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8.33 meters is the full wavelength in air for what RF frequency? - correct answers ✅36 MHz Decimal 164 would appear as what in binary? - correct answers ✅ 10100100 A resistor has color stripes yellow, violet, violet, silver. It is? - correct answers ✅470 MegOhm +/- 10% What is the total capacitance of three capacitors valued at 100uf, 100uf and 50uf when connected in series? - correct answers ✅25 pf What is the ripple frequency of a full wave single phase bridge rectifier operated at 60 Hz? - correct answers ✅120 Hz What emits a voltage when heated or cooled? - correct answers ✅Thermocouple Adding the binary numbers 101011 and 001110 will give you what result? - correct answers ✅ 111001 A component that reduces in resistance as it is heated. - correct answers ✅A negative temperature coefficient thermistor
An autotransformer - correct answers ✅has a single winding A dual trace oscilloscope differs from a single trace in that only the dual trace scope: - correct answers ✅alternates sweeps If an RF signal Voltage is reduced by 6db it is then : - correct answers ✅half the original size Applying positive voltage to the P end and negative to the N end of a germanium diode: - correct answers ✅will forward bias it You would probably prefer a digital VOM over an ordinary analog meter: - correct answers ✅for most accuracy You should expect the video amplifier in a radar or TV receiver to have a frequency response of: - correct answers ✅0-6 MHzd The radio communication mode that utilizes the basic frequency and one of the side bands: - correct answers ✅is called "SSB"
An antenna that is longer than another: - correct answers ✅will have a lower resonant frequency An 8 bit binary code allows how many logical combinations. - correct answers ✅ 256 An inductor in an electronic circuit: - correct answers ✅resists AC current flow A printer directly connected to a personal computer would use what kind of connection? - correct answers ✅usb or parallel centronics The digital method of representing characters by using combinations of zeros and ones is called: - correct answers ✅Binary AM utilizes signal level variations where FM utilizes : - correct answers ✅Frequency variations What decimal number is represented by the binary number 01101010? - correct answers ✅ 106 Decimal 50 would appear as what number in Hex? - correct answers ✅ 32
The display of a DMM would probably be: - correct answers ✅LCD A disadvantage of LCD is: - correct answers ✅Environmental temperature sensitivity A series DC motor with no load: - correct answers ✅maybe damaged by excessive speed Which motor maintains a constant speed with changing load? - correct answers ✅Shunt A small power drill or electric mixer would probably be powered by a - correct answers ✅Series Motor 0 db when referring to audio signals means: - correct answers ✅decibels referenced to 1 milliwatt If a class A differential amplifier is using only one of its two possible inputs, what will the output shape be? - correct answers ✅Exactly the same as the one input Voltage is: - correct answers ✅Potential difference between two points
The ripple frequency for a half wave rectifier operating from 60 Hz electrical power is: - correct answers ✅60 HZ The effective voltage of a 100v Peak-to-peak sine wave is: - correct answers ✅35.35 VAC A pi filter is an inductor with: - correct answers ✅A capacitor at each end to common An inductor opposes any change in: - correct answers ✅current A capacitor opposes any change in: - correct answers ✅voltage A capacitor will charge to what percent of full charge in one RC time? - correct answers ✅63. Moving one plate of a capacitor further away from the other will: - correct answers ✅decrease capacitance The fact that an inductor opposes any change in current is true of: - correct answers ✅AC and DC signals
If you increase the value of a capacitor, the capacitive reactance will: - correct answers ✅decrease In checking a capacitor to see if it is really shorted, open or leaky: - correct answers ✅you would use the highest ohm meter range. The capacitor in a power supply capacitive filter: - correct answers ✅Is in parallel with the load The time required to discharge a capacitor depends on the: - correct answers ✅combination of LRC across its terminals. With a given filter type, pure filtering is easiest with: - correct answers ✅High frequencies A power supply whose output voltage does not change whether the load is light or heavy would have what percent of regulation? - correct answers ✅ 0 A power supply which measures 50 volts when under a small load and 40 volts under a heavy load has what percent regulation using the % of regulation formula(%=(EnL-EfL)/EfLX100)? - correct answers ✅ 20
I=1 amp, R=10,000 ohms. What is the value of the voltage? - correct answers ✅10,000 volts If R=200 ohms and I=.02 amps. What is the value of P(power)? - correct answers ✅.08 watts Which frequency will have a higher loss when using coaxial cable transmission line? - correct answers ✅ 1 Ghz What is a reference antenna that all other antennas with gain are compared to? - correct answers ✅dipole A high frequency antenna is than a low frequency one. - correct answers ✅is shorter Standing waves on a transmission cable: - correct answers ✅can be caused by poor termination Sideband frequencies are produced when an radio carrier frequency is: - correct answers ✅modulated Doubling the power in a transmitter output is a: - correct answers ✅3 db gain
0 db is what level of received TV signal? - correct answers ✅1000 microVolts A byte is: - correct answers ✅8 bits In a 3 input AND gate: - correct answers ✅3 input must be high for a high output An LCD operates by polarizing the light through filters. The fluid rotates the light: - correct answers ✅ 90 degrees To test an SCR with an ohmmeter. - correct answers ✅with + to anode and - to cathode, short gate and anode together Using the Rx100 range and testing between the source and drain of an N channel JFET: - correct answers ✅readings should be equal in both directions With + voltage to drain or source and a - voltage to the gate on an N channel JFET, internal resistance of the JFET will be: - correct answers ✅High Which is least likely to cause ESD damage to MOSFET - correct answers ✅flux
What should be used first to clean a corroded plated soldering iron tip? - correct answers ✅flux, cloth and heating When soldering high voltage connections: - correct answers ✅Leave the terminal with a smooth and rounded covering of solder Class AB operation of an audio amplifier means that current flows through the active device(tube, transistor,FET,IC) for how many degrees of the input signal wave? - correct answers ✅more than 180 but less then 360 A track on a computer disk is: - correct answers ✅divided into sectors A PC has conventional RAM and ROM memory area(in a PC it is 0 to 640 kilobytes); upper memory area( kilobytes to 1 meg) and extended memory area(above 1 meg). What other names for internal memory types do PCs have? - correct answers ✅Tape Drive Which video system has the highest resolution? - correct answers ✅XVGA
You would want to use a dual trace oscilloscope to measure: - correct answers ✅signal difference between two points Common Intermediate Frequencies(IF's) and FM commercial broadcast receivers are: - correct answers ✅455 MHz and 10.7MHz Analog radio receiver signal compression: - correct answers ✅reduces the high frequency received signal amplitude Coaxial cable line losses at RF frequencies are due to: - correct answers ✅wire resistance, capacitive and inductive reactance You are troubleshooting audio reproduction equipment and measure the signal to be input into the audio amplifier. What approximate RMS level would you expect the signal to be? - correct answers ✅1000 millivolts The noise level in a radio receiver is generated mostly in the: - correct answers ✅RF section The fast charging rate for a NiCad of Ni-Mh battery should not exceed: - correct answers ✅10% of its AHr or ampere hour rating
You are servicing a power supply and have disconnected power. It has several 250 uf capacitors connected in parallel. To avoid shock these capacitors: - correct answers ✅Should be discharged to chassis ground, through a suitable resistor A schematic used in electronic: - correct answers ✅is much like a road map for following signals High voltage should be discharged before servicing a product. After disabling AC input power, discharge a high voltage power source by: - correct answers ✅draining thru a large value resistor to chassis ground Which of these would be an important electrical consideration in the use of a transformer? - correct answers ✅The operating frequency If a 12v product is dissipating 50w, how much load resistance does the device represent? - correct answers ✅2.9 ohms An "audio signal" is defined as: - correct answers ✅frequencies in the 20Hz to 15000Hz range
What will cause a generator to produce DC voltage rather then AC? - correct answers ✅the commutator You suspect the unit has an internal short. To prevent further damage when you apply power, you should: - correct answers ✅insert a low resistance high wattage(100ohm, 10w) resistor in series with the power input. A ripple counter: - correct answers ✅Is two or more logical flip-flops connected sequentially with the input pulses toggling the first one When voltage is applied to a capacitor: - correct answers ✅current is maximum at first, then reduces as the capacitor becomes charges. An electrolytic capacitor in series between the power transformer and the rectifiers in a power supply: - correct answers ✅is part of a voltage doubler circuit Information travels through optic fiber via the flow of: - correct answers ✅photons You would most likely prefer an analog VOM over a DMM for: - correct answers ✅accuracy
In a motor, the counter-emf voltage induced in the armature the source current. - correct answers ✅subtracts from One significant difference between a TV antenna and a CB antenna would be: - correct answers ✅TV is polarized horizontal while CB is vertical "Switching power supplies": - correct answers ✅sometimes called DC to DC converters, maybe operated of AC or DC sources Which of these would you likely find in a DC motor speed control circuit? - correct answers ✅An op-amp A transformer on a schematic has two leads connected to the primary and three to the secondary, one to each end and one in the middle. This is an: - correct answers ✅center tapped secondary transformer The 9 pin DB9 connector serial port on a PC is commonly called the: - correct answers ✅RS232 standard
Three capacitors, of 470pf, 560pf and .47pf are in parallel with each other. The total is: - correct answers ✅1030.47pf Ohm's law provides equations relating to: - correct answers ✅Volts, amps and resistance A power source such as a generator or battery might be compared to what component in a water supply system? - correct answers ✅A water tank Which of these is a good indication of the quality of an analog meter? - correct answers ✅The ohms per volt rating The vertical axis of an oscilloscope display is also called the: - correct answers ✅Y axis If you increase the value of an inductor, the inductive reactance will: - correct answers ✅increase Which would least likely be a high-voltage(above 1000V) capacitor? - correct answers ✅electrolytic
