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Tuesday, April 23, 2024

30 SSB Interview Technical Questions For Mechanical Engineering Student

Mechanical Engineering students who are going to attend the SSB interview of EKT exam can check these basic technical questions which they might face in SSB personal interview and in EKT (AFCAT). What technical questions have you faced in your SSB interview? Do comment below.


  1. Rapping allowance is provided on a pattern to take care of – easy withdrawal
  2. Mandrels are used to hold – hollow work pieces
  3. An ideal machine is one whose efficiency is – 100%
  4. The maximum stress produced in a bar of tapering section is at – smaller end
  5. The ratio of the largest load in a test to the original cross-sectional area of the test piece is called – ultimate stress
  6. Overall efficiency of a centrifugal pump is the ratio of – actual work done by the pump to the energy supplied to the pump by the prime mover
  7. The value of gas constant (R) in S. I. units is – 287 J/kgK
  8. Cut-off governing as compared to throttle governing is – more efficient and more economical
  9. In a nozzle, whole frictional loss is assumed to occur between – throat and exit
  10. The dedendum circle diameter is equal to (where φ = Pressure angle) – pitch circle diameter x cos φ
  11. In a four stroke cycle petrol engine, the charge is ignited at – 30° before top dead centre
  12. The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as – volumetric efficiency
  13. The lead screw of a lathe with nut forms a – screw pair
  14. The heat is transferred by conduction, convection and radiation in – boiler furnaces
  15. In back-hand welding, the angle between the welding torch and the work is kept as – 50°-60°
  16. Internal gears can be made by – shaping with pinion cutter
  17. Which part of the automobile tyre is subjected to greatest flexing action? – Side wall
  18. The process which improves the machinability of steels, but lowers the hardness and tensile strength, is – spheroidising
  19. In order to avoid excessive multiplication of facilities, the layout preferred is – process layout
  20. The process capability of a machine is defined as the capability of the machine to – produce a definite volume of work per minute
  21. If brakes are applied on front wheels of a car and if it moves on a level road, then retardation of the car is calculated using the formula– (μ g x) / (l- μ h)
  22. A journal of 120 mm diameter rotates in a bearing at a speed of 1000 rpm. What is the power lost during friction if 8 kN radial load acts on the journal and coefficient of friction is 2.525 x 10-3? — 0.126 kW
  23. What is the correct formula for loss at the exit of a pipe? — hL = (V2 / 2g)
  24. Guest’s theory of failure is applicable for following type of materials—ductile
  25. The angle between two unit-magnitude coplanar vectors P(0.866, 0.500, 0) and Q(0.259, 0.966, 0) will be— 45 degrees
  26. Laplace transform of the function sinωt is- ω/(s2 + ω2)
  27. Which process will increase the fatigue duration of parts? — shot-peening
  28. The directional derivative of the scalar function f (x,y,z) = x2+ 2y2+ z at the point P = (1, 1, 2) in the direction of the vector a = 3i − 4j is–        (-2)
  29. The divergence of the vector field (x − y) i + (y − x) j + (x + y + z)k is— 3
  30. The permissible stress for carbon steel under static loading is generally taken as—(4000-4500 kg/cm2)

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Ravinder Tanwar
Ravinder Tanwarhttps://ssbcrack.com/
A resident of Jaipur. I am a KVian who is passionate to join Indian Defense Force. I started giving SSB from NDA. After completing my B.Tech in 2012, currently I am working as a Software Engineer in Jaipur in a private company, but the passion is still alive in my soul.
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