Transistor Characteristics and Circuit Calculations Quiz

Which of these diagrams correctly labels the connections on a transistor?

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A transistor will conduct a collector current of 45 mA when a base current of 0.5 mA flows from the base to the emitter. What is the value of the current gain (β)?

• 90

• 180

• 2.5

• 111

For this circuit, what collector current will flow if the transistor is saturated and has a maximum collector current rating of 100 mA?

• 0 A, the transistor is saturated and cannot allow any current to flow

• 16.6 A will flow briefly, before damaging the transistor

• 0.06 A will flow continuously, as it is within the maximum current allowed

• 100 mA will flow as this is the current when saturated

A silicon transistor is to be used as a switch. It needs a base current of 1.5 mA for it to achieve saturation quickly enough. To achieve this from a 6 V supply, what is the value of the base resistance (R_B)?

• 3600 Ω

• 400 Ω

• 250 Ω

• 3200 Ω

What is the power dissipated in a transistor that has a collector-emitter voltage of 9 V and a collector current of 30 mA?

• 120 mW

• 200 mW

• 270 mW

• 360 mW