Basic Electrical Theory
In the figure shown, 2 represents the
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collector of a pnp transistor
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emitter of an npn transistor
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Correct Answerbase of an npn transistor
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source of a junction FET
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In the figure shown, 3 represents the
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drain of a junction FET
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Correct Answercollector of an npn transistor
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emitter of a pnp transistor
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base of an npn transistor
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In the figure shown, 2 represents the
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Correct Answerbase of a pnp transistor
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drain of a junction FET
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gate of a junction FET
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emitter of a pnp transistor
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In the figure shown, 1 represents the
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collector of a pnp transistor
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gate of a junction FET
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source of a MOSFET
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Correct Answeremitter of a pnp transistor
Correct answer: emitter of a pnp transistor
The symbol shown is a bipolar junction transistor (BJT). The arrow identifies the emitter, and the direction of the arrow indicates the transistor type:
- an arrow pointing toward the base means a pnp transistor
- an arrow pointing away from the base means an npn transistor
In the diagram, terminal 1 is the lead with the arrow pointing inward toward the base, so it is the emitter of a pnp transistor.
- collector of a pnp transistor is incorrect because the collector does not have an arrow.
- gate of a junction FET is incorrect because this symbol is a BJT, not a FET.
- source of a MOSFET is also incorrect because MOSFET symbols use a different gate and channel structure.
Therefore, terminal 1 represents the emitter of a pnp transistor.
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In the figure shown, 2 represents the
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drain of a p-channel junction FET
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collector of an npn transistor
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Correct Answergate of an n-channel junction FET
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base of a pnp transistor
Correct answer: gate of an n-channel junction FET
The symbol shown is for a junction field-effect transistor (JFET). In this symbol:
- The vertical line represents the channel between the drain and source.
- The terminal with the arrow pointing toward the channel is the gate.
For an n-channel JFET, the arrow on the gate points toward the channel, indicating the direction of conventional current in the p–n junction.
- A drain terminal does not have an arrow in this manner.
- Bipolar transistors use base, collector, and emitter terminals with a different symbol.
- A pnp transistor symbol is distinctly different from a JFET.
Therefore, terminal 2 represents the gate of an n-channel junction FET.
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In the figure shown, 3 represents the
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source of an n-channel junction FET
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gate of a p-channel junction FET
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emitter of a pnp transistor
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Correct Answerdrain of an n-channel junction FET
Correct answer: drain of an n-channel junction FET
The symbol shown is a junction FET (JFET). The arrow on the gate points toward the channel, which identifies it as an n-channel JFET.
In standard JFET symbols:
- the left terminal is the gate
- the top terminal is the drain
- the bottom terminal is the source
Since label 3 is connected to the top terminal, it represents the drain of an n-channel JFET.
- source of an n-channel junction FET is incorrect because the source is the lower terminal in this symbol.
- gate of a p-channel junction FET is incorrect because the arrow direction indicates an n-channel device, and the gate is the left terminal.
- emitter of a pnp transistor is incorrect because this symbol is a FET, not a bipolar transistor.
Therefore, terminal 3 is the drain of an n-channel junction FET.
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In the figure shown, 2 represents the
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Correct Answergate of a MOSFET
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base of a dual bipolar transistor
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anode of a silicon controlled rectifier
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cathode of a dual diode
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The figure shown represents a
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dual bipolar transistor
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dual diode
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dual varactor diode
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Correct Answerdual gate MOSFET
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In the figure shown, 3 represents the
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filament of a tetrode
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anode of a triode
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Correct Answergrid of a tetrode
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screen grid of a pentode
Correct answer: grid of a tetrode
The symbol shown is for a tetrode valve, which has:
- a filament (heater)
- a control grid
- a screen grid
- an anode (plate)
In the diagram, terminal 3 connects to one of the grid structures positioned between the filament and the anode.
- The filament is the heater element at the bottom of the valve.
- The anode is the plate located at the top.
- A pentode would show an additional grid.
Therefore, terminal 3 represents the grid of a tetrode.
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In the figure shown, 5 represents the
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grid of a tetrode
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Correct Answerscreen grid of a tetrode
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heater of a pentode
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grid of a triode
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