ATT COMP EXAMS SCRIPT QUESTIONS AND SOLUTIONS
MARKED A+
✔✔Type of switches - ✔✔Toggle, slide, rotary, and push button. Single or double pole
and throw.
✔✔Fuses and circuit breakers are both protection devices, however, while fuses are not
____________, circuit breakers are. - ✔✔reusable
✔✔Are capacitors circuit protection devices? - ✔✔No.
✔✔A _______ ________ fuse will typically blow in about one second, while a ________
________ could take 1-30 seconds. - ✔✔Fast acting; slow blow
✔✔What happens to the current path if the wire in a fuse melts? - ✔✔It stops.
✔✔What do the following letters mean in a basic schematic diagram? C, D, Q, S, T, TP,
AVC - ✔✔C - Capacitor, D - Diode, Q - Transmitter, S - Switch, T-Transformer, TP -
Test Point, AVC - Automatic Volume Control
✔✔voltage drop - ✔✔The difference in voltage across an electrical device that has
current flowing through it.
✔✔Applied voltage - ✔✔Sum of all voltage drops in the circuit.
✔✔Faults in series are: - ✔✔Open, Short, Changed value
✔✔What are the four basic TS steps? - ✔✔A)Analyze circuit
B)Check Setup
C)Calculate/measure values
D)Check Results
✔✔What fault provides no resistance to current flow? - ✔✔A short.
✔✔What fault causes resistance to increase or decrease? - ✔✔A changed value.
✔✔What fault causes current to stop? - ✔✔An open.
✔✔In a series parallel open, current ___________ in parallel and series, while the
voltage drop ____________ due to an ______________ in total resistance. -
✔✔decreases; increases; increase
✔✔TS procedures should be __________ and ____________. - ✔✔logical; systematic
, ✔✔An open wire will measure ___________ resistance. - ✔✔maximum
✔✔Current is measured in an open circuit when the leads are placed in what way? -
✔✔Across the open.
✔✔Shorts have a voltage drop of ____. - ✔✔zero
✔✔What three characteristics needed for sine wave? - ✔✔Frequency, period,
wavelength.
✔✔Wavelength is what? - ✔✔The actual distance between the beginning and end of a
cycle.
✔✔What is induction? - ✔✔The generation of AC current by passing a conductor
through a magnetic field.
✔✔How many cycles per second is a frequency of 100 Hz? - ✔✔100.
✔✔To induce a current, three things are needed: - ✔✔A conductor, a magnetic field,
and relative motion
✔✔Peak value is: - ✔✔The voltage or current value of a waveform at its maximum
positive or negative points.
✔✔How effective is AC vs DC? - ✔✔AC is only 70.7% as effective as DC.
✔✔What is peak-to-peak voltage? - ✔✔Voltage of a sine wave measured from the most
negative to the most positive point.
✔✔What is the formula for finding a period of a wavelength? - ✔✔T = 1/f
✔✔What is the period of a 100 Hz sine wave? - ✔✔0.01
✔✔Formula for a wavelength? - ✔✔(300 X 10^6)/f
✔✔What quantity cannot be measured directly or derived from oscilloscope? -
✔✔Resistance
✔✔A/an ___________ is a component that has the ability to concentrate a magnetic
field. - ✔✔inductor
✔✔What are the three types of inductors? - ✔✔Air core, iron core, and variable.
MARKED A+
✔✔Type of switches - ✔✔Toggle, slide, rotary, and push button. Single or double pole
and throw.
✔✔Fuses and circuit breakers are both protection devices, however, while fuses are not
____________, circuit breakers are. - ✔✔reusable
✔✔Are capacitors circuit protection devices? - ✔✔No.
✔✔A _______ ________ fuse will typically blow in about one second, while a ________
________ could take 1-30 seconds. - ✔✔Fast acting; slow blow
✔✔What happens to the current path if the wire in a fuse melts? - ✔✔It stops.
✔✔What do the following letters mean in a basic schematic diagram? C, D, Q, S, T, TP,
AVC - ✔✔C - Capacitor, D - Diode, Q - Transmitter, S - Switch, T-Transformer, TP -
Test Point, AVC - Automatic Volume Control
✔✔voltage drop - ✔✔The difference in voltage across an electrical device that has
current flowing through it.
✔✔Applied voltage - ✔✔Sum of all voltage drops in the circuit.
✔✔Faults in series are: - ✔✔Open, Short, Changed value
✔✔What are the four basic TS steps? - ✔✔A)Analyze circuit
B)Check Setup
C)Calculate/measure values
D)Check Results
✔✔What fault provides no resistance to current flow? - ✔✔A short.
✔✔What fault causes resistance to increase or decrease? - ✔✔A changed value.
✔✔What fault causes current to stop? - ✔✔An open.
✔✔In a series parallel open, current ___________ in parallel and series, while the
voltage drop ____________ due to an ______________ in total resistance. -
✔✔decreases; increases; increase
✔✔TS procedures should be __________ and ____________. - ✔✔logical; systematic
, ✔✔An open wire will measure ___________ resistance. - ✔✔maximum
✔✔Current is measured in an open circuit when the leads are placed in what way? -
✔✔Across the open.
✔✔Shorts have a voltage drop of ____. - ✔✔zero
✔✔What three characteristics needed for sine wave? - ✔✔Frequency, period,
wavelength.
✔✔Wavelength is what? - ✔✔The actual distance between the beginning and end of a
cycle.
✔✔What is induction? - ✔✔The generation of AC current by passing a conductor
through a magnetic field.
✔✔How many cycles per second is a frequency of 100 Hz? - ✔✔100.
✔✔To induce a current, three things are needed: - ✔✔A conductor, a magnetic field,
and relative motion
✔✔Peak value is: - ✔✔The voltage or current value of a waveform at its maximum
positive or negative points.
✔✔How effective is AC vs DC? - ✔✔AC is only 70.7% as effective as DC.
✔✔What is peak-to-peak voltage? - ✔✔Voltage of a sine wave measured from the most
negative to the most positive point.
✔✔What is the formula for finding a period of a wavelength? - ✔✔T = 1/f
✔✔What is the period of a 100 Hz sine wave? - ✔✔0.01
✔✔Formula for a wavelength? - ✔✔(300 X 10^6)/f
✔✔What quantity cannot be measured directly or derived from oscilloscope? -
✔✔Resistance
✔✔A/an ___________ is a component that has the ability to concentrate a magnetic
field. - ✔✔inductor
✔✔What are the three types of inductors? - ✔✔Air core, iron core, and variable.
