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Comau Interview Questions and Answers

Updated 5 Feb 2024

Q1. Which gas is used in gas arc welding?

Ans.

Argon gas is commonly used in gas arc welding.

  • Argon gas is the most commonly used gas in gas arc welding.

  • It is used as a shielding gas to protect the weld from atmospheric contamination.

  • Argon gas provides a stable arc and helps to prevent oxidation during the welding process.

  • Other gases like helium and carbon dioxide can also be used depending on the specific welding requirements.

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Q2. working of syncromesh gearbox?

Ans.

A synchromesh gearbox is a type of manual transmission that uses synchronizers to match the speed of the gears before engaging them.

  • Synchromesh gearbox uses synchronizers to match the speed of the gears before engaging them

  • Synchronizers are small collars that help to match the speed of the gears

  • Synchromesh gearbox allows for smoother and faster gear changes

  • Synchromesh gearbox is commonly used in modern cars

  • Synchromesh gearbox is more expensive than non-synchromesh gearbox

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Q3. To compare otto and diesel cycle

Ans.

Otto cycle is used in gasoline engines while diesel cycle is used in diesel engines.

  • Otto cycle has constant volume heat addition while diesel cycle has constant pressure heat addition.

  • Otto cycle has higher thermal efficiency than diesel cycle.

  • Diesel cycle has higher compression ratio than Otto cycle.

  • Diesel cycle has lower exhaust gas temperature than Otto cycle.

  • Diesel cycle has higher NOx emissions than Otto cycle.

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Q4. Design of multi speed gearbox?

Ans.

A multi speed gearbox is designed to provide different gear ratios for efficient power transfer at different speeds.

  • The gearbox should have multiple gear ratios to match the engine's power output with the vehicle's speed.

  • The gear ratios should be evenly spaced to ensure smooth shifting.

  • The gearbox should be designed to handle the torque and power of the engine.

  • The gearbox should be lightweight and compact for efficient use of space.

  • The gearbox should be easy to operate and ma...read more

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Q5. Function of dogclutch?

Ans.

A dog clutch is a type of clutch that is used to engage and disengage gears in a manual transmission.

  • It is used to connect and disconnect the engine from the transmission

  • It is called a dog clutch because of the way the teeth on the clutch engage with the gears

  • It is commonly used in racing cars and motorcycles

  • It allows for quick and smooth gear changes

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Q6. Explain arc welding?

Ans.

Arc welding is a welding process that uses an electric arc to melt and join metals.

  • Electric current is used to create an arc between the base metal and the electrode

  • The heat generated by the arc melts the base metal and the electrode, which mix together to form a weld pool

  • As the weld pool cools, it solidifies and forms a strong joint between the two metals

  • Different types of arc welding include shielded metal arc welding, gas metal arc welding, and flux-cored arc welding

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Q7. Otto cycle in detail

Ans.

Otto cycle is a thermodynamic cycle used in spark-ignition engines.

  • It consists of four processes: intake, compression, power, and exhaust.

  • During the intake stroke, the fuel-air mixture is drawn into the cylinder.

  • In the compression stroke, the mixture is compressed to a high pressure and temperature.

  • The power stroke is where the spark plug ignites the mixture, causing it to rapidly expand and push the piston down.

  • Finally, in the exhaust stroke, the spent gases are expelled fro...read more

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