Try yourself right away: Top 10 Diesel Mechanics Interview Question & Answers

Find out how confident you are. Try to pass our small blitz survey to test your knowledge. Even if you consider yourself an experienced specialist, do not rush to write your stunning mechanic cover letter. After all, you will need it only after you correctly answer all the questions of our small test. Check yourself, because sometimes the simplest things can be the most difficult.

Behold these Top 10  the most vital diesel interview question which has been asked during interview session. Here we share the most common type of question with answer for interview session to enrich your knowledge.

Question Number 1: What Is Analog Sensor?

Answer:  A sensor which sends a range of voltages in DC to the ECM to describe, for example, coolant temperature, engine oil pressure, or atmospheric pressure.

Question Number 2: What Is Automatic Valve?

Answer: A valve assisted by a spring, which is opened by a difference of pressure acting in one direction and closed by a difference in pressure acting in the opposite direction.

Question Number 3: What Is Brake Thermal Efficiency?

Answer: Ratio of power output in the form of brake horsepower to equivalent power input in the form of heat from fuel. Typical brake thermal efficiency ranges from thirty to forty-two percent.

Question Number 4: What Is Cam?

Answer: A rotating component of irregular shape. It is used to change the direction of the motion of another part moving against it, e.g., rotary into reciprocating or variable motion.

Question Number 5: What Is Relay?

Answer: Normally used in control circuits, relay is a switch driven by electricity and rules over contactor by virtue of low amperage contacts.

Question Number 6: What Is Chamfer (taper Lead)?

Answer: The taper at the thread end of a tap or the throat of a die, made by cutting away the crests of the first few threads. This distributes the work of cutting over several threads and acts as a guide in starting the tap or die. The chamfer is relieved to facilitate cutting.

Question Number 7: What Is Displacement?

Answer: In a single acting engine, the volume swept by all pistons in making one strokes each. The displacement on one cylinder in cubic inches is the circular area (in square inches) times the stroke (in inches).

Question Number 8: What Is Brake Mean Effective Pressure (bmep)?

Answer: Mean effective pressure acting on the piston which would result in the given brake horsepower output, if there were no losses due to friction, cooling, and exhaustion. Equal to mean indicated pressure times mechanical efficiency.

Question Number 9: What Is Digital Sensor?

Answer: A sensor which uses duty cycles of two voltages in timed pulses of AC to relay such information as speed, throttle position, and engine timing.

Question Number 10: What Is Diesel Engine?

Answer: An internal combustion engine in which fuel oil is burnt by heat produced from air compression. The most commonly bought Industrial Diesel Engines are either Rebuilt Diesel Engine or Used Diesel Engine.

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And send us your resume, preferably with a cover letter in which you tell us, why it is you, who should become a part of our team. We look forward to greet you in our team!


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  2. Great content! Super high-quality! Keep it up! 🙂

  3. Hi, very nice website, cheers!

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