- In a semi-conductor diode, electrons flow from:
A. anode to cathode.
B. cathode to grid.
C. grid to anode.
D. cathode to anode.
- If alternating current is applied to the anode of a diode, what
would you expect to see at the cathode?
A. No signal.
B. Steady direct current
C. Pulsating direct current.
D. Pulsating alternating current.
- In order for a diode to conduct, it must be:
A. close coupled.
B. forward-biased.
C. enhanced.
D. reverse-biased.
- The action of changing alternating current to direct current is
called:
A. amplification.
B. rectification.
C. transformation.
D. modulation.
- The electrodes of a semi-conductor diode are known as:
A. gate and source.
B. anode and cathode.
C. collector and base.
D. cathode and drain.
- One important application for diodes is recovering information from
transmitted signals. This is referred to as:
A. regeneration.
B. ionization.
C. biasing.
D. demodulation.
- What semi-conductor device glows red, yellow, or green, depending upon its chemical
composition?
A. A light-emitting diode.
B. A fluorescent bulb.
C. A neon bulb.
D. A vacuum diode.
- The primary purpose of a Zener diode is to:
A. provide a voltage phase shift.
B. regulate or maintain a constant voltage.
C. to boost the power supply voltage.
D. provide a path through which current can flow.
- Voltage regulation is the principal application of the:
A. junction diode.
B. light-emitting diode.
C. vacuum tube.
D. Zener diode.
- Zener diodes are used as:
A. current regulators.
B. voltage regulators.
C. RF detectors.
D. AF detectors.
- The basic semi-conductor amplifying device is:
A. tube.
B. P-N junction.
C. transistor.
D. diode.
- The three leads from a PNP transistor are named:
A. drain, base and source.
B. collector, emitter and base.
C. collector, source and drain.
D. gate, source and drain.
- Which component can amplify a small signal using low voltages?
A. A variable resistor.
B. An electrolytic capacitor.
C. A multiple-cell battery.
D. A PNP transistor.
- Bipolar transistors usually have:
A. 2 leads.
B. 3 leads.
C. 1 lead.
D. 4 leads.
- A semi-conductor is described as a "general purpose audio NPN device". This would
be:
A. a bipolar transistor.
B. a silicon diode.
C. a triode.
D. an audio detector.
- Two basic types of bipolar transistors are:
A. diode and triode types.
B. NPN and PNP types.
C. varicap and zener types.
D. P and N channel types.
- If a low level signal is placed at the input of a transistor, a higher level signal is
produced at the output lead. This effect is known as:
A. detection.
B. modulation.
C. rectification.
D. amplification.
- A transistor can be destroyed in a circuit by:
A. excessive heat.
B. excessive light.
C. saturation.
D. cut-off.
- In a bipolar transistor, the ________ compares closest to the control grid of a triode
vacuum tube:
A. emitter.
B. base.
C. source.
D. collector.
- In a bipolar transistor, the _________ compares closest to the plate in a triode
vacuum tube:
A. gate.
B. emitter.
C. collector.
D. base.
- In a bipolar transistor, the _________ compares closest to the cathode of a triode
vacuum tube:
A. collector.
B. base.
C. drain.
D. emitter.
- A semi-conductor having is leads labeled gate, drain and source is best described as a:
A. gated transistor.
B. field-effect transistor.
C. bipolar transistor.
D. silicon diode.
- The two basic types of field effect transistors (FET) are:
A. NPN and PNP.
B. germanium and silicon.
C. inductive and capacitive.
D. N and P channel.
- In a field effect transistor, the __________ is the terminal that controls the
conductance of the channel.
A. gate.
B. drain.
C. source.
D. collector.
- In a field effect transistor, the ___________ is the terminal where the charge carriers
enter the channel.
A. source.
B. gate.
C. drain.
D. emitter.
- In a field effect transistor, the __________ is the terminal where
the charge carriers leave the channel.
A. collector.
B. source.
C. drain.
D. gate.
- Which semi-conductor device has characteristics most similar to a triode vacuum
tube?
A. Junction diode.
B. Zener diode.
C. Field effect transistor.
D. Bipolar transistor.
- The control element of a field effect transistor is the:
A. gate.
B. source.
C. drain.
D. base.
- If you wish to reduce the current flowing in a field effect transistor, you could:
A. increase the reverse bias voltage.
B. decrease the reverse bias voltage.
C. increase the forward bias voltage.
D. increase the forward bias gain.
- The source of a field effect transistor corresponds to the _________ of a bipolar
transistor.
A. base.
B. emitter.
C. drain.
D. collector.
- The drain of a field effect transistor corresponds to the _________ of a bipolar
transistor.
A. base.
B. collector.
C. source.
D. emitter.
- Which two elements of a field effect transistor exhibit fairly similar characteristics?
A. Source and gate.
B. Gate and drain.
C. Source and base.
D. Source and drain.
- What is one reason a vacuum tube might be used instead of a transistor in a circuit?
A. It uses less current.
B. It may be able to handle higher power.
C. It is much smaller.
D. It uses lower voltages.
- Which component can amplify a small signal but must use high voltages?
A. A vacuum tube.
B. A transistor.
C. An electrolytic capacitor.
D. A multiple-cell battery.
- A feature common to tubes and transistors is that both:
A. have electrons drifting through a vacuum.
B. can amplify signals.
C. convert electrical energy to radio waves.
D. use heat to cause electron movement.
- In a vacuum tube, the element that is operated with the highest positive potential is
the _________.
A. filament (heater).
B. plate.
C. cathode.
D. grid.
- In a vacuum tube, the electrode that is usually a cylinder of wire mesh is the
________.
A. filament (heater).
B. grid
C. cathode.
D. plate.
- In a vacuum tube, the electrode that is furthest away from the plate is the _________.
A. grid.
B. emitter.
C. cathode.
D. filament (heater).
- In a vacuum tube, the electrode that emits electrons is the ________.
A. cathode.
B. grid.
C. collector.
D. plate.
- What is inside the envelope of a triode vacuum tube?
A. argon.
B. A vacuum.
C. Air.
D. Neon.
- How many grids are there in a triode vacuum tube?
A. two.
B. three.
C. three plus a filament.
D. one.
- If you do not want to have current flowing in the grid circuit of a vacuum tube, the
grid should be:
A. positive with respect to the anode.
B. negative with respect to the cathode.
C. positive with respect to both cathode and anode.
D. positive with respect to the cathode.
- The negative DC control voltage applied to the control grid of a vacuum tube is
called:
A. suppression voltage.
B. bias voltage.
C. repulsion voltage.
D. excitation voltage.
- A circuit designed to increase the level of the input signal is called:
A. an amplifier
B. a modulator
C. an oscillator
D. a receiver
- If an amplifier became non-linear, the output signal would:
A. become distorted
B. be saturated
C. cause oscillations
D. overload the power supply
- Which of the following is NOT amplified by an amplifier?
A. current
B. resistance
C. power
D. voltage
- The increase in signal level by an amplifier is called:
A. attenuation
B. amplitude
C. modulation
D. gain
- A device with gain has the property of:
A. attenuation
B. oscillation
C. modulation
D. amplification
- A device labeled "Gain = 10dB" is likely to be an:
A. attenuator
B. oscillator
C. audio fader
D. amplifier
- Amplifiers can amplify:
A. current, power, or inductance
B. voltage, current, or power
C. voltage, power, or inductance
D. voltage, current, or inductance
- Which of the following is not a property of an amplifier?
A. gain
B. linearity
C. distortion
D. loss