Download CET Unit 2-8 Exam Questions and Answers: Electronics and Electrical Engineering and more Exams Advanced Education in PDF only on Docsity!
CET UNIT 2 - 8 EXAM QUESTIONS AND CORRECT ANSWERS!!
Current through the resistor - ANSWER 2 amps Power dissipated in the resistor - ANSWER 24 watts Effect of increasing resistor value on current - ANSWER Current decreases Circuit type with same voltage drop across components - ANSWER Parallel Total power in a series circuit - ANSWER Source voltage times the current Equivalent to 100 microamps - ANSWER .1 milliamps Resistance of the rheostat with 4mA current drain - ANSWER 2.5k ohms Current flowing in R2 - ANSWER 1 amp Effect of decreasing plate spacing on capacitor value - ANSWER Increases Peak-to-peak voltage of the waveform - ANSWER 14V RC time constants to charge capacitor to 63% - ANSWER 1 Capacitance change as plates open - ANSWER Decreases
Inductor with spaced turns - ANSWER Less inductance Resonant frequency of parallel BC circuit - ANSWER 159 Hz Formula to calculate reactance - ANSWER XC=1/2PIEFC Inductor in an electrical circuit - ANSWER Opposes the flow of AC current Combination of resistance and reactance - ANSWER Impedance Identical value of 500 picofarad and .5 nanofarad capacitors - ANSWER Yes Control of output level in a generator - ANSWER True Tolerance for resistor color coded red, black, red, gold - ANSWER 1950 ohms Common description of the filter - ANSWER Low pass T Combined reactance of two capacitors in series - ANSWER Approximately 1,198 ohms Cause of generator producing DC voltage - ANSWER Commutator Total capacitance of capacitors in parallel - ANSWER Like resistors connected in series Factor determining the value of a capacitor - ANSWER Area of the plates Value of 3/8 inch diameter by 3/16 inch ceramic disk capacitor marked 47 - ANSWER
Transistor Configuration - ANSWER NPN Varactor (Varicap) Effect - ANSWER Capacitance decreases and the tuned frequencyincreases
Voltage at Point A - ANSWER 12.3V Regulator Circuit Output Voltage - ANSWER 85 V DC Square Wave Input Reproduction - ANSWER Increase the value of the resistor Expected Voltage at Point A with 117V AC - ANSWER 15.5 V DC Secondary Voltage of T1 Transformer - ANSWER 11.7 V AC Oscillator Output Generation - ANSWER Piezoelectric effect Analog Telephone Off-Hook Voltage - ANSWER -48 V DC Velocity Factor in Transmission Line - ANSWER Compared to free space velocity Combining Cables of Different Impedances - ANSWER False Bandwidth of Standard Definition Analog TV Signal - ANSWER 6MHz Radio Receiver Section for Noise Level - ANSWER RF
Carbon Microphones - ANSWER Much like variable resistors Replacement for Twisted Pair Cabling - ANSWER Wireless and fiber optics Coaxial Cable Resistance Measurement - ANSWER Indicates 50 ohms Partially shorted cable - ANSWER The cable is partially shorted. Waveguides at HF or VHF - ANSWER Large waveguide dimensions required at lowerfrequencies are not practical.
BNC - ANSWER The item shown below is a C BNC. +5V level of TTL signal - ANSWER The +5V level of a TTL digital signal is called a logical1 or high.
Decimal to binary conversion - ANSWER 165 (decimal) converted to binary would be10100101.
Binary weight - ANSWER The 1 in binary number 1000000 carries a decimal weight of64.
MOS handling - ANSWER MOS normally requires the most careful handling to avoiddamage by static electricity.
RAM - ANSWER RAM means random access memory. LC display - ANSWER An LC (liquid crystal display) is a low-current digital display.
Y axis of oscilloscope - ANSWER The Y axis of an oscilloscope is vertical. Discharging capacitors - ANSWER Capacitors should be discharged to chassis ground,with a suitable resistor.
Dual-trace scope - ANSWER A dual-trace scope has two sets of position controls andtwo vertical inputs.
x10 probe effect - ANSWER A x10 probe decreases circuit loading that a direct probepresents.
AC to DC voltmeter accuracy - ANSWER A voltmeter that converts AC to DC byrectifying the voltage would be least accurate measuring pulses.
Analog voltmeter connection - ANSWER When connecting an analog voltmeter into a DCcircuit, polarity should be observed.
Output with SW1 and SW2 open - ANSWER With both SW1 and SW2 open, the output willbe high.
Output if SW2 opens - ANSWER If SW2 were to open in the circuit above, the output ofthe gate circuit would be low.
Three input NAND output - ANSWER A three input NAND has two high inputs and a lowinput. The output will be high.
Adding binary numbers - ANSWER Adding the binary numbers 110111 and 001100 willgive 1000011.
Gain of non-inverting op-amp - ANSWER To calculate the gain of a non-invertingoperational amplifier, use 1+(Rf/Ri).
Op-Amp frequency effect - ANSWER If the frequency of the broadband input signal to anOp-Amp increases, then the output signal level decreases.
Power measurement and dB - ANSWER A doubling of the power represents a 6dBincrease.
Op-amp output for sine wave - ANSWER The input of the op-amp below is a .5V sinewave (centered about +2V). The output will be a 1V sine wave centered about -4V.
Circuit issue - ANSWER What is wrong with this circuit below? Diode grounds areshorting.
