Home Chapter 4 Multiple Choice

# Multiple Choice

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

 hre. hFE. IC. VCE.

## 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. VCC.

## The value of DC

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

## The term BJT is short for

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

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

 375 mA 37.5 mA 3.75 mA 0.375 mA

## A certain transistor has IC = 15 mA and IB = 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 RC = 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 VBE is:Figure 4-1

 0.6 V 0.7 V 1.2 V 0.079 V

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

 9.9 V 9.2 V 0.7 V 19.3 V

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

 9.2 V 9.9 V –9.9 V –9.2 V

## Refer to Figure 4-2; if VCE = 0.2 V, IC(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 IB 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 VIN 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 VIN = 8 V. Determine IC(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 VIN = 8 V. The value of RB that will produce saturation is:

 92 k 9.1 M 100 k 150 k

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

 saturation. cutoff. normal. not enough data.

## Refer to Figure 4-3. You measure VCE 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?

 IE = IB + IC IB = IC+ IE IC = IB + IE none of the above

## What is the ratio of IC to IB?

 DC hFE DC either DC or hFE, but not DC

## What is the ratio of IC to IE?

 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 < VCE 0.7 < VCE < VCE(max) VCE(max) > VCE none of the above

## What does DC vary with?

 IC ºC both IC and ºC IC, 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