Types of Powerplants in Unmanned Aircraft

Which of the following is NOT a type of powerplant used in unmanned aircraft?

• Jets (turbines)

• Four-stroke engines

• Rotary engines

• Steam engines

What factors affect the type of powerplant used in unmanned aircraft?

• Color and design

• Weight and size restrictions

• Brand and manufacturer

• Pilot's preference

Mission requirements for unmanned aircraft powerplants include which of the following?

• Payload, duration, distance

• Color, design, brand

• Pilot's preference, color, design

• Manufacturer, brand, color

What type of motors do most small UAS (those weighing less than 55 pounds) use?

• Combustion engines

• Electric motors

• Hydraulic motors

• Pneumatic motors

Compared to combustion engines, electric motors typically have:

• More moving parts

• Heavier weight

• Easier maintenance

• Greater range

Which of the following is NOT a typical characteristic of electric motors compared to combustion engines?

• Fewer moving parts

• Lighter weight

• Greater endurance

• Easier to maintain

Why might sUAS manufacturers be willing to sacrifice range and endurance for simplicity and low weight?

• To reduce costs

• To increase speed

• To improve maneuverability

• To enhance durability

What type of current powers electric motors for sUAS?

• Alternating current (AC)

• Direct current (DC)

• Pulsating current (PC)

• Static current (SC)

What happens when the amount of current in an electric motor for sUAS is varied?

• The voltage changes

• The frequency changes

• The RPM changes

• The resistance changes

Which component of an electric motor remains stationary?

• Rotor

• Stator

• Commutator

• Armature