HMEL's Guru Gobind Singh Petroleum Refinery Interview Questions and Answers

Q1. Types of RTD'S, THERMOCOUPLE, Control Valve, ON/OFF VALVE, PROXIMITY SENSOR, SWITCH, LOAD CELL,
Ans. 
Types of RTD's, thermocouples, control valves, on/off valves, proximity sensors, switches, and load cells used in instrumentation.
• RTD's (Resistance Temperature Detectors) - platinum, nickel, copper

• Thermocouples - Type K, Type J, Type T

• Control Valve - globe valve, butterfly valve, ball valve

• On/Off Valve - solenoid valve, gate valve, diaphragm valve

• Proximity Sensor - inductive sensor, capacitive sensor, ultrasonic sensor

• ...read more
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Q2. Typey of Transmitter( LT,PT, FT ,DPT, RADAR, MASS FLOW),
Ans. 
Transmitters used in instrumentation include LT, PT, FT, DPT, RADAR, and MASS FLOW.
• LT - Level Transmitter measures the level of a substance in a tank or container.

• PT - Pressure Transmitter measures pressure in a system.

• FT - Flow Transmitter measures the flow rate of a substance in a pipe or channel.

• DPT - Differential Pressure Transmitter measures the difference in pressure between two points.

• RADAR - Radar Transmitter u...read more
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Q3. Types of SOV'S, Gauges , limit switch
Ans. 
Types of SOV's, gauges, and limit switches used in instrumentation.
• Types of SOV's: solenoid-operated valves, pneumatic valves, electrically-operated valves

• Types of gauges: pressure gauges, temperature gauges, level gauges

• Types of limit switches: mechanical limit switches, proximity limit switches, photoelectric limit switches
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Q4. AFR, BUSTER, Positioner,
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Q5. Vibration Sensor, speed sensor
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Diploma in Electronics Engg.

Diploma in Electronics Engg