Midterm

Jack Jones1

week_4_mid_term_2.docx

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Week 4 mid term

Question 1

Copper is a good conductor.

True

False

3 points

Question 2

Doping is a process of adding impurity atoms to an intrinsic crystal to alter its electrical conductivity.

True

False

3 points

Question 3

You can quickly check the condition of a diode with an ohmmeter on a high resistance range.

True

False

3 points

Question 4

The letter Q is an abbreviation for quiescent, which represents the AC signal is operating between cut-off and saturation points of the transistor.

True

False

3 points

Question 5

The half-wave rectifier has a diode in parallel with a load resistor.

True

False

3 points

Question 6

In an NPN transistor, the emitter and collector are both n-type materials.

True

False

3 points

Question 7

The dc beta is also known as the current gain because a small base current controls a much larger collector current.

True

False

3 points

Question 8

The load line is a visual summary of all the possible transistor operating points.

True

False

3 points

Question 9

With the switch in the position as shown in Figure 1 below, the LED is on.

Figure 1

True

False

3 points

Question 10

A transistor can be tested using an ohmmeter to check back and front resistances of emitter-base, collector-base, and collector-emitter.

True

False

3 points

Question 11

Hard saturation refers to any design that makes the saturation current gain approximately:

		1
		10
		100
		1000

4 points

Question 12

While testing a transistor with an ohmmeter, a high reverse/forward resistance ratio for the emitter-base and base-collector junctions indicates

		this transistor is good.
		this transistor is open and should be replaced.
		this transistor is shorted and should be replaced.
		this transistor is a small-signal amplifier.

4 points

Question 13

A major advantage of an optocoupler is the:

		electrical isolation between input and output circuits.
		electrical connection between input and output circuits.
		higher gain.
		low cost of manufacturing the device.

4 points

Question 14

With normal circuit operation, Vout in Figure 2 is ________.

Figure 2

		Approximately 0V
		115 Vac
		20 V
		10 V DC

4 points

Question 15

If the 115 V ac is removed from the circuit shown in Figure 2, what would be measured at Vout?

Figure 2

		approximately 0 V
		115 V
		20 V
		10 V

4 points

Question 16

What type transistor connection is shown in Figure 3 below?

Figure 3

		common emitter
		common collector
		common base
		emitter follower

4 points

Question 17

What is the device that increases a transistor's power rating by reducing the internal heat faster?

		heater wire
		chassis
		grommet
		heat sink

4 points

Question 18

Another name for diode offset voltage is:

		barrier potential
		ripple voltage
		surge voltage
		filtered voltage

4 points

Question 19

The second approximation of a silicon diode is basically the:

		the diode appears as a switch in series with a barrier potential of 0.7 V
		the diode appears as a switch in parallel with a barrier potential of 0.7 V
		the diode appears as a barrier potential of 0.4 V
		the diode appears as a short circuit