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CET PRACTICE EXAM 1- 100
QUESTIONS AND ANSWERS RATED A+
8.33 meters is the full wavelength in air for what RF frequency ✔✔36 mhz
Decimal 164 would appear as ______ in Binary ✔✔ 10100100
A resistor has colorstripes yellow, voilet, silver it is ✔✔470 MegOhm +/- - 10 %
what is the total capacitance of three capacitors valued at 100 pf, 100 pf and 50 pf when connected in series ✔✔25pF
What is the ripple frequency of a full wave single phase bridge rectifier operated at 60Hz ✔✔ 120 Hz
When heated or cooled a __________ emits a voltage ✔✔Thermocouple
Which wire size is physically largest? ✔✔#
Adding the binary numbers 101011 and 001110 will give you what result ✔✔ 111001
A componet that reduces in resistance as it is heated ✔✔Is a negative tempature coefficent thermistor
An Autotransformer ✔✔Has a single winding
A dual trace oscilloscope differs from a single trace in that only the dual trace scope: ✔✔Alternates sweeps
If an RF signal voltage is reduced by 6 dB, it is then ✔✔Half the orginal size
Applying postive voltage to the P end and negative to the N end of a germanuim diode ✔✔Will foward bias it
You would probably prefer a digtal VOM over an ordinary analog meter ✔✔For most accuracy
A digital oscilloscope ✔✔A,B,C
Carbon microphones are much like varible ✔✔resistors
An antenna that is longer then another ✔✔will have lower resonat frequency
An 8 bit binary code allows ______ logical combinations ✔✔ 256
AN inductor in an electronic circuit: ✔✔resists AC current flow
A printer connected directly to a personal computer would use a _____ connection ✔✔USB or parallel Centronics
The digital method of representing characters by using combinations of zeros and one is called ✔✔Binary
Fm utilizes_____ where Am utilizes signal level varations ✔✔Frequency varations
What decimal number is represented by the binary number 01101010 ✔✔ 106
Decimal 50 would appear as ________ in hex ✔✔ 32
Of these choices,the display of a DMM would probably be: ✔✔LCD
A disadvatage of LCD (liquid crystal display) is: ✔✔Environmental tempature sensitivity
A series DC motor, with no load: ✔✔May be damaged by excessive speeds
Which motor maintians a constant speed with no changing loads ✔✔Shunt
A small power drill or electric mixer would probably be powered by a/an ______ motor ✔✔Series
The rotor in an induction motor is not connected to Ac or DC power ✔✔True
A fuse which fussable wire wrapped around a insulator is called ✔✔A Slo-Blo type fuse
The power transformer in a power supply ✔✔Might step voltages up or down
Which of the below would be considered "basic componets of a non-switching power supply" ✔✔Filter,Rectifier, Transformer
The average of a full sine wave rectified voltage is: ✔✔627x pk-pk
The ripple frequency for a half wave rectifier operating a 60 Hz electrical power is : ✔✔60Hz
The effective voltage of a 100v peak-to-peak sine wave is: ✔✔35.35 VAC
A pi filter is an inductor with: ✔✔A capcitor at each end to common
An inductor opposes any change in; ✔✔Current
A capacitor opposes any change in ✔✔Voltage
A capictor will charge to what percent of full charge in one RC time ✔✔63.
Moving one plate of a capacitor further away from the other will: ✔✔Decreases capacitance
The fact than an inductor opposes any change in current is true of ✔✔AC and DC signals
If you increase the value of a capacitor, the capactive reactance will ✔✔Decrease
In checking a capcitor to see if it is shorted, open or leaky, you would use the______ ohm meter ✔✔Highest
The capacitor ina power supply capactive filter; ✔✔Is in parallel with the load
The time required to discharge a capacitor depends on the _______________ across its terminals ✔✔The combination of LRC
The normal open circuit voltage for each nickelcadmuim cell is approximatley_________ ✔✔1.
Lead-free type solder for electronics work is made from; ✔✔Silver and tin
Soldering stations used for electronics circuit-board work have historically been (approx) ✔✔ 30 watts
Solder flux mainly ✔✔Removes oxides on metals to be soldered
Laminations used for ther core of a transformer ✔✔Must be insulated from each other
I=1amp, R=10,000 ohms what is the value of the voltage ✔✔10,000 volts
If R=200 ohms and I=0.2 amps What is the value of P(power) ✔✔.08 watts
Which frequency will have a higher loss when using coaxial cable transmission line? ✔✔1GHz
A_________ is a refernce antenna that all other antennas with gain are compared to ✔✔Dipole
A high frequency antenna_________ than a low frequecny one. ✔✔Is shorter
Standing waves ona transmission line; ✔✔Can be caused by poor termination
Sideband frequencies are produced when a radio carrier frequency is; ✔✔Modulated
Doubling the power transmitter output signal is a ________ dB gain ✔✔ 3
0dBmV is what level of recieved TV signal ✔✔1000 microvolts
A byte is; ✔✔8 bits
In a 3-input AND gate ; ✔✔3 inputs must be high for a high input
An LCD operates by polerizing the light through filters, the fluid rotates the light ________ degrees ✔✔ 90
Audio signals, such as the output from DVD players satillite recievers and preamplifiers, usually are of what amplitude for input to a TV, modulator or other equipment ✔✔1 volt peak to peak
Which of these signal parameters does a spectrum analyzer show ✔✔Magnitude and frequency
Permant, non-volatile, non-removable, data storage ina computer is ✔✔ROM
What should be used first to clean a corroded plated soldering iron tip ✔✔Flux, cloth after heating
When soldeirng high voltage connections ✔✔Leave the terminal with a smooth and rounded covering the solder
Class AB operation of an audio amplifier means that current flows through the active device(tube transistor, FET, IC) for ___________ degrees of the input signal wave ✔✔More then 180 but less then 360
