List of top Mechanical Engineering Questions asked in TS PGECET

The whirl component of turbine blades is zero for the following turbine.
In an axial flow compressor, if the air stream is not able to follow the blade contour such phenomena is known as
In an ideal Brayton power cycle operated for the gas turbine plant, if \(T_1\) is the minimum temperature, \(T_3\) is the maximum temperature and pressure ratio is \(r_p\), then the net work ratio is given as
If regenerator is added to a Brayton cycle, the thermal efficiency is improved due to
Generally, in spark ignition engines, the compression ratio cannot be enhanced beyond certain limit because to avoid
In a CI engine, the delay period in the combustion process mainly corresponds to
The maximum amount of low grade energy, which is convertible into work is known as
Two reversible heat engines are operated with same heat input and heat output. One of the engine is operated between the temperature limits of \(T_2\) and 200 K & another is between 800 K and \(T_2\). Then the value of \(T_2\) is
A balloon containing an ideal gas is initially kept in an evacuated and insulated room. If the balloon ruptures and the gas fills the entire room, what is the correct statement at the end of the process?
Based on second law of thermodynamics the loss in available energy is being quantified as
The clearance is provided in the reciprocating compressor with clearance ratio of ‘k'. If the pressure ratio is \(\frac{P_2}{P_1}\), then the volumetric efficiency in terms of clearance ratio k, is
If a substance is perfect crystal and existing at absolute zero K, then the specific entropy of the substance is
In a combined cycle for power generation, if the topping cycle has an efficiency of 45% and for bottoming cycle 30%, then the combined efficiency of the cycle is
A real gas undergoes throttling from 50 bar to 10 bar from an initial temperature of 300 K. If \(\mu_{JT} = -0.05 \text{ K/bar}\) for the initial condition, what is the approximate value of the exit temperature?
A mixture of gas expands from \(0.03 \text{ m}^3\) to \(0.06 \text{ m}^3\) at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
Expansion bellows are provided in the shell and tube heat exchangers in order to
If the surface temperature of hot body is doubled, then rate of radiation energy emitted will be enhanced by a factor of
On the specified surface, if \(35 \%\) of incident radiation energy is reflected and the transmissivity of the body is \(0.3\), then the emissivity of the surface is
A pipe friction test shows that, over the range of speeds used for the test, the non-dimensional friction factor varies inversely with Reynolds number. From this, one can conclude that the
For heat transfer calculation in fins, if the Biot number is very small (\(\text{Bi} < 0.1\)) it implies
During a summer day a scooter rider feels more comfortable while on the move than while at rest at a stop light because
The characteristic length (\(\text{L}_{\text{c}}\)) for the calculation of Biot number (\(\text{Bi}\)) for a sphere of radius 'R' subjected to Newtonian cooling is
In turbulent flow, the loss of pressure head is approximately (where v is the velocity of flow)
For a fully developed flow through a pipe, how will the heat transfer coefficient (h) change, when the mean flow rate is doubled with all other conditions remaining the same?
A pipe line has a diameter of \(5 \text{ cm}\) in which water flows at a pressure of \(10^5 \text{ N/m}^2\) with a mean velocity of \(2 \text{ m/s}\). If the head of the water at the cross section is \(5 \text{ m}\) above the datum line and consider \(g = 10 \text{ m/s}^2\), then the total head is