1. What is the gas inside hydraulic accumulator ? 2. How proportional valve is different from Servo valve ? 3. Difference between diesel and petrol engine ? 4. Different types of bearing with application ? 5. Why lubrication in gears are important ? 6. Types of pumps with application ? (e.g. gear pump, screw pump etc.)

Question

Accepted Answer

The interview questions cover topics related to hydraulic systems, engines, bearings, lubrication, and pumps.

1. The gas inside a hydraulic accumulator is typically nitrogen, which is used to store energy in the form of compressed gas.
2. Proportional valves control flow rate based on an input signal, while servo valves control flow rate based on feedback from a sensor.
3. Diesel engines use compression ignition, while petrol engines use spark ignition.
4. Types of bearings include ball bearings (used in wheels), roller bearings (used in conveyor belts), and plain bearings (used in sliding mechanisms).
5. Lubrication in gears is important to reduce friction, wear, and heat generation.
6. Types of pumps include gear pumps (used in automotive systems), screw pumps (used in oil drilling), and centrifugal pumps (used in water treatment).

Accepted Answer

1 Compressed gas or charged closed accumulator
2.the input power of prpoptional valve is typically large whereas servo valve have smaller input power
3.in petrol engine fuel and air both are compressed with spark while in diseal engine only air is compressed and fuel is injected in compressed air
4. Ball bearing roller bearing plain bearing needle bearing etc application they facilitate smooth motion axial and radial loads.
5. The protective layer of lubricant helps to prevent wear and tear by reducing metal to metal contact.
6. Centrifugal pumps, diaphragm pumps, gear pumps, hand pumps jet pumps etc. They are used for irrigation, water supply, gasoline, air conditioner etc

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