CET PRACTICE EXAM 2 QUESTIONS
AND ANSWERS ALL CORRECT
What is the term for the combination of resistance and reactance that restricts the flow
of alternating current? - Answer- Impedance
What is the output of a thermocouple most likely measured in? - Answer- Millivolts
What is the Z axis on an oscilloscope? - Answer- Intensity
What should be used when soldering transistor or IC chip legs to prevent overheating? -
Answer- Heat sink clip
What material is normally used for the core of a transformer? - Answer- Ferrite
What weight does the '1' in binary number 100000 carry? - Answer- 32
When would you choose an LCD? - Answer- If you needed a low current digital display
What is the forward voltage drop of germanium diodes? - Answer- Normally about 0.3 V
What is a track on a computer removable disk divided into? - Answer- Sectors
What is another name for internal memory types in PCs? - Answer- Cache
Which video system has the highest resolution? - Answer- XVGA
What would you use a dual trace oscilloscope to measure? - Answer- Signal differences
between two points
What are the Common Intermediate Frequencies (IF's) for AM and FM commercial
broadcast receivers? - Answer- 455 kHz and 10.7 MHz
What does analog radio receiver signal compression do? - Answer- Reduces the high
frequency received signal amplitude
What causes coaxial cable line losses at RF frequencies? - Answer- Wire resistance,
capacitive reactance, and inductive reactance
, What approximate RMS level would you expect the signal input into an audio amplifier
to be? - Answer- 1,000 millivolts
Where is the noise level in a radio receiver mostly generated? - Answer- RF section
What is the fast charging rate for a NiCad or Ni-MH battery not to exceed? - Answer-
10% of its AHr rating
Which component in a PC would be part of disk operations? - Answer- SATA or IDE
controller
What can an LED be used as? - Answer- A fiber optic signal source
What may a dual-trace oscilloscope have? - Answer- A Z input for intensity modulation
What determines the gain of an op-amp connected as an inverting amplifier? - Answer-
The external feedback and input resistors
Are diodes made from one type of material? - Answer- False
What propagation condition is significant for a UHF signal to be received at a distance
of 500 miles? - Answer- Tropospheric ducting
What is the output of a three input NAND with two low inputs and one high input? -
Answer- High
What is considered a component of a 'basic' power supply? - Answer- Diode rectifier
How is a 'Video signal' defined? - Answer- Baseband including visual information
What should you do to avoid shock when servicing a power supply with several 250 uF
capacitors connected in parallel? - Answer- Discharge to chassis ground through a
suitable resistor
What is a schematic used in electronic servicing similar to? - Answer- A road map for
following signals
How should high voltage be discharged before servicing a product? - Answer- Draining
through a large value resistor to chassis ground
What is an important electrical consideration in the use of a transformer? - Answer- The
operating frequency
If a 12V product is dissipating 50W, what is the load resistance? - Answer- 2.9 ohms
AND ANSWERS ALL CORRECT
What is the term for the combination of resistance and reactance that restricts the flow
of alternating current? - Answer- Impedance
What is the output of a thermocouple most likely measured in? - Answer- Millivolts
What is the Z axis on an oscilloscope? - Answer- Intensity
What should be used when soldering transistor or IC chip legs to prevent overheating? -
Answer- Heat sink clip
What material is normally used for the core of a transformer? - Answer- Ferrite
What weight does the '1' in binary number 100000 carry? - Answer- 32
When would you choose an LCD? - Answer- If you needed a low current digital display
What is the forward voltage drop of germanium diodes? - Answer- Normally about 0.3 V
What is a track on a computer removable disk divided into? - Answer- Sectors
What is another name for internal memory types in PCs? - Answer- Cache
Which video system has the highest resolution? - Answer- XVGA
What would you use a dual trace oscilloscope to measure? - Answer- Signal differences
between two points
What are the Common Intermediate Frequencies (IF's) for AM and FM commercial
broadcast receivers? - Answer- 455 kHz and 10.7 MHz
What does analog radio receiver signal compression do? - Answer- Reduces the high
frequency received signal amplitude
What causes coaxial cable line losses at RF frequencies? - Answer- Wire resistance,
capacitive reactance, and inductive reactance
, What approximate RMS level would you expect the signal input into an audio amplifier
to be? - Answer- 1,000 millivolts
Where is the noise level in a radio receiver mostly generated? - Answer- RF section
What is the fast charging rate for a NiCad or Ni-MH battery not to exceed? - Answer-
10% of its AHr rating
Which component in a PC would be part of disk operations? - Answer- SATA or IDE
controller
What can an LED be used as? - Answer- A fiber optic signal source
What may a dual-trace oscilloscope have? - Answer- A Z input for intensity modulation
What determines the gain of an op-amp connected as an inverting amplifier? - Answer-
The external feedback and input resistors
Are diodes made from one type of material? - Answer- False
What propagation condition is significant for a UHF signal to be received at a distance
of 500 miles? - Answer- Tropospheric ducting
What is the output of a three input NAND with two low inputs and one high input? -
Answer- High
What is considered a component of a 'basic' power supply? - Answer- Diode rectifier
How is a 'Video signal' defined? - Answer- Baseband including visual information
What should you do to avoid shock when servicing a power supply with several 250 uF
capacitors connected in parallel? - Answer- Discharge to chassis ground through a
suitable resistor
What is a schematic used in electronic servicing similar to? - Answer- A road map for
following signals
How should high voltage be discharged before servicing a product? - Answer- Draining
through a large value resistor to chassis ground
What is an important electrical consideration in the use of a transformer? - Answer- The
operating frequency
If a 12V product is dissipating 50W, what is the load resistance? - Answer- 2.9 ohms
