CETa Study Guide Exam 194 Questions with Verified Answers,100% CORRECT, Exams of Business Economics

Download CETa Study Guide Exam 194 Questions with Verified Answers,100% CORRECT and more Exams Business Economics in PDF only on Docsity! CETa Study Guide Exam 194 Questions with Verified Answers 8.33 meters is the full wavelength in air for what RF frequency? - CORRECT ANSWER 36 MHz Decimal 164 would appear as what in binary? - CORRECT ANSWER 10100100 A resistor has color stripes yellow, violet, violet, silver. It is? - CORRECT ANSWER 470 MegOhm +/- 10% What is the total capacitance of three capacitors valued at 100uf, 100uf and 50uf when connected in series? - CORRECT ANSWER 25 pf What is the ripple frequency of a full wave single phase bridge rectifier operated at 60 Hz? - CORRECT ANSWER 120 Hz What emits a voltage when heated or cooled? - CORRECT ANSWER Thermocouple Adding the binary numbers 101011 and 001110 will give you what result? - CORRECT ANSWER 111001 A component that reduces in resistance as it is heated. - CORRECT ANSWER A negative temperature coefficient thermistor An autotransformer - CORRECT ANSWER has a single winding A dual trace oscilloscope differs from a single trace in that only the dual trace scope: - CORRECT ANSWER alternates sweeps If an RF signal Voltage is reduced by 6db it is then : - CORRECT ANSWER half the original size Applying positive voltage to the P end and negative to the N end of a germanium diode: - CORRECT ANSWER will forward bias it You would probably prefer a digital VOM over an ordinary analog meter: - CORRECT ANSWER for most accuracy You should expect the video amplifier in a radar or TV receiver to have a frequency response of: - CORRECT ANSWER 0-6 MHzd The radio communication mode that utilizes the basic frequency and one of the side bands: - CORRECT ANSWER is called "SSB" When using fiber optic to transfer a signal, the light must: - CORRECT ANSWER enter the "cone of acceptance" The energy stored in a coil is measured in: - CORRECT ANSWER Henrys The telephone communication term "Cellular" refers to: - CORRECT ANSWER small geographic areas covered by each base station Integrated circuit failures often exhibit: - CORRECT ANSWER open or short conditions Which of these would you normally choose to cause an LED to light? - CORRECT ANSWER 3 VDC A capacitor (3/8"x1/8" ceramic or mica) marked 47K is: - CORRECT ANSWER 47 pf +/- 10% A "digital storage oscilloscope": - CORRECT ANSWER uses micro processing and memory to allow close analysis of signal. Carbon microphones are much like variable: - CORRECT ANSWER resistors An antenna that is longer than another: - CORRECT ANSWER will have a lower resonant frequency An 8 bit binary code allows how many logical combinations. - CORRECT ANSWER 256 A capacitor will charge to what percent of full charge in one RC time? - CORRECT ANSWER 63.2 Moving one plate of a capacitor further away from the other will: - CORRECT ANSWER decrease capacitance The fact that an inductor opposes any change in current is true of: - CORRECT ANSWER AC and DC signals If you increase the value of a capacitor, the capacitive reactance will: - CORRECT ANSWER decrease In checking a capacitor to see if it is really shorted, open or leaky: - CORRECT ANSWER you would use the highest ohm meter range. The capacitor in a power supply capacitive filter: - CORRECT ANSWER Is in parallel with the load The time required to discharge a capacitor depends on the: - CORRECT ANSWER combination of LRC across its terminals. With a given filter type, pure filtering is easiest with: - CORRECT ANSWER 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 ANSWER 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 ANSWER 20 Correctly connecting a properly rated zener diode across a power supply load will: - CORRECT ANSWER limit the output DC A triac in a power control circuit: - CORRECT ANSWER acts as an on/off switch What specification should not be of concern regarding wire conductors? - CORRECT ANSWER capacitance The normal open circuit voltage for each nickel-cadmium cell is approximately? - CORRECT ANSWER 1.2 volts Lead free type solder for electronics work is made from: - CORRECT ANSWER Silver and Tin Soldering stations used for electronics circuit-board work have historically been(approximately): - CORRECT ANSWER 30 Watts Solder flux mainly: - CORRECT ANSWER removes oxides on metals to be soldered Laminations used for the core of a transformer: - CORRECT ANSWER must be insulated from each other I=1 amp, R=10,000 ohms. What is the value of the voltage? - CORRECT ANSWER 10,000 volts If R=200 ohms and I=.02 amps. What is the value of P(power)? - CORRECT ANSWER .08 watts Which frequency will have a higher loss when using coaxial cable transmission line? - CORRECT ANSWER 1 Ghz What is a reference antenna that all other antennas with gain are compared to? - CORRECT ANSWER dipole A high frequency antenna is than a low frequency one. - CORRECT ANSWER is shorter Standing waves on a transmission cable: - CORRECT ANSWER can be caused by poor termination Sideband frequencies are produced when an radio carrier frequency is: - CORRECT ANSWER modulated Doubling the power in a transmitter output is a: - CORRECT ANSWER 3 db gain 0 db is what level of received TV signal? - CORRECT ANSWER 1000 microVolts A byte is: - CORRECT ANSWER 8 bits In a 3 input AND gate: - CORRECT ANSWER 3 input must be high for a high output An LCD operates by polarizing the light through filters. The fluid rotates the light: - CORRECT ANSWER 90 degrees To test an SCR with an ohmmeter. - CORRECT ANSWER 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 ANSWER 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 ANSWER High Which is least likely to cause ESD damage to MOSFET - CORRECT ANSWER flux A logic probe: - CORRECT ANSWER indicates high and low voltage conditions In a typical electrical generator a small DC voltage applied to the field windings: - CORRECT ANSWER is able to control the output level of the generator When working with and testing lead acid batteries - CORRECT ANSWER Always wear eye protection and never cause a spark Audio signals, such as the output from DVD players, satellite receivers and preamplifers, usually are of what amplitude for input to a TV, modulator or other equipment? - CORRECT ANSWER 1 voltage peak to peak Which of these signal parameters does a spectrum analyzer show? - CORRECT ANSWER Magnitude and frequency A schematic used in electronic: - CORRECT ANSWER 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 ANSWER 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 ANSWER The operating frequency If a 12v product is dissipating 50w, how much load resistance does the device represent? - CORRECT ANSWER 2.9 ohms An "audio signal" is defined as: - CORRECT ANSWER frequencies in the 20Hz to 15000Hz range What will cause a generator to produce DC voltage rather then AC? - CORRECT ANSWER the commutator You suspect the unit has an internal short. To prevent further damage when you apply power, you should: - CORRECT ANSWER insert a low resistance high wattage(100ohm, 10w) resistor in series with the power input. A ripple counter: - CORRECT ANSWER 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 ANSWER 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 ANSWER is part of a voltage doubler circuit Information travels through optic fiber via the flow of: - CORRECT ANSWER photons You would most likely prefer an analog VOM over a DMM for: - CORRECT ANSWER accuracy Which of these circuits would most likely use a zener diode? - CORRECT ANSWER a power regulator A block in a digital diagram is called a NOR. Which is true? - CORRECT ANSWER It is a NOT OR or Inverted OR Which of these statements is most true relating to schematic diagrams of electronic devices? - CORRECT ANSWER They represent signal paths In personal computer technology, ROM indicates: - CORRECT ANSWER memory that may only be read from A light emitting diode will light when: - CORRECT ANSWER It is forward biased. A zener diode is rated 6.3V. This tells you: - CORRECT ANSWER it conducts to limit the voltage across it to 6.3V A triac is frequently used: - CORRECT ANSWER for motor speed control, to electronically turn equipment on and off A technician must be knowledgeable about "ESD": - CORRECT ANSWER because static discharge can destroy many components. In a motor, the counter-emf voltage induced in the armature the source current. - CORRECT ANSWER subtracts from One significant difference between a TV antenna and a CB antenna would be: - CORRECT ANSWER TV is polarized horizontal while CB is vertical "Switching power supplies": - CORRECT ANSWER 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 ANSWER 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 ANSWER center tapped secondary transformer The 9 pin DB9 connector serial port on a PC is commonly called the: - CORRECT ANSWER RS232 standard Three capacitors, of 470pf, 560pf and .47pf are in parallel with each other. The total is: - CORRECT ANSWER 1030.47pf Ohm's law provides equations relating to: - CORRECT ANSWER 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 ANSWER A water tank Which of these is a good indication of the quality of an analog meter? - CORRECT ANSWER The ohms per volt rating The vertical axis of an oscilloscope display is also called the: - CORRECT ANSWER Y axis If you increase the value of an inductor, the inductive reactance will: - CORRECT ANSWER increase Which would least likely be a high-voltage(above 1000V) capacitor? - CORRECT ANSWER electrolytic The rechargeable cell currently used in many consumer portable products would be: - CORRECT ANSWER Lithium-ion A solid-state regulator: - CORRECT ANSWER Varies conduction to maintain a level output voltage To trace a logic path, you might use: - CORRECT ANSWER A logic pulser Ordinary alpha numeric information transmitted by a computer is converted to binary using: - CORRECT ANSWER an encoder In electronic devices what term refers to residual magnetism? - CORRECT ANSWER Hysteresis Some variable capacitors are made so the plates interleave. The capacitance varies as the plates open(separate) and close. As they open: - CORRECT ANSWER The capacitance decreases In VOM's voltage multiplier resistors are important: - CORRECT ANSWER in the voltage scales In a series tuned circuit, to increase the resonant frequency, you would need to: - CORRECT ANSWER decrease the inductance A mosfet: - CORRECT ANSWER amplifies signal voltage variations Torroid cones are used in transformers for: - CORRECT ANSWER concentrating the magnetic lines of flux A PLL or phase locked loop circuit, contains a VCO, or voltage controlled oscillator. The output of the VCO is an: - CORRECT ANSWER AC changing frequency signal A variable capacitor depends on: - CORRECT ANSWER the plate separation being adjustable While anode and cathode voltages are maintained the gate level in an SCR drops below the trigger point. What happens? - CORRECT ANSWER The SCR stays on The combination of resistance and reactance which restricts the flow of alternating current is called: - CORRECT ANSWER Impedance The output of a thermocouple would most likely be measured in: - CORRECT ANSWER millivolts The Z axis on an oscilloscope is: - CORRECT ANSWER intensity When soldering transistor or IC chip legs. What should be used to prevent overheating of the small discrete components/ - CORRECT ANSWER heat sink clip Which of the below would normally be used for the core of a transformer? - CORRECT ANSWER Ferrite The '1' in binary number 100000 carries a weight of: - CORRECT ANSWER 32 You would choose an LCD if you needed: - CORRECT ANSWER a low current digital display Germanium diodes: - CORRECT ANSWER normally drop about .3V with forward current RF signal propagation that is normally considered "live of sight" would be: - CORRECT ANSWER UHF