30 SSB Interview Technical Questions For Mechanical Engineering Student

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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.

Rapping allowance is provided on a pattern to take care of – easy withdrawal
Mandrels are used to hold – hollow work pieces
An ideal machine is one whose efficiency is – 100%
The maximum stress produced in a bar of tapering section is at – smaller end
The ratio of the largest load in a test to the original cross-sectional area of the test piece is called – ultimate stress
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
The value of gas constant (R) in S. I. units is – 287 J/kgK
Cut-off governing as compared to throttle governing is – more efficient and more economical
In a nozzle, whole frictional loss is assumed to occur between – throat and exit
The dedendum circle diameter is equal to (where φ = Pressure angle) – pitch circle diameter x cos φ
In a four stroke cycle petrol engine, the charge is ignited at – 30° before top dead centre
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as – volumetric efficiency
The lead screw of a lathe with nut forms a – screw pair
The heat is transferred by conduction, convection and radiation in – boiler furnaces
In back-hand welding, the angle between the welding torch and the work is kept as – 50°-60°
Internal gears can be made by – shaping with pinion cutter
Which part of the automobile tyre is subjected to greatest flexing action? – Side wall
The process which improves the machinability of steels, but lowers the hardness and tensile strength, is – spheroidising
In order to avoid excessive multiplication of facilities, the layout preferred is – process layout
The process capability of a machine is defined as the capability of the machine to – produce a definite volume of work per minute
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)
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
What is the correct formula for loss at the exit of a pipe? — hL = (V2 / 2g)
Guest’s theory of failure is applicable for following type of materials—ductile
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
Laplace transform of the function sinωt is- ω/(s² + ω²)
Which process will increase the fatigue duration of parts? — shot-peening
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)
The divergence of the vector field (x − y) i + (y − x) j + (x + y + z)k is— 3
The permissible stress for carbon steel under static loading is generally taken as—(4000-4500 kg/cm2)