List of top Mechanical Engineering Questions

A heat pump operates on Carnot cycle pumps heat from a reservoir at 27°C to 327°C. The Coefficient of performance is
A hollow rectangular column has external and internal dimensions as 2.4m × 1.8m and 1.2m × 1.2m respectively. Calculate the safe load that can be placed at an eccentricity of 0.5 m on a plane bisecting the longer side, if the maximum compressive stress is not to exceed 5 MN/m\(^2\).
If SH, LH represents Sensible Heat and Latent Heat respectively, then identify the CORRECT relation for Sensible Heat Factor (SHF) from the given options.
A riveting machine is driven by a constant torque 3 kW motor. The moving parts including the flywheel are equivalent to 150 kg at 0.6 m radius. One riveting operation takes 1 second and absorbs 10000 N-m of energy. The speed of the flywheel is 300 r.p.m. before riveting. Find the speed immediately after riveting. How many rivets can be closed per minute?
For a balanced counter flow heat exchanger where \( \dot{m}_h C_{ph} = \dot{m}_c C_{pc} \), the logarithmic mean temperature difference (LMTD) and temperature profile is:
The following are the selection characteristics considered while choosing a material for brake lining. Identify the incorrect characteristic.
In laser beam welding, ——––––––––– are associated with the evolution of vapor from the surface of the material to produce a needle-like, vapor-filled cavity or keyhole in the work piece through which the beam can penetrate.
Identify the operation related to drilling which is illustrated in Figure below.
operation related to drilling
Identify the correct type of defect for casting shown below: 
defect for casting
A slab of 250 mm thick is made up of material ‘X’ and its thermal conductivity is 500 W/m·K. One of the surface is kept at 100°C and another surface is maintained at 25°C. The net heat flux across the surface is:
Identify the operation which cannot be performed using a conventional lathe.
The term “bulk” in bulk deformation processes describes the work parts that have ——––––––––– ratio.
In a machining operation that approximates orthogonal cutting, the cutting tool has a rake angle of 10°. The chip thickness before the cut \(t_0 = 0.50\) mm and the chip thickness after the cut \(t_c = 1.125\) mm. The shear plane angle \(\phi\) is ——–––––––––.
Assuming \(\sin 10^\circ = 0.173\) and \(\cos 10^\circ = 0.984\).
A bullet is fired upwards at an angle of \(30^\circ\) to the horizontal from a point P on a hill, and it strikes a target which is 80 m lower than P. The initial velocity of the bullet is 100 m/s. Calculate the maximum height to which the bullet will rise above the horizontal. Assume \( g = 9.81 \) m/s\(^2\).
Currently, eighty-five percent of all neck injuries are caused by rear-end car collisions. To alleviate this problem, an automobile seat restraint has been developed that provides additional pressure contact with the cranium. During dynamic tests, the distribution of load on the cranium has been plotted and shown to be parabolic. Determine the equivalent resultant force and its location, measured from point A. 
neck injuries
The gearing of a machine tool is shown in the below figure. The motor shaft is connected to gear A and rotates at 975 rpm. The gear wheels B, C, D, and E are fixed to parallel shafts rotating together. The final gear F is fixed on the output shaft. What is the speed of gear F? The number of teeth on each gear are as follows: \( A=20 \), \( B=50 \), \( C=25 \), \( D=75 \), \( E=26 \), and \( F=65 \). 
gearing of a machine tool
Calculate the power transmitted through a belt drive (in kW) if tension on tight and slack sides are 200 N and 50 N, respectively. The linear velocity of belt speed is 10 m/s.
The condition for a screw jack to be self-locking is that:
Which of the following is an incorrect operation in relation to the finishing processes employed for gear teeth?
The characteristics of Planck's black body radiation distribution is given in the options. Which of the following is NOT a characteristic of Planck's black body radiation distribution?
A 6×19 wire rope with fiber core and tensile designation of 1570 is used to raise the load of 20 kN as shown in the below figure. The nominal diameter of the wire rope is 12 mm, and the sheave has 500 mm pitch diameter. Determine the expected life of the rope in years assuming 500 bends per week. 
wire rope with fiber core and tensile designation

Match List I with List II:

LIST I 
Mechanical Drive		LIST II 
Function
A. CamsI. Lock a mechanism when it is holding a load.
B. GearsII. Movement of one part relative to another with minimum friction and maximum accuracy.
C. RatchetsIII. Imparts a reciprocating or oscillatory motion to another body in contact.
D. BearingsIV. Transmission of rotary motion between parallel and inclined shafts.

Choose the correct answer from the options given below:

Match List I with List II:

LIST I (Robot Configuration)LIST II (Joints)
A. CylindricalI. RRR
B. CartesianII. RPP
C. SphericalIII. PPP
D. ArticulatedIV. RRP

Choose the correct answer from the options given below:

The human eye perception is limited to approximately
The link parameters are