955 LATEST 2026 EXAM TEST PAPER QUESTIONS AND
ANSWERS MARKED A+
✔✔The step down transformer outside a house does what? - ✔✔Reduces the voltage
to a usable voltage for the house ELECTRIC, which are usually TWO 120VAC legs.
✔✔What is an electronic shunt? - ✔✔A device which allows electric current to pass
around a point in a circuit. A shunt as CIRCUIT PROTECTION: is a device that is
commonly called a CROWBAR circuit and is used when a circuit must be protected
from over VOLTAGE.
✔✔What does a capacitor do? - ✔✔When used as a shunt, redirects hight frequency
nouse to ground before it can transmit to the load or other circuit components. This is
why they are used so frequently in DC power supplies as AC filters.
✔✔What is a Zenner Diode? - ✔✔Voltage Regulator used when devices are sensitive to
reverse polarity in a signal to protect a circuit. Also used in a power supply to cause a
fuse or other current limiting circuit to open.
✔✔How does a shunt used as Circuit Protection work? - ✔✔When a shunt detects an
over VOLTAGE it causes a short circuit between the power supply and its return lilne,
which produces an immediate drop in voltage and a resultant HIGH CURRENT which
opens the CURRENT SENSITIVE DEVICE in the circuit usall a FUSE or CIRCUIT
BREAKER.
✔✔What is ESD? - ✔✔ELECTROSTATIC DISCHARGE: a brief an abrupt electric
current that flows between two objects at DIFFERENT ELECTRICAL POTENTIALS
which is caused by CONTACT, or INDUCED by AN ELECTROSTATIC field.
✔✔What is a RESISTOR? - ✔✔Electronical device that RESISTS the FLOW of
ELECTRICAL CURRENT.
✔✔Symbol for: ZENNER DIODE - ✔✔x
✔✔Definition of Zener Diode: - ✔✔Voltage Regulator, typically REVERSED BIASED.
If reverse voltage of a circuit is INCREASED the zener begins to LEAK current until the
breakdown voltage is where the current INCREASES DRAMATICALLY. Zener diode
will CONDUCT to keep the voltage REGULATED.
✔✔What is LED - ✔✔Light Emitting Diode emits different colors and are made of
different semi-conductor materials, and require different energies to light them. The
FLAT side of the LED is the NEGATIVE terminal and the LONGER LEG is the
POSITIVE lead.
ANSWERS MARKED A+
✔✔The step down transformer outside a house does what? - ✔✔Reduces the voltage
to a usable voltage for the house ELECTRIC, which are usually TWO 120VAC legs.
✔✔What is an electronic shunt? - ✔✔A device which allows electric current to pass
around a point in a circuit. A shunt as CIRCUIT PROTECTION: is a device that is
commonly called a CROWBAR circuit and is used when a circuit must be protected
from over VOLTAGE.
✔✔What does a capacitor do? - ✔✔When used as a shunt, redirects hight frequency
nouse to ground before it can transmit to the load or other circuit components. This is
why they are used so frequently in DC power supplies as AC filters.
✔✔What is a Zenner Diode? - ✔✔Voltage Regulator used when devices are sensitive to
reverse polarity in a signal to protect a circuit. Also used in a power supply to cause a
fuse or other current limiting circuit to open.
✔✔How does a shunt used as Circuit Protection work? - ✔✔When a shunt detects an
over VOLTAGE it causes a short circuit between the power supply and its return lilne,
which produces an immediate drop in voltage and a resultant HIGH CURRENT which
opens the CURRENT SENSITIVE DEVICE in the circuit usall a FUSE or CIRCUIT
BREAKER.
✔✔What is ESD? - ✔✔ELECTROSTATIC DISCHARGE: a brief an abrupt electric
current that flows between two objects at DIFFERENT ELECTRICAL POTENTIALS
which is caused by CONTACT, or INDUCED by AN ELECTROSTATIC field.
✔✔What is a RESISTOR? - ✔✔Electronical device that RESISTS the FLOW of
ELECTRICAL CURRENT.
✔✔Symbol for: ZENNER DIODE - ✔✔x
✔✔Definition of Zener Diode: - ✔✔Voltage Regulator, typically REVERSED BIASED.
If reverse voltage of a circuit is INCREASED the zener begins to LEAK current until the
breakdown voltage is where the current INCREASES DRAMATICALLY. Zener diode
will CONDUCT to keep the voltage REGULATED.
✔✔What is LED - ✔✔Light Emitting Diode emits different colors and are made of
different semi-conductor materials, and require different energies to light them. The
FLAT side of the LED is the NEGATIVE terminal and the LONGER LEG is the
POSITIVE lead.
