Mechanical Engineering - Interview Questions

     * How to identify two balls having same external radius and weight, one hollow and the other solid, of different materials?
    * Explain the principle of Watt's Governor.
    * Differentiate between governor and fly wheel.
    * What are Carnot Cycle, Otto Cycle, and Diesel Cycle?
    * Explain simple vapour compression cycle in refrigerator.
    * Which compressor is usually used in AC?
    * Why don't CI engines need a spark plug?
    * Differentiate between lathe and a milling machine.
    * How will you machine a square cross-section in lathe?
    * What are the different processes carried out on a lathe?
    * Explain refrigerator system.
    * What are the refrigerants used in refrigerators, AC, water coolers, walk-in coolers, and freezers?
    * How are AC systems like window AC, split AC, and central AC different from each other?

    * What are Heat Exchangers?
    * What are Conduction, Convection and Radiation?
    * Explain the concept of a black body.
    * What are CNC and DNC machines? Compare.
    * What is the mode of manufacture of common articles like chairs, toothpaste tubes, and pens?
    * What are different cutting tool materials and composition?
    * Tell about cooling fluids and their functions.
    * What is a differential and how does it work?
    * Explain 4-stroke and 2-stroke engines.
    * What are the differences between SI and CI engines?
    * What is ABS, GPS, SBC, SOHC, and DOHC?
    * Explain different types of gears and their applications.
    * Certain vehicles can be started by keeping the gears engaged, while certain others cannot be - explain?
    * What are MPFI and TPFC systems?
    * State the laws of Thermodynamics.
    * Which is your favourite car and why?
    * Which is your favourite two-wheeler and why?
    * Tell us about different types of manufacturing processes.
    * How do you polish a ball bearing?
    * What is the difference between turbo charging and supercharging ?
    * Explain Stephan-Boltzmann Laws, Kirchoff's Law, Planck's Law and Wien's Displacement Law.
    * Explain lubrication system in IC engines.
    * What is SAE?
    * What are the new trends in IC engine? What do you know about CDI, ball piston, camless engines like GDI, VTEC?
    * How does the number of valves per cylinder affect the cycle?
    * How can you differentiate between the inlet and outlet ports?
    * When we start a vehicle, exhaust smoke appears white. Why?
    * What are the various thermodynamic systems? What are the basic definitions?
    * What is triple point of water?
    * What is ASHRAE?
    * What are the different types of turbines and compressors?
    * What is an indicator diagram? What are the features and advantages? How is it different from p-v diagram?
    * What are knocking detonation and pre-ignition? What are the preventive measures adopted?
    * What is meant by Jet Propulsion? Ramjet, Scramjet, Turbojet, Turboprop, and Turbo fan?
    * Explain common automobile specifications.

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