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# Mechanical Engineering Interview Questions

##### Practice for Mechanical Engineering interviews by solving TestDome questions. Our interview questions are used by more than 7,000 companies and 450,000 individual test takers.

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Need to practice your mechanical engineering skills for an upcoming job interview? Try solving these mechanical engineering interview questions that test knowledge of concepts, principles, and best practices in various engineering branches such as mechanics, thermodynamics, material science, and electricity. We’ll provide feedback on your answers, and you can use a hint if you get stuck.

These mechanical engineering interview questions are examples of real tasks used by employers to screen mechanical engineers, maintenance engineers, industrial engineers, and others that require knowledge of engineering and mathematics principles and best practices.

## 1. Gasoline Engine

Gasoline Engine Thermal Efficiency Thermodynamics

Easy

The research and development department is looking for ways to improve engine efficiency for a gasoline engine that they'll use in a car.

Which changes would increase engine efficiency for the gasoline engine?

Use gasoline with a higher octane value.
Use the engine at the lowest possible RPM point.
Use the engine at the highest possible RPM point.
Increase the compression ratio.
Inject more fuel than needed to burn all available oxygen.

## 2. Temperature Alarm

Bimetal Materials Properties

Easy

A company is developing a temperature alarm, based on the schema below, that should close an electric circuit when the temperature rises above 150°C:

Linear coefficient of thermal expansion (x10-6K-1) Volumetric mass density (kg/m3) Melting point (°C)
Brass 13 8600 1000
Copper 17 8940 1100
Iron 11.8 7870 1500
Mercury 181 13540 -39
Polystyrene 70 1060 100
Steel 12 7800 1600

Based on available materials and their properties, choose materials for the temperature alarm that require the smallest temperature difference to do the task.

For Material 1:

For Material 2:

## 3. Light Bulbs

Electric Circuits Electricity

Easy

Three light bulbs are connected to a motorcycle's battery as shown in the image below:

How much energy does the 3rd bulb consume when all three bulbs are turned on?

W

If you feel ready, take one of our timed public Mechanical Engineering Interview Questions tests:

Mechanical Engineering Test (Easy)

Mechanical Engineering and Math Test (Easy)

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