Chapter 7 Self Test: BJT Biasing - Electronics Principles by Malvino/Bates

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Base voltage

For emitter bias, the voltage at the emitter is 0.7 V less than the

Ground

For the emitter bias, the voltage across the emitter resistor is the same as the voltage between the emitter and the

Equal the collector supply voltage

If a splash of solder shorts the collector resistor of TSEB, the collector voltage will

Equal the collector supply voltage

If the base resistor opens with TSEB, the collector voltage will

Increase

If the collector resistance decreases in a VDB circuit, the collector voltage will

Low

If the collector resistor is open, the collector voltage is

Base current

If the current gain is unknown in an emitter-biased circuit, you cannot calculate the

Decreases

If the emitter resistance decreases in a VDB circuit, the collector voltage

Decrease

If the emitter resistance decreases with TSEB, the collector voltage will

Q point moves up

If the emitter resistance decreases, the

Drop in half

If the emitter resistance doubles with TSEB, the collector current will

Increases

If the emitter resistance increases, the collector voltage

Double

If the emitter resistance is reduced by one-half in a VDB circuit, the collector current will

High

If the emitter resistor is open, the collector voltage is

Small

In TSEB, the base current must be very

RB , 0.01 bdc RE

In a TSEB circuit, the base voltage is approximately zero when

Equal to ßdc RE

In a VDB circuit, the base input resistance RIN is

Much smaller than the voltage divider current

In a well-designed VDB circuit, the base current is

Near 0 V

The base voltage of two-supply emitter bias (TSEB) is

Current gain

The collector voltage of a VDB circuit is not sensitive to changes in the

The ratio of collector current to base current

The current gain of a pnp transistor is

Opposite npn currents

The currents of a pnp transistor are

Emitter voltage

The first step in analyzing emitter-based circuits is to find the

Emitter bias

A circuit with a fixed emitter current is called

Switching circuits

Base bias is associated with

Emitter bias

VDB has a stable Q point like

Stable Q point

VDB is noted for its

Only one supply

VDB needs

Active region

VDB normally operates in the

Current gain

The Q point of TSEB does not depend on the

Almost totally insensitive to changes in current gain

The Q point of a VDB circuit is

Increased sensitivity

The major advantage of a phototransistor as compared to a photodiode is its

Holes

The majority carriers in the emitter of a pnp transistor are

Remains almost the same

When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current

Emitter current

Which is the largest current in a pnp transistor?

Decrease the collector voltage

With VDB, an increase in collector resistance will

0.7 V higher than the base voltage

With a TSEB pnp circuit using a negative VCC supply, the emitter voltage is

Resistors

With pnp voltage-divider bias, you must use

Less than the base supply voltage

With voltage-divider bias, the base voltage is


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