List of top Mechanical Engineering Questions

Joule’s experiment states that for a cyclic process
During one cycle the working fluid in an engine engages in two work interactions: 15 kJ to the fluid and 45 kJ from the fluid, and three heat interactions, two of which are known: 75 kJ to the fluid and 40 kJ from the fluid. The magnitude and direction of the third heat transfer is
A solid uniform shaft of circular cross section is subjected to a maximum bending moment of 3 kNm and a twisting moment of 4 kNm. The equivalent torsional moment is
An element is subjected to a tensile stress of 60 MPa and a shear stress of 40 MPa. If the material has the yield strength obtained in a simple tensile test is 320 MPa, the factor of safety based on maximum principal stress theory is
Two mating spur gears have 36 and 108 teeth, respectively. The pinion rotates at 1200 rpm and transmits a torque of 20 Nm. The torque transmitted by the gear is
In the multiple disc clutch, if there are six discs on the driving shaft and five discs on the driven shaft, then the number of pairs of contact surfaces will be
In eccentric loading of welds, the stress which vary from point to point as proportional to its distance from the centre of gravity, is known as:
The design stress for a component subjected to a completely reversible load, is found by applying the factor of safety to:
The area under the turning moment diagram represents
In a simple gear train, if the number of idler gears is odd, then the direction of motion of the driven gear will be:
Whirling speed of a shaft coincides with the natural frequency of its:
The natural frequency of a spring-mass system is 2 Hz. When an additional mass of 1 kg is added to the original mass \( m \), the natural frequency is reduced to 1 Hz. The original mass \( m \) is
A 10 kg mass is supported on a spring of stiffness 4 kN/m and has a dashpot which produces a resistance of 20 N at a velocity of 0.25 m/s. The damping ratio of the system is:
The direction of the linear velocity of any point on the kinematic link relative to any other point on the same kinematic link is
Maximum shear stress developed on the surface of a solid circular shaft under torsion is 240 MPa. If the shaft diameter is doubled, then the maximum shear stress developed corresponding to the same torque will be:
A column fixed at one end and free at the other end buckles at a load P. Now, both the ends of the column are fixed. What is the buckling load for these end conditions?
A bar of length \( L \), area of cross-section \( A \), is subjected to a tensile force \( P \). If \( E \) is the Young's modulus of the bar, the strain energy \( U \) stored in the body is:

The number of degrees of freedom of the mechanism shown in Figure is

In a four-bar mechanism ABCD, the link lengths are given: AB = 800 mm, BC = 100 mm, CD = 400 mm, DA = 700 mm. If the mechanism is a double crank mechanism then the fixed link should be
The total number of instantaneous centres for a mechanism of \( n \) links are:
A slider sliding at 100 mm/s on a link which is rotating at 60 rpm is subjected to Coriolis acceleration of magnitude:
State of stress at a point of a loaded component is given by normal stresses \( \sigma_x = 30 \, \text{MPa} \), \( \sigma_y = 18 \, \text{MPa} \), and shear stress \( \tau_{xy} = 8 \, \text{MPa} \). What are the principal stresses?
If the shear force diagram for a beam is a triangle with the length of the beam as its base, the beam is
A beam has rectangular section with width and depth as 100 mm \( \times \) 200 mm. If it is subjected to maximum bending moment of 40 kN-mm, then the minimum bending stress developed would be
The ratio of area under the bending moment diagram to the flexural rigidity between two points of a beam gives the change in