CETA Exam Questions And Answers Verified
100% Correct
Parasitic Array - ANSWER- Consist of a driven element, usually a dipole. Concentrate
signals for transmission in the desired direction. Obtain energy for transmission from
electromagnetic coupling with driven element. For reception, transfers received energy
to the driven element. Highly directional.
Microwave antenna - ANSWER- Typically use a dish shaped reflector to concentrate
radiated energy into a beam.
Laminated iron and iron slugs - ANSWER- These type of transformer cores have a
significant effect on the coupling within a transformer
Toroid - ANSWER- These type of transformer cores concentrate the lines of force
Autotransformer - ANSWER- A single coil with unique winding and selective taps
Gas Diode - ANSWER- Effectively become a short when ignition threshold of gas
occurs between the plate and cathode.
Klystrons - ANSWER- Oscillate by themselves for a short period when cathode is
pulsed.
Magnetron - ANSWER- Operate in a frequency range higher than klystrons, and are
capable of much more power. Used by RADAR and microwave ovens.
Cathode Ray Tube - ANSWER- Uses an electron gun to emit electrons in the direction
of a phosphor coated surface such as a TV screen.
Shottky Diode - ANSWER- 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.
Laser Diode - ANSWER- 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.
, Tunnel Diode - ANSWER- 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.
Metal Oxide Varistor (MOV) - ANSWER- 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.
Varactor - ANSWER- Semiconductor with capacitive qualities. Capacitance can vary as
the applied reverse bias voltage changes.
Diac - ANSWER- Two zeners connected in reverse in parallel. Used in an AC
environment to turn on, or avalanche, when the design maximum bias is exceeded.
Triac - ANSWER- 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.
Thermacouple - ANSWER- 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.
Balun - ANSWER- Type of transformer that couples an unbalanced transmission line to
a balanced line.
SCR/Thyristor - ANSWER- 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.
Direct, capacitor, transformer - ANSWER- Three types of coupling used in cascading
amplifiers are:
0-0.6 Volts - ANSWER- A TTL device is a logic zero when voltage is between:
2-5 Volts - ANSWER- A TTL device is a logic one when voltage is between:
3.5-5 Volts - ANSWER- A CMOS device is a logic one when voltage is between:
0-1.5 Volts - ANSWER- A CMOS device is a logic zero when voltage is between:
100% Correct
Parasitic Array - ANSWER- Consist of a driven element, usually a dipole. Concentrate
signals for transmission in the desired direction. Obtain energy for transmission from
electromagnetic coupling with driven element. For reception, transfers received energy
to the driven element. Highly directional.
Microwave antenna - ANSWER- Typically use a dish shaped reflector to concentrate
radiated energy into a beam.
Laminated iron and iron slugs - ANSWER- These type of transformer cores have a
significant effect on the coupling within a transformer
Toroid - ANSWER- These type of transformer cores concentrate the lines of force
Autotransformer - ANSWER- A single coil with unique winding and selective taps
Gas Diode - ANSWER- Effectively become a short when ignition threshold of gas
occurs between the plate and cathode.
Klystrons - ANSWER- Oscillate by themselves for a short period when cathode is
pulsed.
Magnetron - ANSWER- Operate in a frequency range higher than klystrons, and are
capable of much more power. Used by RADAR and microwave ovens.
Cathode Ray Tube - ANSWER- Uses an electron gun to emit electrons in the direction
of a phosphor coated surface such as a TV screen.
Shottky Diode - ANSWER- 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.
Laser Diode - ANSWER- 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.
, Tunnel Diode - ANSWER- 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.
Metal Oxide Varistor (MOV) - ANSWER- 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.
Varactor - ANSWER- Semiconductor with capacitive qualities. Capacitance can vary as
the applied reverse bias voltage changes.
Diac - ANSWER- Two zeners connected in reverse in parallel. Used in an AC
environment to turn on, or avalanche, when the design maximum bias is exceeded.
Triac - ANSWER- 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.
Thermacouple - ANSWER- 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.
Balun - ANSWER- Type of transformer that couples an unbalanced transmission line to
a balanced line.
SCR/Thyristor - ANSWER- 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.
Direct, capacitor, transformer - ANSWER- Three types of coupling used in cascading
amplifiers are:
0-0.6 Volts - ANSWER- A TTL device is a logic zero when voltage is between:
2-5 Volts - ANSWER- A TTL device is a logic one when voltage is between:
3.5-5 Volts - ANSWER- A CMOS device is a logic one when voltage is between:
0-1.5 Volts - ANSWER- A CMOS device is a logic zero when voltage is between:
