WorksheetsDSL-206 Electrical 2 Mid-term
Total questions: 30
Worksheet time: 16mins
Using a small-diameter pinion gear, the starter motor rotates the engine through a __________ attached to the flywheel
a. Ring gear
b. Relay
c. Solenoid
d. Crankshaft
Technician A says that the ratio between the flywheel ring gear and pinion gear is anywhere between 10:1 and 15:1 in gasoline engines.
Technician B says that the higher cranking torque required for diesel engines uses 15:1 to 22:1, with 18:1 being the most common. Who is
correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Which of the following is NOT correct concerning overhauling a starter motor?
a. Use a 24-volt test lamp to test field windings.
b. The starter motor component parts should also be cleaned and replaced or repaired and lubricated as necessary.
c. Check drive clutch for slippage
d. Perform a full load test.
What is the electric motor classification where the field and armature windings are connected in parallel?
a. Series
b. Compound
c. Stepper
d. Shunt
In series motors, the current flows through the __________, and then to the __________, before leaving through the __________.
a. Negative chassis, brush, armature windings
b. Armature windings, field windings, motor terminal
c. Field coils, armature windings, positive battery
d. Field windings, armature windings, motor terminal
When battery voltage is low, the starter uses __________ amperage to rotate.
a. More
b. Less
c. Zero
d. The same
__________ torque is produced at low speed because the motor draws the highest amperage.
a. Constant
b. Zero
c. Lowest
d. Greatest
What are the three main components, typically, of an armature?
a. Shaft, brushes, and commutator
b. Shaft, windings, and commutator
c. Battery, switch, and controller
d. Brushes, pole shoe, and windings
Which of the following statements is incorrect about the one-way clutch in pinion gears?
a. It operates like a ratchet to protect the starter motor.
b. It drives when turned in one direction.
c. It slips when turned in the opposite direction.
d. It shifts gears in electronically controlled transmissions.
Motor effect can be defined as:
a. The starter motor causing the engine flywheel and crankshaft to rotate from a resting position
b. The force of magnetic repulsion and attraction used to rotate an armature
c. The starter motor rotating the engine through a ring gear attached to the flywheel
d. The motor armature directly engaging the flywheel through a pinion gear
Old batteries with high resistance require the alternator to work _____ to charge them.
more efficiently
less
harder
less efficiently
When investigating electrical fires often caused by grounded alternator cables you must examine _____
The burned alternator
The severely burned wiring
The broken belts
Battery Cables
Alternators have always been used on commercial vehicles.
True
False
Alternators can produce power at engine idle speeds; (a) cannot.
Output polarity from generators _____ depending on the _____ of rotation.
increases / speed
decreases / direction
is limited / shaft
changes / direction
Oil cooled alternators drain oil from internal parts back into the _____
Crankcase
Oil cooler
Oil filter
Radiator
Exposure of crankcase oil vapors to alternator conductors carrying high amperage current, it has the potential to create _____ if an alternator is defective
Less voltage
Poor quality voltage
Small engine explosion
sparks
Voltage is induced in each coil, producing current flow from the rotation of a _____
Stator
Magnet
Copper windings
alternator shaft
The highest induced voltage takes place when the magnetic field and conductors are at _____
180 degrees
120 degrees
360 degrees
90 degrees
Two most important part in an alternator used to produce electrical current are the _____ and _____
cooling fan / support bearing
rotor / stator windings
coil / slip rings
rotor claw / diode
Technician A says that parallel wiring is a type of custom-made wiring harness that encloses multiple conductors into a single vinyl insulator covering. Technician B says that parallel wiring is often used for rear taillight wiring in trucks, buses, and trailer harnesses. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
Technician A says that in most wiring diagrams, metric-sized wire is specified in centimeters. Technician B says that as the diameter of the wire
increases in the metric gauge standard, the gauge also increases. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
A conductor 100 ft long with 0.5 ohms of resistance required to carry 10 amps of current in a 12-volt circuit sees a voltage drop of __________.
a. 12 volts
b. 7 volts
c. 6 volts
d. 5 volts
Why is multi-stranded wire better at conducting higher amounts of current with less resistance?
a. Because it has an adhesive layer between the tubing and wire.
b. Because it encloses multiple conductors into a single vinyl insulator covering.
c. Because it has more surface area to conduct electron flow.
d. Because current tracks that contain electrical components and conductors are situated between power and ground.
__________ wires become more resistant and heat up as amperage increases.
a. Smaller
b. Larger
c. Thicker
d. Thinner
What are the two main types of terminals used in harness connectors?
a. Male and female
b. Weather Pack and Metri-Pack
c. Pull-to-seat and push-to-seat
d. Bosch and Deutsch
Technician A says that pull-to-seat terminals are installed by inserting the wire through the connector cavity, crimping on a terminal, and then pulling
the terminal back into the connector cavity. Technician B says that push-to-seat terminals are inserted into the back of the connector cavity after the
terminal is crimped to the wire. Who is correct?
a. Technician A
b. Technician B
c. Both Technician A and Technician B
d. Neither Technician A nor Technician B
__________ is used for terminal applications demanding high-reliability conducting with low-resistance and high-frequency electrical signals
a. Copper
b. Gold
c. Silver
d. Tin
What role does a latch or a lock play in a connector?
a. Surrounds and protects the terminal area
b. Prevents intrusion of dirt into the terminal area
c. Prevents the connector from separating
d. Provides resistance to failures caused by vibration and heating
Which one of the following is not advisable to increase wiring longevity?
a. Cover wiring and harness in a protective loom
b. Route wiring away from heat sources and moving parts
c. Secure wire with clips and plastic ties
d. Occasionally rinse with water
