End Of 9 Weeks Study Guide (Spring)

Front

What is the primary principle behind how an electric motor operates?

Back

Electromagnetic induction

Answer explanation

An electric motor operates primarily on the principle of electromagnetic induction, where electric current generates a magnetic field that interacts with magnets, producing motion.

Front

Which of the following is NOT a component of an electric motor? Stator, Rotor, Capacitor, Commutator

Back

Capacitor

Answer explanation

A capacitor is not a component of an electric motor. The main components are the stator, rotor, and commutator, which work together to convert electrical energy into mechanical energy.

Front

Which type of motor is typically used in household appliances?

Back

AC Motor

Answer explanation

AC motors are commonly used in household appliances due to their efficiency and ability to run on standard household electricity. They provide reliable performance for devices like fans, refrigerators, and washing machines.

Front

If the voltage applied to an electric motor is doubled, what is the expected effect on the speed of the motor?

Back

Speed doubles

Answer explanation

Doubling the voltage applied to an electric motor typically results in a doubling of the speed, assuming other factors remain constant. Therefore, the correct answer is that the speed doubles.

Front

In a series circuit, if one component fails, what happens to the circuit?

Back

The entire circuit stops working

Answer explanation

In a series circuit, all components are connected in a single path. If one component fails, it breaks the circuit, causing the entire circuit to stop working. Therefore, the correct answer is that the entire circuit stops working.

Front

What is the main purpose of a circuit breaker?

Back

To protect the circuit from overload

Answer explanation

The main purpose of a circuit breaker is to protect the circuit from overload. It automatically interrupts the flow of electricity when it detects excessive current, preventing damage to the circuit and connected devices.

Front

Which of the following is NOT a step in the Engineering Design Process? A) Define the problem, B) Create a prototype, C) Test the solution, D) Calculate the profit

Back

Calculate the profit

Answer explanation

Calculating profit is not a step in the Engineering Design Process. The process focuses on defining problems, creating prototypes, and testing solutions, while profit calculation is a business consideration.

Front

Why is prototyping important in engineering design?

Back

It helps visualize ideas.

Answer explanation

Prototyping is crucial in engineering design as it helps visualize ideas, allowing designers to explore concepts and make adjustments before finalizing a product. This enhances creativity and reduces the risk of costly mistakes.

Front

Feedback in the engineering design process is used to:

Back

Improve future designs

Answer explanation

Feedback in the engineering design process is essential for identifying areas of improvement, which helps to enhance future designs. It does not confirm perfection, increase costs, or reduce collaboration.

Front

Which of the following is an example of an improvement in an electric motor's efficiency? Options: Using larger wires, Reducing friction in moving parts, Increasing the size of the motor, Using a higher voltage

Back

Reducing friction in moving parts

Answer explanation

Reducing friction in moving parts minimizes energy loss, directly improving the motor's efficiency. Other options may not effectively enhance efficiency or could even lead to increased energy consumption.