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CET Study Guide Questions and
Answers Rated A+
The "1" in binary number carries a decimal weight of ___________. ✔✔ 32
Which of these is within tolerance for a resistor that is color coded red, black, red and gold? ✔✔2000 and 1900 ohm's
Which would be the most likely cause of hum in an amplifier- but only when it is switched to the CD position? ✔✔Bad shielded cable from the CD to the amplifier input
When measuring power to a speaker, a doubling of the power represents a 3 dB increase. ✔✔True
A voltmeter that converts AC to DC by rectifying the voltage would be used to indicate the correct value of measured _______. ✔✔Sine waves
Regarding PC's, what does "RAM" mean? ✔✔Random Access memory
What is the binary number for decimal number 6? ✔✔ 0110
In order for a capacitor to function as a coupling capacitor, Xc, must be less than ______ at the lowest frequency at which the AC circuit is operating. ✔✔0.1 R
The term for the combination of resistance and reactance that restricts the flow of alternating current is _______. ✔✔Impedance
Adding the binary numbers 110111 and 001101 will give which one of these results? ✔✔ 1000100
How should a fuse be installed in a circuit to ensure proper operation? ✔✔In series with the load
A lead-acid battery cell, when charged, has a nominal value of ________. ✔✔3.4 volts
Common analog telephone lines, on hook, may be expected to have what DC voltage level on one of the wires? ✔✔-48 v
When replacing a DIP chip, ____________. ✔✔Use ESD static grounded soldering pencil or work station
What is the equivalent to microwatts? ✔✔0.1 milliwatts
Oscillators use quartz crystals. What effect do these crystals show? ✔✔Piezoelectric effect
Prior to connecting an analog voltmeter into a DC circuit, what should be observed? ✔✔polarity
An audio amplifier has severe hum whether CD, AUX, FM, or AM radio are selected. What is the most likely cause? ✔✔Power supply filtering is bad
The voltage rating of a capacitor _______________. ✔✔Relates to the maximum voltage that should be applied to it
Total capacitance of capacitors connected in parallel is like _____________. ✔✔resistors connected in series
You would choose an LCD (liquid crystal display) if you needed ________________. ✔✔A low-current display
What is the effect on a varactor (varicap) when the reverse bias is increased? ✔✔capacitance decreases and the tuned frequency increases
Hexadecimal 2E is equivalent to a decimal number _____________. ✔✔ 46
Cables of different impedances may be combined for short runs. ✔✔false
In a parallel RLC, what voltage is applied across each branch? ✔✔total circuit voltage
Distortion in an audio amplifier occurs when _____________. ✔✔an amplifier stage input signal level is too high
What happens to current flow in a capacitive circuit as the charging voltage to a capacitor approaches full charge? ✔✔Little current flows
If a co-worker is found unconscious due to electrical shock, after insuring any hazard is removed and verifying there is no danger you should then ________. ✔✔If qualified, properly administer CPR after seeking medical assistance
Instead of using a direct (X1) probe on an oscilloscope, using an X10 probe has what effect on a circuit test? ✔✔It decreases circuit loading
A 4.8 V battery cell delivers a current of 3A through an external resistance of 1.2 ohms. Calculate the internal resistance in ohms. ✔✔0.
A negative temperature coefficient thermistor will______________. ✔✔decrease in resistance with heat
A test plan should contain which of the following? ✔✔all of the above
The video amplifier for a TV receiver or radar will have a frequency response of ___________________. ✔✔0Hz - 4MHz
Diode semiconductors are marked with a band at the __________ end. ✔✔Cathode
The +5V level of a TTL digital signal is also most frequently called a logical ______________. ✔✔1 or high
A logic pulser can be used as a ____________. ✔✔Pulse generator
Waveguides are not utilized at VHF or UHF frequencies because _____________. ✔✔large waveguide dimensions as required at lower frequencies are not practical
