G7A11
PRACTICAL CIRCUITS · - Power supplies; schematic symbols
G7A11G7A →
Which symbol in figure G7-1 represents an NPN junction transistor?
- ASymbol 1
- BSymbol 2
- CSymbol 7
- DSymbol 11
Why A bipolar junction transistor symbol shows a straight base bar with two leads angling off it, one of which (the emitter) carries an arrowhead. In an NPN device the emitter arrow points away from the base, out of the transistor; a PNP has that arrow pointing in toward the base. Symbol 2 in figure G7-1 is the one with the base bar and the outward-pointing emitter arrow.
Watch out Symbol 1 is the field effect transistor, whose gate lead meets a straight channel line rather than a short base bar, and Symbol 7 is a tapped inductor, a coil with a connection taken off the middle of the windings.
NPN = Not Pointing iN: the emitter arrow points out, away from the base.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
The rest of G7A
- G7A01 What is the function of a power supply bleeder resistor?
- G7A02 Which of the following components are used in a power supply filter network?
- G7A03 Which type of rectifier circuit uses two diodes and a center-tapped transformer?
- G7A04 What is characteristic of a half-wave rectifier in a power supply?
- G7A05 What portion of the AC cycle is converted to DC by a half-wave rectifier?
- G7A06 What portion of the AC cycle is converted to DC by a full-wave rectifier?
- G7A07 What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?
- G7A08 Which of the following is characteristic of a switchmode power supply as compared to a linear power supply?
- G7A09 Which symbol in figure G7-1 represents a field effect transistor?
- G7A10 Which symbol in figure G7-1 represents a Zener diode?
- G7A11 Which symbol in figure G7-1 represents an NPN junction transistor?
- G7A12 Which symbol in Figure G7-1 represents a solid core transformer?
- G7A13 Which symbol in Figure G7-1 represents a tapped inductor?