Multiple Choice

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From the choices below these questions or statements choose the correct answer to the question, identify the statement as true or false, choose the words that correctly fill in the blanks, or choose the phrase that correctly completes the statement.

This activity contains 31 questions.

The dc load line on a family of collector characteristic curves of a transistor shows the

	saturation region.
	cutoff region.
	active region.
	all of the above

A transistor data sheet usually identifies _DC as

	h_re.
	h_FE.
	I_C.
	V_CE.

When a transistor is used as a switch, it is stable in which two distinct regions?

	saturation and active
	active and cutoff
	saturation and cutoff
	none of the above

For a silicon transistor, when a base-emitter junction is forward-biased, it has a nominal voltage drop of

	0.7 V.
	0.3 V.
	0.2 V.
	V_CC.

The value of _DC

	is fixed for any particular transistor.
	varies with temperature.
	varies with I_C.
	varies with temperature and I_C.

The term BJT is short for

	base junction transistor.
	binary junction transistor.
	both junction transistor.
	bipolar junction transistor.

A BJT has an I_B of 50 A and a _DC of 75; I_C is:

	375 mA
	37.5 mA
	3.75 mA
	0.375 mA

A certain transistor has I_C = 15 mA and I_B = 167 A; _DC is:

	15
	167
	0.011
	90

For normal operation of a pnp BJT, the base must be _ with respect to the emitter and _ with respect to the collector.

	positive, negative
	positive, positive
	negative, positive
	negative, negative

A transistor amplifier has a voltage gain of 100. If the input voltage is 75 mV, the output voltage is:

	1.33 V
	7.5 V
	13.3 V
	15 V

A 35 mV signal is applied to the base of a properly biased transistor with an r'_e = 8

and R_C = 1 k

. The output signal voltage at the collector is:

	3.5 V
	28.57 V
	4.375 V
	4.375 mV

Refer to Figure 4-1; the value of V_BE is:

Figure 4-1

	0.6 V
	0.7 V
	1.2 V
	0.079 V

Refer to Figure 4-1; the value of V_CE is:

	9.9 V
	9.2 V
	0.7 V
	19.3 V

Refer to Figure 4-1; the value of V_BC is:

	9.2 V
	9.9 V
	–9.9 V
	–9.2 V

Refer to Figure 4-2; if V_CE = 0.2 V, I_C(sat) is:

Figure 4-2

	0.05 mA
	2.085 mA
	1.065 mA
	7.4 mA

Refer to Figure 4-2. Determine the minimum value of I_B that will produce saturation.

	0.25 mA
	5.325 A
	1.065 A
	10.425 A

Refer to Figure 4-2. Determine the minimum value of V_IN from the following that will saturate this transistor.

	13.21 V
	12.51 V
	0.7 V
	9.4 V

Refer to Figure 4-3. The value of _DC = 100 and V_IN = 8 V. Determine I_C(sat).

Figure 4-3

	18 mA
	7.92 mA
	1.8 mA
	8 A

Refer to Figure 4-3. In this circuit _DC = 100 and V_IN = 8 V. The value of R_B that will produce saturation is:

	92 k
	9.1 M
	100 k
	150 k

Refer to Figure 4-3. The measured voltage, V_CE, is 20 V. The transistor is in

	saturation.
	cutoff.
	normal.
	not enough data.

Refer to Figure 4-3. You measure V_CE and find it nearly equal to zero. You now know that the transistor is

	operating in cutoff.
	operating normally.
	operating in saturation.
	operating below cutoff.

What is the order of doping, from heavily to lightly doped, for each region?

	base, collector, emitter
	emitter, collector, base
	emitter, base, collector
	collector, emitter, base

What are the two types of bipolar junction transistors?

	npn and pnp
	pnn and nnp
	ppn and nnp
	pts and stp

Which of the following is true for an npn or pnp transistor?

	I_E = I_B + I_C
	I_B= I_C+ I_E
	I_C = I_B + I_E
	none of the above

What is the ratio of I_C to I_B?

	_DC
	h_FE
	_DC
	either _DC or h_FE, but not _DC

What is the ratio of I_C to I_E?

	_DC
	_DC / (_DC + 1)
	_DC
	either _DC / (_DC + 1) or _DC, but not _DC

In what range of voltages is the transistor in the linear region of its operation?

	0 < V_CE
	0.7 < V_CE < V_CE(max)
	V_CE(max)> V_CE
	none of the above

What does _DC vary with?

	I_C
	ºC
	both I_C and ºC
	I_C, but not ºC

What is (are) common fault(s) in a BJT-based circuit?

	opens or shorts internal to the transistor
	open bias resistor(s)
	external opens and shorts on the circuit board
	all of the above

What is (are) general-purpose/small-signal transistors case type(s)?

	TO-18
	TO-92
	TO-39
	TO-52
	all of the above

The magnitude of dark current in a phototransistor usually falls in what range?

	mA
	μA
	nA
	pA

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Multiple Choice

The dc load line on a family of collector characteristic curves of a transistor shows the

A transistor data sheet usually identifies DC as

When a transistor is used as a switch, it is stable in which two distinct regions?

For a silicon transistor, when a base-emitter junction is forward-biased, it has a nominal voltage drop of

The value of DC

The term BJT is short for

A BJT has an IB of 50 A and a DC of 75; IC is:

A certain transistor has IC = 15 mA and IB = 167 A; DC is:

For normal operation of a pnp BJT, the base must be _____ with respect to the emitter and _____ with respect to the collector.

A transistor amplifier has a voltage gain of 100. If the input voltage is 75 mV, the output voltage is:

Refer to Figure 4-1; the value of VBE is:Figure 4-1

Refer to Figure 4-1; the value of VCE is:

Refer to Figure 4-1; the value of VBC is:

Refer to Figure 4-2; if VCE = 0.2 V, IC(sat) is:Figure 4-2

Refer to Figure 4-2. Determine the minimum value of IB that will produce saturation.

Refer to Figure 4-2. Determine the minimum value of VIN from the following that will saturate this transistor.

Refer to Figure 4-3. The value of DC = 100 and VIN = 8 V. Determine IC(sat).Figure 4-3

Refer to Figure 4-3. In this circuit DC = 100 and VIN = 8 V. The value of RB that will produce saturation is:

Refer to Figure 4-3. The measured voltage, VCE, is 20 V. The transistor is in

Refer to Figure 4-3. You measure VCE and find it nearly equal to zero. You now know that the transistor is