IES- Indian Engineering Service Exam is a paper-pen based, four-part government service examination directed by the Union Public Service Commission for recruitment of engineers in the Engineering Services of the Government of India.

the Interview Question of the IES Examination is divided into the Technical And Personal Question,

the Personal Question Are About personal info like place of birth,Btech College etc from DAF.
abut internship project like how u got selected,what are ur contribution in projects done ther e,application of project in real world.
, technical round begins and questions covering almost every major topic was asked like what are fits,gauges,shaft-hole design,psychrometric chart,ac design,NOx emissions,volatile organic compounds,deflection obeams,nanomaterials,corrosion,fatigue etc.


the Sample Question of the IES Examination is given below


What was your role as a R&D engineer in your previous organisation?
What is a hybrid vehicle?
What is refractive index? ( Asked to me as I had told them that I had been then teaching optics in a coaching institute.)
Why does a swimming pool apparently appear to be shallow?
. How do you explain the fact that on a hot summer day, a road appears to be wet on the surface from a distance where as it is actually not?
What are the different types of lasers?
Is it possible to machine/cut a material with laser? What are the drawbacks of laser machining?
What is your favorite subject ?
What is specific heat?
In order to measure specific heat of water, what is the temperature range considered? Why?
What is thermal equilibrium?
What is the zeroth law of thermodynamics?
What is the flame speed inside the cylinder of an S.I. engine?
What is mach no.?
What is the mach no. for supersonic and subsonic flow?
What is the value of mach no. beyond which the flow for a gas is considered compressible?
How is a gun manufactured?
What is the value of length/radius in case of gun drilling?
Draw the diesel cycle and explain the cutoff ratio?
Also show the intake and exhaust stroke in the diagram.
Why does a plane fly? What is the wing profile?
. Explain the different types of aircraft engines.