Shell Senior Instrument Engineer Interview Questions and Answers for Experienced

Q1. Ritik Kumar Maurya
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Q2. Indian oil corporation limited Panipat
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Q3. One year apprentice training in Instrumentation and control
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Q1. How many years experience?
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Q2. What is tha qualification?
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The qualification for an Instrumentation Technician typically includes a degree or diploma in instrumentation technology or a related field.
• A degree or diploma in instrumentation technology or a related field is usually required.

• Knowledge of electrical and electronic systems is important.

• Experience with calibration and troubleshooting of instruments is often necessary.

• Familiarity with industry standards and regulations...read more
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Q3. Is currently working?
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Q4. Before working company
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Q1. What is Thermocouple range?
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Thermocouple range refers to the temperature range within which a thermocouple can accurately measure temperature.
• Thermocouple range varies depending on the type of thermocouple used.

• Common thermocouple types include J, K, T, E, and N.

• For example, a type K thermocouple has a range of -200 to 1350 degrees Celsius.

• It is important to select the appropriate thermocouple type for the temperature range being measured.
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Q2. What is anti surge valve?
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An anti-surge valve is a control valve used in a compressor system to prevent surge and maintain stable operation.
• An anti-surge valve is typically installed in the discharge line of a compressor.

• It is designed to protect the compressor from surge, which is a phenomenon of unstable flow and pressure that can cause damage to the compressor.

• The valve opens or closes based on the compressor's operating conditions to mainta...read more
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Q3. Are you working gas turbine?
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Yes, I have experience working with gas turbines.
• I have worked with gas turbines in my previous job as an instrumentation technician.

• I am familiar with the maintenance and troubleshooting of gas turbines.

• I have experience in calibrating and testing gas turbine sensors and instruments.

• I have knowledge of the safety protocols and regulations related to gas turbines.
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Q4. How many types vibration is there in field?
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There are three types of vibration in the field: axial, radial, and tangential.
• Axial vibration occurs parallel to the axis of rotation.

• Radial vibration occurs perpendicular to the axis of rotation.

• Tangential vibration occurs at a right angle to both axial and radial vibration.

• Vibration analysis is used to detect and diagnose problems in rotating machinery.

• Excessive vibration can lead to premature failure of bearings, g
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Q5. Are you know that preventive maintenance jobs?
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Yes, I am familiar with preventive maintenance jobs.
• Preventive maintenance involves regularly scheduled inspections, cleaning, and repairs to prevent equipment breakdowns.

• I have experience performing preventive maintenance on various types of instrumentation equipment, such as calibrators, transmitters, and controllers.

• Examples of preventive maintenance tasks I have performed include checking for leaks, replacing worn ...read more
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Q1. Are you instrument technician?
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Q2. What kind of precautions need in Plant running time?
Ans. 
Precautions are necessary to ensure safe and efficient plant operation.
• Regular maintenance of equipment and machinery

• Proper training and certification of personnel

• Strict adherence to safety protocols and procedures

• Regular inspections and audits to identify potential hazards

• Effective communication and coordination among team members

• Use of personal protective equipment (PPE) as required

• Emergency response planning and dri...read more
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I am interested to work in maintenance field and troubleshooting

Q1. Process instrument caliberation f&g
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Q2. Control valve assembling
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Q1. Trabalshoting RTU VFD and FT, PT TT
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Q2. PLC related questions
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Q3. Programin related questions
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Q4. Scada related any questions
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Q5. Emarson plc trabalshoting CPU radio configuration question
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Q6. Tubing fitting size and installation work
Ans. 
Tubing fitting size and installation work
• The tubing fitting size should match the size of the tubing being used

• Proper installation techniques should be followed to ensure a secure and leak-free connection

• Common types of tubing fittings include compression, flare, and push-to-connect fittings
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Q7. Instrument calibration PT, FT, LT, TT, ETC..
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Q1. Why 4-20 mA Preferred over 0-20 mA signal ?
Ans. 
4-20 mA signal is preferred over 0-20 mA signal due to its ability to detect faults and provide a clear zero point.
• 4-20 mA signal has a clear zero point, making it easier to detect faults in the system.

• It allows for a wider range of measurement values, as the 0-4 mA range can be used to indicate faults or out-of-range conditions.

• 4-20 mA signal is less susceptible to noise and interference compared to 0-20 mA signal.

• It ...read more
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Q2. What is the Purpose of an orifice Tab?
Ans. 
An orifice tab is used to accurately measure the flow rate of a fluid through a pipeline.
• It creates a differential pressure across the orifice plate, which is proportional to the flow rate.

• The tab is placed upstream of the orifice plate to ensure accurate measurement.

• The tab can be designed in different shapes and sizes depending on the application.

• It is commonly used in industries such as oil and gas, chemical, and wa...read more
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Q3. How do you identify an orifice in the pipeline ?
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An orifice in a pipeline can be identified by measuring the pressure drop across it.
• Measure the pressure drop across the pipeline using a differential pressure transmitter

• Compare the pressure drop with the expected value for the given orifice size

• Use a flow meter to confirm the flow rate through the orifice

• Inspect the pipeline for any markings or labels indicating the presence of an orifice
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Q4. Why is the orifice tap provided ?
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Orifice tap is provided to measure the pressure drop across the orifice plate.
• Measures pressure drop

• Helps calculate flow rate

• Used in flow measurement systems
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Q5. Why is the Orifice tab provided ?
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Orifice tab is provided to indicate the size of the orifice and its flow rate.
• Orifice tab helps in identifying the size of the orifice and its flow rate.

• It is used in flow measurement devices like orifice plates, venturi meters, etc.

• The tab is usually made of stainless steel and is welded to the orifice plate.

• The tab is marked with a number or letter to indicate the size of the orifice.

• The flow rate can be calculated u...read more
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Q6. What is the main difference between RTD and Thermistor?
Ans. 
RTD measures temperature using resistance while thermistor uses resistance-temperature relationship.
• RTD has a linear resistance-temperature relationship while thermistor has a non-linear one.

• RTD has a higher accuracy and stability compared to thermistor.

• RTD is more expensive than thermistor.

• RTD is commonly used in industrial applications while thermistor is used in consumer electronics.

• Examples of RTD include platinum,...read more
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Q1. Process control parameters
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Q2. Control process parameters
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