AC/DC SACA Final Exam Study Guide
Test.
How many degrees apart are the phases of a balanced three phase system? - CORRECT ANSWER 120
What does an electrical schematic not show? - CORRECT ANSWER Physical connections
Resistance is measured in units of? - CORRECT ANSWER Ohms
What is the power formula? - CORRECT ANSWER P=IxE
What is power measured in? - CORRECT ANSWER Watts
What is the function of an inductor? - CORRECT ANSWER It opposes a change in current flow
A coil is a_________? - CORRECT ANSWER Output
Which of the following is an output? - CORRECT ANSWER Solenoid
What is the formula to solve for current? - CORRECT ANSWER I=E/R
When troubleshooting a circuit, what can be said if the total resistance of the parallel circuit does not
change when a branch is removed? - CORRECT ANSWER An open exists in the removed branch
The unit for electromotive force (emf) is? - CORRECT ANSWER Volt
What is the relationship of the applied voltage across two electrical components in parallel with each
other? - CORRECT ANSWER They are the same
, Which feature of a ground circuit creates a safe path for current? - CORRECT ANSWER Low resistance to
earth
An ohmmeter is reading total circuit resistance reads 0 ohms when all branches are connected and
reads 200 ohms when a branch is disconnected. What condition exists? - CORRECT ANSWER There is a
short in the disconnected branch
A series circuit has a total of three resistors, 5 ohms, 3 ohms, and 16 ohms. What is the Rt of this circuit?
- CORRECT ANSWER 24 ohms
When testing an indicator light, one must first remove it from the circuit and place a multimeter across
its threaded area and base or input leads. What is the next step in testing the indicator light? - CORRECT
ANSWER Set the meter for resistance and check the reading
What is the secondary coil voltage of a transformer that has 120v supplied, 400 turns on the primary
and 100 turns on the secondary? - CORRECT ANSWER 30v
A voltmeter is connected in a circuit by? - CORRECT ANSWER Placing the test leads in parallel with the
circuit device
To measure current in a current, how is the meter placed in the circuit? - CORRECT ANSWER In series
with the circuit or component
Which of the following is the formula for TR - CORRECT ANSWER TR=NP/NS
Which of the following is an immediate danger of unsecured electrical cords? - CORRECT ANSWER Trip
hazard
A series circuit has three resistors. The voltage measured across each resistor is 4vdc, 8vdc, and 12vdc.
What is the Et of this circuit? - CORRECT ANSWER 24
When checking for voltage in a circuit, the test leads of the multimeter must be placed in______with the
circuit? - CORRECT ANSWER Parallel
Test.
How many degrees apart are the phases of a balanced three phase system? - CORRECT ANSWER 120
What does an electrical schematic not show? - CORRECT ANSWER Physical connections
Resistance is measured in units of? - CORRECT ANSWER Ohms
What is the power formula? - CORRECT ANSWER P=IxE
What is power measured in? - CORRECT ANSWER Watts
What is the function of an inductor? - CORRECT ANSWER It opposes a change in current flow
A coil is a_________? - CORRECT ANSWER Output
Which of the following is an output? - CORRECT ANSWER Solenoid
What is the formula to solve for current? - CORRECT ANSWER I=E/R
When troubleshooting a circuit, what can be said if the total resistance of the parallel circuit does not
change when a branch is removed? - CORRECT ANSWER An open exists in the removed branch
The unit for electromotive force (emf) is? - CORRECT ANSWER Volt
What is the relationship of the applied voltage across two electrical components in parallel with each
other? - CORRECT ANSWER They are the same
, Which feature of a ground circuit creates a safe path for current? - CORRECT ANSWER Low resistance to
earth
An ohmmeter is reading total circuit resistance reads 0 ohms when all branches are connected and
reads 200 ohms when a branch is disconnected. What condition exists? - CORRECT ANSWER There is a
short in the disconnected branch
A series circuit has a total of three resistors, 5 ohms, 3 ohms, and 16 ohms. What is the Rt of this circuit?
- CORRECT ANSWER 24 ohms
When testing an indicator light, one must first remove it from the circuit and place a multimeter across
its threaded area and base or input leads. What is the next step in testing the indicator light? - CORRECT
ANSWER Set the meter for resistance and check the reading
What is the secondary coil voltage of a transformer that has 120v supplied, 400 turns on the primary
and 100 turns on the secondary? - CORRECT ANSWER 30v
A voltmeter is connected in a circuit by? - CORRECT ANSWER Placing the test leads in parallel with the
circuit device
To measure current in a current, how is the meter placed in the circuit? - CORRECT ANSWER In series
with the circuit or component
Which of the following is the formula for TR - CORRECT ANSWER TR=NP/NS
Which of the following is an immediate danger of unsecured electrical cords? - CORRECT ANSWER Trip
hazard
A series circuit has three resistors. The voltage measured across each resistor is 4vdc, 8vdc, and 12vdc.
What is the Et of this circuit? - CORRECT ANSWER 24
When checking for voltage in a circuit, the test leads of the multimeter must be placed in______with the
circuit? - CORRECT ANSWER Parallel
