithmic
What is the ratio power gain of an amplifier that produces 150 watts of output for 1 watt of input?
150
The output level of an amplifier is specified as +40 dBm. What is this level in Watts?
10 W
Which amplifier class shows the best efficiency?
C
Which amplifier class is useful only for RF applications?
C
Which amplifier shows the largest conduction angle?
A
The theoretical efficiency of a 25 W, transformer-coupled, class A amplifier is 50%. Since the input signal can be reduced to zero, the output transistor in such an amplifier must be capable of safely dissipating as much as:
50 W
What enables a class C power amplifier to produce a reasonable sine wave at its output?
A tank circuit
A differential amplifier provides a differential voltage gain of 75 and a common mode voltage gain of 0.1. What is the decibel CMRR for this amplifier?
57.5db
The input circuit of an operation amplifier is?
A differential amplifier
Frequency compensation in an op amp makes sure that the gain of the amplifier has dropped to less than 1 at that frequency where the internal lags due to transistor capacitance sim to
-180 degrees
A comparator with an open-collector output will often require a?
Pull-Up Resistor
A window comparator’s output is active when Vin is?
Between the limits
The basic material in monolithic ICs is?
Silicon
Monolithic ICs are batch processed on large wager because?
Chip handing would be difficult and expensive
When forming BJTs during IC manufacturing, the emitter diffusion follows the collector and base diffusions because:
The emitter region is the most heavily doped
On the fabrication line, when defective ICs are discovered they are?
Discarded
And A/D converter in a DSP system samples?
At a rate higher than the highest signal frequency
A 20 ohm load is connected to a 120 V source through a control rheostat that is set to 40 ohms. What is the circuit efficiency?
33%
When silicon controlled rectifiers are used to control load intensity, they are operating in a mode that is similar to a?
Switch
Commutation is achieved by?
The line zero crossings
Which of the following is sometimes applied to eliminate noise generation in a control circuit?
Zero voltage switching
