MECP PRACTICE EXAM 2026 EXAM
QUESTIONS AND ANSWERS
To find voltage drops on Amplifier grounds, what setting should be used on the
DMM while loading down and testing between the amplifier ground and the
vehicles chassis ground point? - Correct Answer -DC volts
If an insufficient ground in an amplifier and is measured under load (i.e. While
typical current is flowing), it will show a difference of potential between which
points listed? - Correct Answer -Between the (-) negative battery post and the (-)
negative input of the amplifier
Kirchhoff's Voltage Law (KVL) states which one of the following? - Correct
Answer -The voltage applied to a DC series circuit must equal the sum of the
voltage drops within the circuit .
Inductors used in aftermarket mobile audio systems perform which one of the
functions listed as their primary purpose? - Correct Answer -Oppose a change in
current flow
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,When wiring multiple relays to trigger from a single low current output, how many
80 ohm coil relays can safely be connected at 12 volts if that output that supplies
500mA current? - Correct Answer -3
Resistors used in aftermarket mobile audio systems perform which one of the
functions listed their primary purpose? - Correct Answer -Oppose current flow.
What electrical unit expresses difference of potential in an electrical circuit? -
Correct Answer -Volts
As car batteries age, their internal impedance drops. - Correct Answer -False
A resistor with a value of 6.6K Ohm is an abbreviation for which value? - Correct
Answer -6600 Ohms
How much electrical power consumption results from measured values of 14 volts
and 8 amps? - Correct Answer -112 Watts
What type of electronic component has emitter, collector, and base terminals? -
Correct Answer -NPN Transistor
AC ripple in a healthy automotive alternator is highest at idle (roughly 800 to 1000
RPM). - Correct Answer -False
What is the measured voltage on two 12v batteries connected in parallel as
pictured? - Correct Answer -12volts
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, If a diode is operating normally in a forward biased condition....? - Correct Answer
-Positive current on the anode flows to the cathode
An inductance value of 1 Henry is equal to how many milliHenries (mH)? -
Correct Answer -1000 mH
An inductance value of 1 Henry is equal to how many milliHenries (mH)? -
Correct Answer -1000 millihenry
Which two terminals shown in the diagram of an SPDT automotive relay are the
coil terminals? - Correct Answer -A and E
Which two terminals shown in the diagram are the Normally Open and Common
terminals of an SPDT automotive relay? - Correct Answer -B and D
Rectification of AC in a standard automotive alternator involves how many phases
of AC? - Correct Answer -3 phases
What is the name for the side of a silicone diode with the line on it? - Correct
Answer -Cathode
How is a fuse connected in an automotive D.C. electrical circuit? - Correct Answer
-In series between the voltage source and the load
©COPYRIGHT 2025 ALL RIGHTS RESERVED 3
QUESTIONS AND ANSWERS
To find voltage drops on Amplifier grounds, what setting should be used on the
DMM while loading down and testing between the amplifier ground and the
vehicles chassis ground point? - Correct Answer -DC volts
If an insufficient ground in an amplifier and is measured under load (i.e. While
typical current is flowing), it will show a difference of potential between which
points listed? - Correct Answer -Between the (-) negative battery post and the (-)
negative input of the amplifier
Kirchhoff's Voltage Law (KVL) states which one of the following? - Correct
Answer -The voltage applied to a DC series circuit must equal the sum of the
voltage drops within the circuit .
Inductors used in aftermarket mobile audio systems perform which one of the
functions listed as their primary purpose? - Correct Answer -Oppose a change in
current flow
©COPYRIGHT 2025 ALL RIGHTS RESERVED 1
,When wiring multiple relays to trigger from a single low current output, how many
80 ohm coil relays can safely be connected at 12 volts if that output that supplies
500mA current? - Correct Answer -3
Resistors used in aftermarket mobile audio systems perform which one of the
functions listed their primary purpose? - Correct Answer -Oppose current flow.
What electrical unit expresses difference of potential in an electrical circuit? -
Correct Answer -Volts
As car batteries age, their internal impedance drops. - Correct Answer -False
A resistor with a value of 6.6K Ohm is an abbreviation for which value? - Correct
Answer -6600 Ohms
How much electrical power consumption results from measured values of 14 volts
and 8 amps? - Correct Answer -112 Watts
What type of electronic component has emitter, collector, and base terminals? -
Correct Answer -NPN Transistor
AC ripple in a healthy automotive alternator is highest at idle (roughly 800 to 1000
RPM). - Correct Answer -False
What is the measured voltage on two 12v batteries connected in parallel as
pictured? - Correct Answer -12volts
©COPYRIGHT 2025 ALL RIGHTS RESERVED 2
, If a diode is operating normally in a forward biased condition....? - Correct Answer
-Positive current on the anode flows to the cathode
An inductance value of 1 Henry is equal to how many milliHenries (mH)? -
Correct Answer -1000 mH
An inductance value of 1 Henry is equal to how many milliHenries (mH)? -
Correct Answer -1000 millihenry
Which two terminals shown in the diagram of an SPDT automotive relay are the
coil terminals? - Correct Answer -A and E
Which two terminals shown in the diagram are the Normally Open and Common
terminals of an SPDT automotive relay? - Correct Answer -B and D
Rectification of AC in a standard automotive alternator involves how many phases
of AC? - Correct Answer -3 phases
What is the name for the side of a silicone diode with the line on it? - Correct
Answer -Cathode
How is a fuse connected in an automotive D.C. electrical circuit? - Correct Answer
-In series between the voltage source and the load
©COPYRIGHT 2025 ALL RIGHTS RESERVED 3
