CETA Final Exam Questions And Answers Verified 100% Correct

CETA Final Exam Questions And Answers Verified 100% Correct Typically use a dish shaped reflector to concentrate radiated energy into a beam. - ANSWER Microwave antenna These type of transformer cores have a significant effect on the coupling within a transformer - ANSWER Laminated iron and iron slugs These type of transformer cores concentrate the lines of force - ANSWER Toroid A single coil with unique winding and selective taps - ANSWER Autotransformer Effectively become a short when ignition threshold of gas occurs between the plate and cathode. - ANSWER Gas Diode Oscillate by themselves for a short period when cathode is pulsed. - ANSWER Klystrons Operate in a frequency range higher than klystrons, and are capable of much more power. Used by RADAR and microwave ovens. - ANSWER Magnetron Uses an electron gun to emit electrons in the direction of a phosphor coated surface such as a TV screen. - ANSWER Cathode Ray Tube A metal/metal oxide diode. Performs very well at higher frequencies, conducts high current and has lower losses than other diode types, Found in "switching" (DC-DC converter) power supplies. - ANSWER Shottky Diode Emits a light when turned on. That light is a very small beam, is very coherent and may be modulated. They are an inexpensive substitute for a true laser and are used in many printers. - ANSWER Laser Diode Using special "doping" techniques, these are very unique. Conduct at different rates and different bias levels. Used in amplification, switching, oscillators, and other special applications. - ANSWER Tunnel Diode Special type of diode that is designed to conduct in either direction when a certain reverse bias level is exceeded, and is able to dissipated an extreme amount of energy. Totally destruct when their maximum energy level is reached, thus protecting circuits to the maximum. Are not polarity sensitive and are the basis of the best surge suppressors. - ANSWER Metal Oxide Varistor (MOV) Semiconductor with capacitive qualities. Capacitance can vary as the applied reverse bias voltage changes. - ANSWER Varactor Two zeners connected in reverse in parallel. Used in an AC environment to turn on, or avalanche, when the design maximum bias is exceeded. - ANSWER Diac Appears as two diodes of opposite polarity, parallel to each other and containing a gate like the SCR. Gate might be activated by a digital electronic signal or a mechanical switch to act as an ON/OFF switch. - ANSWER Triac Junction between two different metals that produces a voltage related to a temperature difference. Widely used type of temperature sensor for measurement and control and can also be used to convert heat into electric power. Output varies, but is most often less than 100 microvolts per degree of temperature change. - ANSWER Thermacouple Type of transformer that couples an unbalanced transmission line to a balanced line. - ANSWER Balun Four layers of N and P material. With gate positive, turns on and current flow takes place. Can only be turned off by removing anode potential. used as high speed switches, can rectify controlled amounts of AC power. - ANSWER SCR/Thyristor Three types of coupling used in cascading amplifiers are: - ANSWER Direct, capacitor, transformer A TTL device is a logic zero when voltage is between: - ANSWER 0-0.6 Volts A TTL device is a logic one when voltage is between: - ANSWER 2-5 Volts A CMOS device is a logic one when voltage is between: - ANSWER 3.5-5 Volts A CMOS device is a logic zero when voltage is between: - ANSWER 0-1.5 Volts Generates a single pulse (sometimes referred to as a one-shot) - ANSWER Monostable Gives a "clean" high or low (sometimes referred to as a latch) - ANSWER Bistable Produces a series of square pulses sometimes referred to as a free running or clock) - ANSWER Astable Called the product of the sums, created using zero outputs. - ANSWER maxterm Called sum of the products, created using ones outputs. - ANSWER minterm