CET PRACTICE EXAM 1 QUESTIONS
AND ANSWERS ALL CORRECT
Which frequency will have a higher loss when using coaxial cable transmission line? -
Answer- 1 GHz
What is a reference antenna that all other antennas with gain are compared to? -
Answer- Dipole
How does a high frequency antenna compare to a low frequency one? - Answer- Is
shorter
What can cause standing waves on a transmission cable? - Answer- Poor termination
When is sideband frequency produced in radio communication? - Answer- When a radio
carrier frequency is modulated
What is the dB gain when doubling the power in a transmitter output signal? - Answer- 3
dB
What level of received TV signal is 0 dBmV? - Answer- 1000 microvolts
What is a byte? - Answer- 8 bits
What must be true in a 3-input AND gate for a high output? - Answer- All three inputs
must be high
How does an LCD operate? - Answer- By polarizing light through filters, with fluid
rotating the light 90 degrees
How do you test an SCR with an ohmmeter? - Answer- With positive to anode and
negative to cathode, short gate and anode together; it should go from near open to near
short
What should readings be when testing between the source and drain of an N channel
JFET with the R x 100 range? - Answer- Equal in both directions
What will the internal resistance of an N channel JFET be with positive voltage to drain
or source and negative voltage to gate? - Answer- High
, What is least likely to cause ESD damage to a MOSFET? - Answer- Flux
What does a Logic Probe indicate? - Answer- High and low voltage conditions
Is a small AC voltage applied to the field windings able to control the output level of a
typical electrical generator? - Answer- False
What precautions should be taken when working with and testing lead-acid batteries? -
Answer- Always wear eye protection, never cause a spark, and charge in a ventilated
room
What is the typical amplitude of audio signals from DVD players, satellite receivers, and
preamplifiers for input to a TV or other equipment? - Answer- 1 volt peak-to-peak
What parameters does a spectrum analyzer show? - Answer- Magnitude and frequency
What type of data storage in a computer is permanent, non-volatile, and non-
removable? - Answer- ROM
What should be used first to clean a corroded plated soldering iron tip? - Answer- Flux,
cloth after heating
What should be done when soldering high voltage connections? - Answer- Leave the
terminal with a smooth and rounded covering of solder
What RF frequency corresponds to a full wavelength of 8.33 meters in air? - Answer- 36
MHz
What is the binary representation of decimal 164? - Answer- 10100100
What is the resistance value of a resistor with color stripes yellow, violet, violet, silver? -
Answer- 470 megohms ±10%
What is the total capacitance of three capacitors valued at 100 pF, 100 pF, and 50 pF in
series? - Answer- 25 pF
What is the ripple frequency of a full-wave single-phase bridge rectifier operated at 60
Hz? - Answer- 120 Hz
What device emits a voltage when heated or cooled? - Answer- Thermocouple
Which wire size is physically the largest? - Answer- #8
What is the result of adding the binary numbers 101011 and 001110? - Answer- 111001
AND ANSWERS ALL CORRECT
Which frequency will have a higher loss when using coaxial cable transmission line? -
Answer- 1 GHz
What is a reference antenna that all other antennas with gain are compared to? -
Answer- Dipole
How does a high frequency antenna compare to a low frequency one? - Answer- Is
shorter
What can cause standing waves on a transmission cable? - Answer- Poor termination
When is sideband frequency produced in radio communication? - Answer- When a radio
carrier frequency is modulated
What is the dB gain when doubling the power in a transmitter output signal? - Answer- 3
dB
What level of received TV signal is 0 dBmV? - Answer- 1000 microvolts
What is a byte? - Answer- 8 bits
What must be true in a 3-input AND gate for a high output? - Answer- All three inputs
must be high
How does an LCD operate? - Answer- By polarizing light through filters, with fluid
rotating the light 90 degrees
How do you test an SCR with an ohmmeter? - Answer- With positive to anode and
negative to cathode, short gate and anode together; it should go from near open to near
short
What should readings be when testing between the source and drain of an N channel
JFET with the R x 100 range? - Answer- Equal in both directions
What will the internal resistance of an N channel JFET be with positive voltage to drain
or source and negative voltage to gate? - Answer- High
, What is least likely to cause ESD damage to a MOSFET? - Answer- Flux
What does a Logic Probe indicate? - Answer- High and low voltage conditions
Is a small AC voltage applied to the field windings able to control the output level of a
typical electrical generator? - Answer- False
What precautions should be taken when working with and testing lead-acid batteries? -
Answer- Always wear eye protection, never cause a spark, and charge in a ventilated
room
What is the typical amplitude of audio signals from DVD players, satellite receivers, and
preamplifiers for input to a TV or other equipment? - Answer- 1 volt peak-to-peak
What parameters does a spectrum analyzer show? - Answer- Magnitude and frequency
What type of data storage in a computer is permanent, non-volatile, and non-
removable? - Answer- ROM
What should be used first to clean a corroded plated soldering iron tip? - Answer- Flux,
cloth after heating
What should be done when soldering high voltage connections? - Answer- Leave the
terminal with a smooth and rounded covering of solder
What RF frequency corresponds to a full wavelength of 8.33 meters in air? - Answer- 36
MHz
What is the binary representation of decimal 164? - Answer- 10100100
What is the resistance value of a resistor with color stripes yellow, violet, violet, silver? -
Answer- 470 megohms ±10%
What is the total capacitance of three capacitors valued at 100 pF, 100 pF, and 50 pF in
series? - Answer- 25 pF
What is the ripple frequency of a full-wave single-phase bridge rectifier operated at 60
Hz? - Answer- 120 Hz
What device emits a voltage when heated or cooled? - Answer- Thermocouple
Which wire size is physically the largest? - Answer- #8
What is the result of adding the binary numbers 101011 and 001110? - Answer- 111001
