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

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

Which of the following statements is incorrect about the one-way clutch in pinion gears?

• It operates like a ratchet to protect the starter motor.

• It drives when turned in one direction.

• It slips when turned in the opposite direction.

• It shifts gears in electronically controlled transmissions.

Motor effect can be defined as:

• The starter motor causing the engine flywheel and crankshaft to rotate from a resting position

• The force of magnetic repulsion and attraction used to rotate an armature

• The starter motor rotating the engine through a ring gear attached to the flywheel

• The motor armature directly engaging the flywheel through a pinion gear

Technician A says that starter relays are a type of continuous-duty relay. Technician B says that starter relays are intended for continuous operation. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B