DC Electrics - DC Motors Quiz

What is the primary function of an electric motor?

• To store electrical energy

• To generate electrical energy

• To convert electrical energy into mechanical energy

• To convert mechanical energy into electrical energy

According to Fleming’s Left Hand Rule, which finger represents the direction of the magnetic field?

• Thumb

• First finger

• Palm

• Second finger

What does back EMF oppose in a DC motor?

• Mechanical load

• Current flow

• Magnetic field

• Supply voltage

What is the purpose of a slow start resistor in a motor circuit?

• To maintain constant speed

• To reduce initial starting current

• To prevent overheating

• To increase the speed of the motor

In a series wound motor, what happens when the load increases?

• The motor speeds up

• The back EMF increases

• The armature current decreases

• The field strength varies with armature current

What type of motor is designed to maintain a constant speed under varying loads?

• Induction motor

• Shunt wound motor

• Series wound motor

• Universal motor

What is the main advantage of a starter-generator system in aircraft?

• It is lighter than using separate devices

• It requires more maintenance

• It can operate at low RPM

• It is more complex

What type of actuator is used to control hydraulic and pneumatic systems?

• Linear actuators

• Rotary actuators

• Solenoid actuators

• Motor actuators

What is the primary function of a rotary actuator?

• To provide linear motion

• To control hydraulic systems

• To generate electrical energy

• To rotate an output shaft

What is the role of limit switches in actuators?

• To increase speed

• To provide power

• To reduce current

• To control travel extent and direction