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what does the word electronics mean
D. applications involving the control of electricity
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an electron is considered a free electron when it reaches the
A. conduction band
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a positive mobile charge is considered
D. hole
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excessive external heat appied to electronics components
D. causes increased current flow
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which condition exist when you connect the negative battery lead to a cathode
D. forward bias
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which device should only be used in DC ciruits
A. electrolytic capacitors
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which of the following is another term for a diode
C. PN junction
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which multimeter lead connection is used to read forward bias on a diode
C. black to cathode
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what does the arrow in the semiconductor indicate
A. direction of hole current
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what does a flat side or shorter lead on some LEDs indicate
A. cathode
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what is a zener diode typically used for
D. voltage regulation
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how are the electrode leads identified and labeled on a bipolar junction transistor
B. emitter, cathode, gate
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which letter combinations are types of bipolar junction transitors
B. NPN, PNP
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how many layers of semiconducting material does a silicon controlled rectifier (SCR) have?
B. four
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how does the base of a transistor normally recieve its control voltage
A. Voltage divider circuit
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how is the emitter base junction on a transitor connected
B. forward Biased
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transistors can be connected in how many configurations
A. three
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what controls the conduction time of a silicon controlled rectifier (SCR)
C. gate current
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how do you turn off a silicon controlled rectifier (SCR) in a minimum amunt of time?
B. apply reverse bias to the anode
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what is developed for logic gate circuits to determine signal output
C. truth tables
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which of the following is not a logic gate
A. STOP
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the two purposes of the load resistor of a half wave rectifier is to develop the output signal and to
A. limit current flow to a safe level
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if the input freq. to a half wave rectifier is 120Hz, its output ripple is
C. 120PPS
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a fullwave rectifier can be identified easily on a schematic bec it contains
C. a center tapped transformer
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the breakdown rating for diodes is a full wave rectifier must be twice as great as the
A. half wave rectifier diode
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what freq. is the output ripple of a bridge rectifier with an input freq. of 60Hz
A. 120 PPS
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the output ripple freq. of a three phase bridge rectifier is how many times the input freq.
C. six times
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the output of a three phase bridge rectifier is of low ampitude and requires
C. very little filtering
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why does a ripple voltage exist in a circuit powered by a rectifier
C. The rectifier supplies energy to the load in pulses
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an inductive (choke) input filter gives a lower output voltage than the capacitive input LC filter and also
C. better voltge regulation
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which of there characteristics are one of the pi-type LC filter
C. High output voltage and better voltage regulation
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in the common emitter configuration, the input is between the emitter and the base and the output is between the
D. collector and emitter
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what does the positive alternation of an input signal to the base of an NPN transistor in a common emitter configuration cause
D. an increase in base current
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the controlling element in a common base configuration is the
D. emitter
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which gain characteristics of a common base transistor amplifier is less than one
C. Current
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the process of returning a part of the output of an amplifier back to its input in such a manner that it cancels part of the input signal is known as
A. degeneration
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input resistance to a common collector amplifier is high bec the emitter signal opposes the
C. base signal
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what purpose does the zener diode in the electronic voltage regulator serve?
B. sets reference voltage
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the output voltage of the electronic voltage regulator circuit
D. can be adjusted to a specific value
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what frequencies, in hertz (Hz) are the most common for transmission of electrical power
D. 50, 60, 400
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which instrument gives immediate qualitative infomation on the degree and type of distortion
D. oscilloscope
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