Electronics Final T/F

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A BJT has three elements: emitter, gate, and collector

False

A reverse breakdown usually occurs when a diode is forward biased by about .7v

False

An ohmmeter can be used to accurately test impedance of an RL circuit

False

Capacitance is the ability to store voltage

False

Current flows both ways simultaneously in an AC circuit

False

Electrolytic capacitors are ideal for alternating current applications

False

If a 1/4 w resistor and a 1/2 w resistor are wired in series, they can safely dissipate 3/4 w.

False

If a dc voltage is input to a transformer's primary, then an ac voltage is induced in its secondary

False

If one branch of a parallel circuit opens, the total resistance decreases

False

If the Voltage applied to a circuit doubles, then power dissipation doubles

False

If three equal resistors are connected in parallel across 12, each resistor drops 4 v.

False

Most diodes are made from a semiconductor material called germanium

False

The general characteristics of a common-emitter amplifier are low voltage gain, low current gain, and very high power gain

False

The total inductance of two parallel inductors equals the sum of their inductance values

False

When the input pulse width to an RC integrator is much less than 5t, the output approaches the shape of the input

False

A capacitor blocks dc and passes ac

True

A forward-biased silicon diode normally drops about .7 v

True

A high pass filter will cause some phase shifting of the signal

True

A magnetic field around a conductor is a good indication that current is flowing

True

A series RLC circuit can be configured for band-pass or band-stop filtering purposes

True

A step-down transformer could have been primary-secondary turns ratio of 4:1

True

A zener diode is used as a constant voltage regulator

True

As the frequency applied to an RC circuit increase, the impedance decreases

True

At resonance Xc equals Xl

True

If one branch of a parallel circuit shorts, the total resistance decreases

True

Most diodes are made from a semiconductor material called silicon

True

Photodiodes will conduct more as the light intensity upon them increases

True

The ideal amplifier has infinite gain, infinite input impedance and zero output impedance.

True

The terminals on a three-terminal regulator are input voltage, output voltage, and ground

True

The two types of BJTs are NPN and PNP

True

The voltage leads the current in an inductive circuit

True


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