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CET study guide questions and answers
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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
