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CET study guide questions and answers 100% pass, Exams of Electronics

Which of the following wires has the greatest cross sectional area? ✔✔9 AWG The capacitance of a capacitor ____if the distance between the plates decreases while all other properties of the capacitor remain the same. ✔✔increases A voltmeter that converts AC to DC by rectifying the voltage, would be used to indicate the correct value of measured ______. ✔✔varying DC voltages only in the drawing below, what is the current through the resistor? 10V 5Ω ✔✔2 amps which of the below waveforms show approx. one complete cycle? ✔✔A and D What is the peak voltage of the waveform below? (up 7V) ✔✔7v which of the below would be the best test freq. for general audio troubleshooting? ✔✔1 KHz

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CET study guide questions and answers
100% pass
Which of the following wires has the greatest cross sectional area? ✔✔9 AWG
The capacitance of a capacitor ____if the distance between the plates decreases while all other
properties of the capacitor remain the same. ✔✔increases
A voltmeter that converts AC to DC by rectifying the voltage, would be used to indicate the
correct value of measured ______. ✔✔varying DC voltages only
in the drawing below, what is the current through the resistor? 10V 5Ω ✔✔2 amps
which of the below waveforms show approx. one complete cycle? ✔✔A and D
What is the peak voltage of the waveform below? (up 7V) ✔✔7v
which of the below would be the best test freq. for general audio troubleshooting? ✔✔1 KHz
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe

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CET study guide questions and answers

100% pass

Which of the following wires has the greatest cross sectional area? ✔✔9 AWG

The capacitance of a capacitor ____if the distance between the plates decreases while all other properties of the capacitor remain the same. ✔✔increases

A voltmeter that converts AC to DC by rectifying the voltage, would be used to indicate the correct value of measured ______. ✔✔varying DC voltages only

in the drawing below, what is the current through the resistor? 10V 5Ω ✔✔2 amps

which of the below waveforms show approx. one complete cycle? ✔✔A and D

What is the peak voltage of the waveform below? (up 7V) ✔✔7v

which of the below would be the best test freq. for general audio troubleshooting? ✔✔1 KHz

what is the purpose of a coupling capacitor? ✔✔to pass ac signal while isolating dc part of circuit

which would be the most likely cause of hum in an amplifier, but only when switched to CD pos. ✔✔bad shilded cable from the cd to the amp input

distortion in an audio amp occurs when _____? ✔✔an amp stage input signal level is too high

oscillators use quartz crystals. what effect do these crystals show? ✔✔piezoelectric effect

this dc circuit will require how many rc time constants to charge the capacitor to 63% of the applied V? ✔✔ 1

which one of the following integrated circuit or semiconductor devices normally require the most careful handling to avoid damage by static electricity? ✔✔CMOS

an inductor with the same length of wire but whose coils are spaced further apart will have ______? ✔✔less inductance

what will happen to the current through a resistor if the resistor value suddenly decreases? ✔✔current increases

in the circuit below to reproduce the square wave input more faithfully at the output _____ ✔✔increase the value of the resistor

in the circuit below approx. what dc voltage would you see at A, if the plug was connected to 117v ac wall outlet? ✔✔10v

An inductor in an electronic circuit: ✔✔impedes the flow of ac current

in order for a capacitor to function as a coupling capacitor, Xc must be less than ______ at the lowest freq. at which the ac circuit is operating ✔✔0.1r

what determines the velocity factor in a transmission line? ✔✔the dielectric material of the line

which of the following is an appropriate use for a voltmeter ✔✔to measure difference of potential

cables of different impedances may be combines for short runs ✔✔false

a 4.8v battery delivers a current of 3a thru a external resistor 1.2 ohms. what is the internal resistance? ✔✔0.

as the input frequency to an operational amp. increases over a broad range, the output signal usually_______ ✔✔decreases

in a parallel RCL circuit, what voltage is applied across each branch? ✔✔total circuit voltage

the term for the combination of resistance that restricts the flow of AC is ✔✔impedance

the +5v level of a ttl digital signal is also most frequently called a logical? ✔✔1 or high

when measuring power to a speaker, a doubling of the power represents a 3 dB increase. ✔✔true

in the following operational amp. block diagram which input is inverting ✔✔a

when replacing a DIP chip, _____ ✔✔use an ESD static grounded soldering pencil or work station

a lead acid battery cell, when charged, has a nominal voltage of ____ ✔✔2.1 v

thermocouple outputs measure in the ___ range. ✔✔millivolt

calculate 10^5 x 10^-6 ✔✔10^-

Carbon microphones are much like variable: ✔✔resistors

the voltage rating of a capacitor _______ ✔✔relates to the maximum voltage that should be applied to it

which of the following circuit configurations has the same amount of voltage drop across each of its components ✔✔parallel

which of the answers below describes the filter shown below? ✔✔Low pass T

what is the combined reactance of the two capacitors in series in the circuit below? ✔✔approx. 1,194 ohms

what is the total capacitance of the circuit below? ✔✔2.67uF

Regarding Germanium diodes, they: ✔✔have approx. 0.3v forward voltage drop

a power supply is being serviced and has several 250 uF capacitors in parallel. to avoid shock from retained charge after disconnecting the power, these capacitors _______ ✔✔should be discharged to chassis ground with a suitable resistor

Negative Temperature Coefficient Thermistor will ✔✔decrease in resistance with heat

a dual trace scope has ______ ✔✔two vertical inputs

which one of the below will cause a generator to produce a DC voltage rather than AC voltage? ✔✔the commutator

a 3/8" diameter by 3/16" ceramic disk capacitor marked "47k" is what value? ✔✔47pF =-10%

an LCD if you needed_______ ✔✔a low current digital display

waveguides are not utilized at VHF frequencies bc ______ ✔✔resistance to high freq. is to high

the disassembled component below is an ✔✔BNC connector

the input of the op amp below is 5mV sine wave centered ab +1.5v. what will the output be? ✔✔10mV sine wave centered about -1.5v

Total power in a series circuit is determined by the: ✔✔source voltage multiplied by the current

what happens to current flow in a capacitive circiut as the charging voltage to a capacitor approaches full charge ✔✔little current flows

to insure proper circuit operation, how should a fuse be installed? ✔✔in series with the load

which of the answers below is equivalent to 100 microwatts ✔✔0.1 milliwatts

which of the following is within tolerance for a resistor color coded red, black, red, gold? ✔✔1900 ohms

instead of using a direct X1 probe on an oscilloscope, using a X10 probe has what effect on a circuit test? ✔✔it decreases circuit loading

Hexidecimal 2E is equivalent to the decimal number ✔✔ 46

what is the binary number for decimal number 6 ✔✔ 0110

before connecting an analog voltmeter into a dc circuit, what should be observed? ✔✔polarity

a logic pulser can be used as a ✔✔pulse generator

a test plan should contain which of the following? ✔✔all of the above

the transistor config. shown below is a ✔✔NPN

in the schematic diagram below, what will the voltages across each of the capacitors be ✔✔26.6v across the 2uF capacitor, 13.3v across the 4uF capacitor

which of the silicon diodes below will conduct given the applied voltages ✔✔a

the filter below is commonly called ✔✔a PI filter

the sine wave shown to the right is at what freq. ✔✔a

if the current measured form the battery is 4.5mA at what must the rheostat in the diagram below be set ✔✔2.5 K ohms

in the circuit below, how much current is flowing in R1 ✔✔1 amp

a three input NAND has two low inputs and a high input. what will the output be ✔✔high

Adding the binary numbers 110111 and 001101 will give which one of the results below? ✔✔ 1000100

if the gate voltage level, that turns an active SCR on, drops below the trigger point, while anode and cathode voltages are maintained, what will occur? ✔✔the SCR stays on