List of top Mechanical Engineering Questions asked in TANCET

A heat pump operates on Carnot cycle pumps heat from a reservoir at 27°C to 327°C. The Coefficient of performance is
Calculate the matrix product \( C = AB \), where
\[A = \begin{bmatrix} 5 & 3 & 1 \\ 4 & 6 & 2 \\ 10 & 3 & 4 \end{bmatrix}, \quad B = \begin{bmatrix} 1 & 5 \\ 2 & 4 \\ 3 & 2 \end{bmatrix}\]
Which of the statements is not true for Bainite, which is a micro constituent in Iron–Carbon Alloys?
What structure is formed in the heat affected zone of a medium carbon steel weld due to rapid cooling?
Air enters the compressor at 100 kPa and 25°C having the volume of 1.8 m3/kg and compressed to 5 bar isothermally. The change in internal energy during the process is
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\(^2\).
A wire of length L and radius r is rigidly clamped from one end and the other end is pulled by force F. It is found that the wire elongates by 5 cm. Another wire of the same material but 4L length and 4r radius is pulled by 4F force under identical conditions. What will be the final elongation of the wire?
The condition for a screw jack to be self-locking is that:
If Stanton number is 0.5, Reynolds number is 39 and Nusselt number is 390, then the Prandtl number is:
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
A boiler drum consists of a cylindrical portion 4 m long, 1.5 m in diameter, and 2.25 cm thick. It is closed by hemispherical ends. In a hydraulic test to 6 MN/m\(^2\), how many liters of additional water will be pumped in after initial filling at atmospheric pressure? The hoop strain at the junction of the cylinder and hemisphere may be assumed to be the same for both.
Consider \( E = 200 \) GN/m\(^2\); for water, \( K = 2.13 \) GN/m\(^2\) and \( 1/m = 0.3 \).
Consider the indicator diagram for the heat engine as shown in the following figure. If the heat rejected by the engine to a heat sink is 1250 kJ/kg, the thermal efficiency (by considering one decimal place) of the engine is:
heat engine
The application for which a point to point numerical control system can be employed is a
The maximum pull in the tie rods of a turnbuckle used in the roof truss is 4.5kN. The tie rods are made of steel 40C8 ( 380 / ) 2 Syt = N mm and the factor of safety is 5. Determine the nominal diameter of the threads on the tie rod on the basis of maximum principal stress theory. Assume dc = 0.8d.
A pool is filled with water and the pool has a maximum depth of 100 m. If the atmospheric pressure is 101 kPa, the absolute pressure at 100 m depth of the pool is:
Cracks appear in weld and base metal when the localized stresses exceed the ——––––––––– strength of a metal.
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:
The term “bulk” in bulk deformation processes describes the work parts that have ——––––––––– ratio.
In a hydraulic system, the point of intersection of the line of action of the resultant hydrostatic force and the corresponding surface is known as:
Identify the operation related to drilling which is illustrated in Figure below.
operation related to drilling
In a Vapour Compression Refrigeration System (VCRS), if throttle valve is replaced with expansion cylinder, the COP will
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 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?
All of the following options describe the availability and unavailable energy of a system EXCEPT:
If SH, LH represents Sensible Heat and Latent Heat respectively, then identify the CORRECT relation for Sensible Heat Factor (SHF) from the given options.