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Electro-Mechanical Engineering > NOCTI Review 2 SemiConductors > Flashcards

NOCTI Review 2 SemiConductors Flashcards

1
Q

The Junction of a Diode is

A

The boundary between the P and N materials.

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2
Q

When a junction diode is made, some of the electrons move and fill some of the holes which form…

A

Depletion Region

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3
Q

When a junction diode is made, a barrier potential builds up and…

A

Prevents additional expansion of the depletion region

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4
Q

When calculating current flow for circuits, it is often not important to correct for the diode drop because…

A

The supply voltage is relatively high.

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5
Q

The leakage current in a reverse biased silicon diode can be expected to in increase as…

A

The temperature increases.

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6
Q

The volt-ampere characteristic curve of a resistor is

A

A straight line.

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7
Q

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…

A

Avalanche Breakover.

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8
Q

The forward voltage drop of a silicone diode can be expected to decrease as…

A

Temperature Increases.

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9
Q

A diode is checked with an ohmmeter and measure 40 ohms. The leads are reversed and the ohmmeter shows infinity ohms. The diode is…

A

Good.

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10
Q

Assume that the source develops 10 volts Peak to Peak. What wave form do you expect across resister two?

A

A clipped sine wave at 1.2 Volts peak-to-peak.

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11
Q

If the solid-state device is an IRED, will it emit light?

A

Yes, but it will not be visible.

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12
Q

Assuming a diode drop of 2 V, pick a resistor value that will limit the diode current 20 mA.

A

150 Ohms

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13
Q

A certain power supply has three terminals: +24V, -24V, and ground. The supply is?

A

Bi-Polar

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14
Q

Assuming that the capacitor has failed and is open. What is the expected DC voltage at the resistor?

A

54V

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15
Q

A DC power supply has an open bleeder resistor. Which of the following symptoms is most likely?

A

High Output Voltage

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16
Q

The response of human hearing for loudness is?

A

Logarithmic

17
Q

What is the ratio power gain of an amplifier that produces 150 watts of output for 1 watt of input?

A

150

18
Q

The output level of an amplifier is specified as +40 dBm. What is this level in Watts?

A

10 W

19
Q

Which amplifier class shows the best efficiency?

A

C

20
Q

Which amplifier class is useful only for RF applications?

A

C

21
Q

Which amplifier shows the largest conduction angle?

A

A

22
Q

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:

A

50 W

23
Q

What enables a class C power amplifier to produce a reasonable sine wave at its output?

A

A tank circuit

24
Q

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?

A

57.5db

25
Q

The input circuit of an operation amplifier is?

A

A differential amplifier

26
Q

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

A

-180 degrees

27
Q

A comparator with an open-collector output will often require a?

A

Pull-Up Resistor

28
Q

A window comparator’s output is active when Vin is?

A

Between the limits

29
Q

The basic material in monolithic ICs is?

A

Silicon

30
Q

Monolithic ICs are batch processed on large wager because?

A

Chip handing would be difficult and expensive

31
Q

When forming BJTs during IC manufacturing, the emitter diffusion follows the collector and base diffusions because:

A

The emitter region is the most heavily doped

32
Q

On the fabrication line, when defective ICs are discovered they are?

A

Discarded

33
Q

And A/D converter in a DSP system samples?

A

At a rate higher than the highest signal frequency

34
Q

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?

A

33%

35
Q

When silicon controlled rectifiers are used to control load intensity, they are operating in a mode that is similar to a?

A

Switch

36
Q

Commutation is achieved by?

A

The line zero crossings

37
Q

Which of the following is sometimes applied to eliminate noise generation in a control circuit?

A

Zero voltage switching

Electro-Mechanical Engineering (3 decks)

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