ETA Study Guide Exam and Actual
Answers.
If the gate voltage level that turns on an active SCR drops below the trigger point, while anode
and cathode voltages are maintained, what will occur? - Answer Stays on
The input of the op-amp in the figure below is a 5mV sine wave (centered about +1.5 V). What
will the output be? - Answer A 10 mV sine wave cenered about -3V
Historically, the first number in a semiconductor identification code, such as 1N345A, indicates
the________. - Answer Number of Junctions
When calculating voltage ratios, which of the following formulas should be used? - Answer
dB = 20log(V2/V1)
The most common method of coupling RF amplifiers is _____ coupling. - Answer
Transformer
If a power supply produces 20 volts with no load and 15 volts under full load, what is the
percent of regulation? - Answer {(20-15)/15 = 0.333333333... = 33.3%
In the figure below which of the silicon diodes will conduct, given the voltages applied? -
Answer 0.9 -> 0.2
The maximum reverse-bias voltage that may be applied to a diode without causing junction
breakdown is the _______. - Answer Peak reverse voltage
Tunnel diodes can be used as ________. - Answer Oscillators
The basic components of a series voltage regulator are: - Answer Zener Diode, transistor,
resistor
With the souce input connected to channel one of an oscilloscope, you should use the input
coupling switch in the AC position when __________. --?-- - Answer A stabilized output is
desired
A 'dummy load' is a/an: - Answer Resistive component that is attached to the end of
transmission line to absorb all incident energy
, Pierce oscillators use quartz crystals. these crystals will exhibit the _______ effect. - Answer
Piezoelectric
A differentiator circuit consists of resistors and capacitors esigned to change an AC input to a DC
output. True or false? - Answer False
What are the two main factors that affect the frequency response of an amplifier's circuit? -
Answer Capacitance and inductance
Which of the following is the proper equation to calculate the alpha gain of a transistor? -
Answer (B+1)/B =A
What is the effect on a varactor diode (varicap) when the reverse bias voltage is increased? -
Answer Capacitance Decreaes
The most common method of coupling between two stages of an analog circuit is __ coupling. -
Answer RC
The ideal frequency response of an audio amplifier is equal gain from _________. - Answer
15Hz to 20KHz
Which of the following are the three most commonly used bipolar junction transistor amplifier
configurations? - Answer Common emitter, common collector and common base
What are the four basic sections that make up a power supply? - Answer Transformer,
rectifier, filter and regulator
When calculating decibels and power, a 3dB gain indicates a _____________. - Answer
Doubling of power
What three major types of oscillators are commonly used in electronic circuitry? - Answer
Colpitts, hartley and pierce
The linearity of the rise voltage in a sawtooth wave is determined by the time ____, compared
to the time constant if driven by a voltage source. - Answer It takes for the capacitor to fully
charge
The unijunction transistor has ___ PN junction(s). - Answer 1
Answers.
If the gate voltage level that turns on an active SCR drops below the trigger point, while anode
and cathode voltages are maintained, what will occur? - Answer Stays on
The input of the op-amp in the figure below is a 5mV sine wave (centered about +1.5 V). What
will the output be? - Answer A 10 mV sine wave cenered about -3V
Historically, the first number in a semiconductor identification code, such as 1N345A, indicates
the________. - Answer Number of Junctions
When calculating voltage ratios, which of the following formulas should be used? - Answer
dB = 20log(V2/V1)
The most common method of coupling RF amplifiers is _____ coupling. - Answer
Transformer
If a power supply produces 20 volts with no load and 15 volts under full load, what is the
percent of regulation? - Answer {(20-15)/15 = 0.333333333... = 33.3%
In the figure below which of the silicon diodes will conduct, given the voltages applied? -
Answer 0.9 -> 0.2
The maximum reverse-bias voltage that may be applied to a diode without causing junction
breakdown is the _______. - Answer Peak reverse voltage
Tunnel diodes can be used as ________. - Answer Oscillators
The basic components of a series voltage regulator are: - Answer Zener Diode, transistor,
resistor
With the souce input connected to channel one of an oscilloscope, you should use the input
coupling switch in the AC position when __________. --?-- - Answer A stabilized output is
desired
A 'dummy load' is a/an: - Answer Resistive component that is attached to the end of
transmission line to absorb all incident energy
, Pierce oscillators use quartz crystals. these crystals will exhibit the _______ effect. - Answer
Piezoelectric
A differentiator circuit consists of resistors and capacitors esigned to change an AC input to a DC
output. True or false? - Answer False
What are the two main factors that affect the frequency response of an amplifier's circuit? -
Answer Capacitance and inductance
Which of the following is the proper equation to calculate the alpha gain of a transistor? -
Answer (B+1)/B =A
What is the effect on a varactor diode (varicap) when the reverse bias voltage is increased? -
Answer Capacitance Decreaes
The most common method of coupling between two stages of an analog circuit is __ coupling. -
Answer RC
The ideal frequency response of an audio amplifier is equal gain from _________. - Answer
15Hz to 20KHz
Which of the following are the three most commonly used bipolar junction transistor amplifier
configurations? - Answer Common emitter, common collector and common base
What are the four basic sections that make up a power supply? - Answer Transformer,
rectifier, filter and regulator
When calculating decibels and power, a 3dB gain indicates a _____________. - Answer
Doubling of power
What three major types of oscillators are commonly used in electronic circuitry? - Answer
Colpitts, hartley and pierce
The linearity of the rise voltage in a sawtooth wave is determined by the time ____, compared
to the time constant if driven by a voltage source. - Answer It takes for the capacitor to fully
charge
The unijunction transistor has ___ PN junction(s). - Answer 1
