Qatar Petrochemical Company Mechanical Engineer Interview Questions and Answers

Q1. Introduction your self brief.
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Q2. Technical questions related to your job profile.
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Q1. How many gasket in floting head heat exchanger
Ans. 
The number of gaskets in a floating head heat exchanger varies depending on the design and size of the exchanger.
• The number of gaskets is typically determined by the number of tube passes in the heat exchanger.

• Each tube pass may require multiple gaskets, depending on the design.

• The gaskets are used to create a seal between the floating head and the tube sheet.

• The number of gaskets can range from a few to several dozen,...read more
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Q2. Types of heat exchanger
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Heat exchangers are devices used to transfer heat between two or more fluids.
• Shell and tube heat exchanger

• Plate heat exchanger

• Fin tube heat exchanger

• Double pipe heat exchanger

• Spiral heat exchanger

• Regenerative heat exchanger
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Q1. Mechanical maintenance
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Q2. Rotating equipments centrifugal pump, compressor.
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Q1. I not selected but I suggest all mechanical engineering do preparation on fluid,thermal, oils hydraulic, machine, metallurgy etc along with aptitude
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Q1. How much experience do you have?
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Q2. Why do you want to change company?
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Q1. Electrical related questions like star delta motor load protection and transformer protection
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Engineering reasoning

Q1. Types of chiller, compressor & plastic,
Ans. 
There are different types of chillers, compressors, and plastics used in engineering.
• Types of chillers include absorption, centrifugal, and screw chillers.

• Compressors can be classified as reciprocating, rotary, and centrifugal compressors.

• Plastics used in engineering include polyethylene, polypropylene, and polystyrene.

• Each type of chiller, compressor, and plastic has its own unique properties and applications.
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Q2. Pneumatic & hydraulic, valves & actuators
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Q3. Cooling tower, range, approach
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Q4. Gear box & its types
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Gear box is a mechanical device that transmits power from an engine to the wheels. There are various types of gearboxes.
• Gearboxes are used in automobiles, industrial machinery, and other applications.

• The most common types of gearboxes are manual, automatic, and continuously variable transmissions (CVT).

• Manual gearboxes require the driver to manually shift gears using a clutch and gear stick.

• Automatic gearboxes shift ge...read more
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