Q. A ball of mass 3 kg moving with a velocity of 4 m/s undergoes a perfectly-elastic direct-central impact with a stationary ball of mass m. After the impact is over, the kinetic energy of the 3 kg ball is 6 J. The possible value(s) of m is/are ...

Q. The derivative of f(x) = cos(x) can be estimated using the approximation (A) < 0.1 %(B) > 0.1 % and < 1 %(C) > 1 % and < 5 %(D) > 5 % Ans: > 0.1 % and < 1 % Sol:

Q. In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is 200 V and the capacitance of the RC circuit is 50 µF. The energy (in J) released per spark across the IEG is Ans: 1 Sol:

Q. A thin vertical flat plate of height L, and infinite width perpendicular to the plane of the figure, is losing heat to the surroundings by natural convection. The temperatures of the plate and the surroundings, and the properties of the surrounding fluid, are constant. The relationship between ...

Q. Water enters a circular pipe of length L = 5.0 m and diameter D = 0.20 m with Reynolds number ReD = 500. The velocity profile at the inlet of the pipe is uniform while it is parabolic at the exit. The Reynolds number at the exit of the pipe is     . Ans: 500 Sol: Re =ρVD/μ Reynold’s ...

Q. A wire of circular cross-section of diameter 1.0 mm is bent into a circular arc of radius 1.0 m by application of pure bending moments at its ends. The Young’s modulus of the material of the wire is 100 GPa. The maximum tensile stress developed in the wire is_____MPa. Ans: 49 - 51 Sol: ...

Q. The state of stress at a point in a component is represented by a Mohr’s circle of radius 100 MPa centered at 200 MPa on the normal stress axis. On a plane passing through the same point, the normal stress is 260 MPa. The magnitude of the shear stress on the same plane at the same point ...

Q. The figure shows an idealized plane truss. If a horizontal force of 300 N is applied at point A, then the magnitude of the force produced in member CD is_____N. Ans: 0

Q. If x is the mean of data 3, x, 2 and 4, then the mode is           Ans: 3 Sol: Given data are 3, x, 2, and 4

Q. The most common limit gage used for inspecting the hole diameter is              (A) Snap ...

Q. The cold forming process in which a hardened tool is pressed against a workpiece (when there is relative motion between the tool and the workpiece) to produce a roughened surface with a regular pattern is              (A) Roll ...

Q. The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase in              (A) viscosity         (B) surface ...