Free DCT Electrical & Electronic Diagnostics Questions and Answers

Question 1

What tool is commonly used to measure voltage in a diesel electrical system?

Accepted Answer

Multimeter

Answer

Torque wrench

Answer

Feeler gauge

Answer

Timing light

Question 2

Which component charges the battery in a diesel vehicle?

Accepted Answer

Alternator

Answer

Starter motor

Answer

Ignition coil

Answer

Glow plug

Question 3

What does high resistance in a wire typically cause?

Accepted Answer

Voltage drop

Answer

Increased fuel pressure

Answer

Lower engine compression

Answer

High coolant temperature

Question 4

Which system controls engine timing and fuel injection in modern diesel engines?

Accepted Answer

Engine control module

Answer

Air conditioning control unit

Answer

Transmission control module

Answer

Brake control system

Question 5

What does a blown fuse indicate in an electrical circuit?

Accepted Answer

Circuit overload or short

Answer

Low battery charge

Answer

Worn brake pads

Answer

Fuel leak

Question 6

Which sensor monitors oxygen levels in diesel exhaust?

Accepted Answer

Oxygen sensor

Answer

Knock sensor

Answer

Throttle position sensor

Answer

Fuel pressure sensor

Question 7

What does a wiring diagram help a technician do?

Accepted Answer

Find electrical connections

Answer

Measure fuel economy

Answer

Test compression

Answer

Adjust tire pressure

Question 8

Which electrical component stores energy and helps stabilize voltage?

Accepted Answer

Capacitor

Answer

Resistor

Answer

Ignition switch

Answer

Solenoid

Question 9

What unit is used to measure electrical resistance?

Accepted Answer

Ohms

Answer

Volts

Answer

Watts

Answer

Amperes