Lithuania, the EU and other countries
Poland · Russia · China · India · United Kingdom
We first study Lithuania's rules and applicable EU rules. Europe is not only the EU: the route, national law and international agreements matter for each journey. Here we compare a few selected differences.
We choose sources for their relevance and reliability: they may come from Lithuania, Poland, other EU countries, the United Kingdom, Russia or elsewhere. A source's country alone does not determine which rules apply in Lithuania. The scope and sources for each comparison are provided alongside it.
What does an engine's brake thermal efficiency indicate?
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First try to answer in your own words.
Keyboard: space barAnswer
Brake thermal efficiency is the useful mechanical energy at the engine shaft divided by the energy consumed in the fuel. The higher it is, the greater the proportion of fuel energy used to do work.
Please note
A simple explanation
Brake thermal efficiency indicates what proportion of fuel energy is converted into useful mechanical work at the engine shaft. The remaining energy is lost as heat, in the exhaust gases and through friction. Quantities with the same dimensions must be compared: work with energy, or power with the rate of energy input.
Useful energy ÷ total energy consumed.
Sources and checks
Editorial review: 2026-09-28.
Learning objective: Explain what proportion of fuel energy is described by an engine's brake thermal efficiency. EU syllabus area: 1.1. The ratio of engine shaft power to the rate of fuel energy input has been checked; it is equivalent to the ratio of the energies over the same period.
Answer compared with sources: 2026-09-28.
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Question map
Understand the whole topic
Short explanations supplement the 300 questions. Choose a lesson, then return to the related questions and test your recall.
EU C / CE learning areas
The 300 questions are mapped to 14 freight transport learning areas in Annex I to Directive (EU) 2022/2561. Choose a specific skill and its related questions. Practice tasks help you prepare for work with an instructor.
Visual explanations
Five explanations help you understand motion, visibility, loads and vehicle checks. You can change values in the braking and axle-load examples.
Practical scenarios
Read the facts and decide what you would do. Then reveal the solution and compare your explanation. These are additional tasks alongside the 300 questions; no points are awarded.
Check your knowledge
Additional quiz questions are linked to the 300 study questions. After you answer, each option is explained, and at the end you will see results by topic.
Learning together and feedback
Try it together in 25–30 minutes
For an instructor and a small group: choose one C/CE freight transport topic in the Lithuania and EU context. Use your own devices, including a phone and a computer.
- 3 questions. In ‘Recall’ mode, first answer in your own words, then read the explanation and mark what needs more review.
- A lesson and a diagram. Discuss what they explain and which conditions matter.
- One scenario. Decide before revealing the solution. Explain the reasons for your chosen action.
- A few quiz questions. Read the explanation for each option. You can finish the quiz early; the remaining questions will be marked as unanswered.
- Discussion. Everyone names one useful point and one thing that needs correcting.
How can you share or suggest a correction?
You will find the question link and feedback field below this section. Lessons, diagrams and scenarios have their own ‘Copy link’ button. ‘Suggest a correction’ helps you prepare a note with the specific link and version label. Copy or download the text and pass it on for review.
Discuss: is it easy to find an answer and return to the question? Can you explain the reason and the limits of the rule's application? Which sentence is misleading? Flag any significant legal or safety uncertainty for checking before using the material.
Translated from the Lithuanian edition. The material concerns Lithuania and the EU; source-check dates refer to the Lithuanian answers.
Study materials for C/CE drivers: 300 questions with explanations, lessons, quizzes and practical scenarios. Based on Lithuania's and EU rules.