ATT 93 comp study guide
what section of a power supply unit maintains a constant output
voltage? - ✔ ✔ the regulator
current flowing through a relays contacts in one direction can only
cause what failure? - ✔ ✔ coned and cratered contacts
you clean relay contacts with what tool? - ✔ ✔ a burnishing tool
how do you fix a sealed relay? - ✔ ✔ replace the entire relay
what is the effect of an open component? - ✔ ✔ prevent current
flow
what is the effect of a shorted component? - ✔ ✔ eliminates the
component from the circuit
which step of the four step troubleshooting procedure is a fault
repaired? - ✔ ✔ step four
what step of the four step troubleshooting procedure is operation
found? - ✔ ✔ step one
when is a possible fault found? - ✔ ✔ step 3
which internal IC can produce signals that show three different volt
levels? - ✔ ✔ short between pins other than VCC and ground
what are three steps for repairing digital systems? - ✔ ✔ fault
detection, isolation, and correction
, IC an internal malfunctions make.... - ✔ ✔ it's operation
unpredictable
three most common faults in ICs are.... - ✔ ✔ opens, shorts, and
faulty power supply units
what component changes color to indicate an element change is
needed in dry air systems? - ✔ ✔ Telltale oil filters
what type of cooling is used in sealed enclosures? - ✔ ✔ air-to-air
what cooling system uses chilled water for both standby and normal
operation? - ✔ ✔ type 3
current is measured in an open circuit when the meter leads are
placed...... - ✔ ✔ across the open
components with no voltage drop are...... - ✔ ✔ short
they shorted component wire will measure...... - ✔ ✔ minimum
resistance
What fault provides no resistance to current flow? - ✔ ✔ a short
what causes resistance to go up or down? - ✔ ✔ changed value
what causes current to stop? - ✔ ✔ an open
how many cycles per second is 60 hertz - ✔ ✔ 60
what is the formula for finding a period of a wavelength? - ✔ ✔ T=
1÷f
what is the. Of a 20 Hertz sine wave? - ✔ ✔ 0.05 seconds
what section of a power supply unit maintains a constant output
voltage? - ✔ ✔ the regulator
current flowing through a relays contacts in one direction can only
cause what failure? - ✔ ✔ coned and cratered contacts
you clean relay contacts with what tool? - ✔ ✔ a burnishing tool
how do you fix a sealed relay? - ✔ ✔ replace the entire relay
what is the effect of an open component? - ✔ ✔ prevent current
flow
what is the effect of a shorted component? - ✔ ✔ eliminates the
component from the circuit
which step of the four step troubleshooting procedure is a fault
repaired? - ✔ ✔ step four
what step of the four step troubleshooting procedure is operation
found? - ✔ ✔ step one
when is a possible fault found? - ✔ ✔ step 3
which internal IC can produce signals that show three different volt
levels? - ✔ ✔ short between pins other than VCC and ground
what are three steps for repairing digital systems? - ✔ ✔ fault
detection, isolation, and correction
, IC an internal malfunctions make.... - ✔ ✔ it's operation
unpredictable
three most common faults in ICs are.... - ✔ ✔ opens, shorts, and
faulty power supply units
what component changes color to indicate an element change is
needed in dry air systems? - ✔ ✔ Telltale oil filters
what type of cooling is used in sealed enclosures? - ✔ ✔ air-to-air
what cooling system uses chilled water for both standby and normal
operation? - ✔ ✔ type 3
current is measured in an open circuit when the meter leads are
placed...... - ✔ ✔ across the open
components with no voltage drop are...... - ✔ ✔ short
they shorted component wire will measure...... - ✔ ✔ minimum
resistance
What fault provides no resistance to current flow? - ✔ ✔ a short
what causes resistance to go up or down? - ✔ ✔ changed value
what causes current to stop? - ✔ ✔ an open
how many cycles per second is 60 hertz - ✔ ✔ 60
what is the formula for finding a period of a wavelength? - ✔ ✔ T=
1÷f
what is the. Of a 20 Hertz sine wave? - ✔ ✔ 0.05 seconds
