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Bipolar Junction Transistors (bjt) Online Exam Quiz

Important questions about Bipolar Junction Transistors (bjt). Bipolar Junction Transistors (bjt) MCQ questions with answers. Bipolar Junction Transistors (bjt) exam questions and answers for students and interviews.

1. Which is beta's current ratio?

Options

A : I C /I B

B : I C /I E

C : I B /I E

D : I E /I B

2. When transistors are used in digital circuits they usually operate in the:

Options

A : active region

B : breakdown region

C : saturation and cutoff regions

D : linear region

3. Total emitter current is:

Options

A : I E ? I C

B : I C + I E

C : I B + I C

D : I B ? I C

4. The input/output relationship of the common-collector and common-base amplifiers is:

Options

A : 270 degrees

B : 180 degrees

C : 90 degrees

D : 0 degrees

5. With the positive probe on an NPN base, an ohmmeter reading between the other transistor terminals should be:

Options

A : open

B : infinite

C : low resistance

D : high resistance

6. Three different Q points are shown on a dc load line. The upper Q point represents the:

Options

A : minimum current gain

B : intermediate current gain

C : maximum current gain

D : cutoff point

7. A current ratio of I C /I E is usually less than one and is called:

Options

A : beta

B : theta

C : alpha

D : omega

8. Most of the electrons in the base of an NPN transistor flow:

Options

A : out of the base lead

B : into the collector

C : into the emitter

D : into the base supply

10. The C-B configuration is used to provide which type of gain?

Options

A : voltage

B : current

C : resistance

D : power

1. A transistor may be used as a switching device or as a:

Options

A : fixed resistor

B : tuning device

C : rectifier

D : variable resistor

2. If a transistor operates at the middle of the dc load line, a decrease in the current gain will move the Q point:

Options

A : off the load line

B : nowhere

C : up

D : down

3. If V CC = +18 V, voltage-divider resistor R 1 is 4.7 k?, and R 2 is 1500?, what is the base bias voltage?

Options

A : 8.70 V

B : 4.35 V

C : 2.90 V

D : 0.7 V

4. What is the collector current for a C-E configuration with a beta of 100 and a base current of 30 µA?

Options

A : 30 µA

B : .3 µA

C : 3 mA

D : 3 MA

5. With low-power transistor packages, the base terminal is usually the:

Options

A : tab end

B : middle

C : right end

D : stud mount

6. The Q point on a load line may be used to determine:

Options

A : V C

B : V CC

C : V B

D : I C

7. For a C-C configuration to operate properly, the collector-base junction should be reverse biased, while forward bias should be applied to which junction?

Options

A : collector-emitter

B : base-emitter

C : collector-base

D : cathode-anode

8. A collector characteristic curve is a graph showing:

Options

A : emitter current (I E ) versus collector-emitter voltage (V CE ) with (V BB ) base bias voltage held constant

B : collector current (I C ) versus collector-emitter voltage (V CE ) with (V BB ) base bias voltage held constant

C : collector current (I C ) versus collector-emitter voltage (V C ) with (V BB ) base bias voltage held constant

D : collector current (I C ) versus collector-emitter voltage (V CC ) with (V BB ) base bias voltage held constant

9. Which is the higher gain provided by a C-E configuration?

Options

A : voltage

B : current

C : resistance

D : power

10. If an input signal ranges from 20?40 µA (microamps), with an output signal ranging from .5?1.5 mA (milliamps), what is the ac beta?

Options

A : 0.05

B : 20

C : 50

D : 500

1. With a PNP circuit, the most positive voltage is probably:

Options

A : ground

B : V C

C : V BE

D : V CC

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