Tata Hitachi Construction Machinery Service Engineer Interview Questions and Answers

Q1. Hydraulic related questions
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Q2. Technical Trouble shooting questions
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Q1. Disel engine combustion process
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The diesel engine combustion process involves the ignition of fuel injected into the combustion chamber by compressed air.
• Diesel fuel is injected into the combustion chamber at high pressure

• The air in the combustion chamber is compressed by the piston, leading to high temperatures

• The high temperature air ignites the fuel, leading to combustion and the generation of power

• The combustion process in diesel engines is more
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Q2. What is two & four stroke engine.
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A two-stroke engine completes a power cycle in two strokes of the piston, while a four-stroke engine completes it in four strokes.
• Two-stroke engines have a simpler design with fewer moving parts compared to four-stroke engines.

• Two-stroke engines typically produce more power for their size but are less fuel-efficient and emit more pollution.

• Four-stroke engines are more common in cars, motorcycles, and larger machinery d...read more
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Q3. What's is hydraulic component.
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A hydraulic component is a device that utilizes fluid power to perform mechanical tasks.
• Hydraulic components use liquid to transmit power.

• Common examples include hydraulic cylinders, pumps, motors, valves, and hoses.

• They are often used in heavy machinery, construction equipment, and industrial applications.
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Q4. What is realy,and working principle
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Realy is a type of relay used in electrical systems to control high power devices with low power signals.
• Relays are switches that open and close circuits electromechanically

• Realy is a type of relay specifically designed for high power applications

• Working principle involves an electromagnet that moves an armature to open or close the circuit

• Commonly used in industrial automation, automotive, and HVAC systems
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Q5. Least count of all megerment.
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Least count is the smallest change in the measured quantity that can be detected by the measuring instrument.
• Least count is determined by the smallest division on the scale of the measuring instrument.

• It is important for accurate measurements and precision in engineering.

• For example, a ruler with millimeter divisions has a least count of 1 mm.

• A vernier caliper with 0.1 mm divisions has a least count of 0.1 mm.
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Two easy level and one medium level code

Q1. From resume and project
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Q1. Electrical switches gear
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Q2. Field service electrical department
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Q3. Any questions for electrical department
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Q1. Sensors, Stress, force, pumps and compressor related questions .
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Q2. 1. what is inductive sensors 2.What is capacitive sensors
Ans. 
Inductive sensors detect metallic objects while capacitive sensors detect any object with a dielectric constant
• Inductive sensors generate a magnetic field that induces eddy currents in metallic objects, causing a change in the sensor's output

• Capacitive sensors use changes in capacitance to detect the presence or absence of an object

• Capacitive sensors can detect non-metallic objects such as liquids, plastics, and paper

• I...read more
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Q1. What is transducer and any application?
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A transducer is a device that converts one form of energy into another. It has various applications in different fields.
• Transducers are used in medical imaging equipment like ultrasound machines.

• They are also used in sensors for measuring physical quantities like temperature, pressure, and strain.

• In audio equipment, transducers are used to convert electrical signals into sound waves.

• Transducers are used in industrial a...read more
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Q2. Tell me about yourself
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