Starter Motor Week 1 Day 1

Using a small-diameter pinion gear, the starter motor rotates the engine through a _________ attached to the flywheel.

• Ring gear

• Solenoid

• Relay

• Crankshaft

During the cranking process, the pinion of the starter motor engages with the ___________.

• Accessory drive system

• Crankshaft

• Flywheel ring gear

• Engine

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?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

What is the electric motor classification where the field and armature windings are connected in parallel?

• Series

• Compound

• Stepper

• Shunt

Which of the following statements is true about DC shunt or parallel wound motors?

• These motors develop less torque but maintain a constant speed.

• Field and armature windings have both series and parallel connections.

• These motors have good starting torque and stable operating speed.

• These motors are commonly used in wipers and power seats.

Which of the following statements is NOT true about DC series motors?

• Field and armature windings are connected in series.

• Series motors develop the highest torque.

• Series motors are used as starting motors.

• Armature coils are energized by microcontroller logic circuits.

In series motors, the current flows through the __________, and then to the __________, before leaving through the __________.

• armature, field windings, brushes
• brushes, field windings, armature
• stator, rotor, commutator
• field windings, armature, brushes

When battery voltage is low, the starter uses __________ amperage to rotate.

• More

• Less

• Zero

• The same

________ torque is produced at low speed because the motor draws the highest amperage.

• Constant

• Zero

• Lowest

• Greatest

What are the three main components, typically, of an armature?

• Shaft, brushes, and commutator

• Shaft, windings, and commutator

• Battery, switch, and controller

• Brushes, pole shoe, and windings