List of top Questions asked in TS PGECET- 2026

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
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
If a substance is perfect crystal and existing at absolute zero K, then the specific entropy of the substance is
The maximum amount of low grade energy, which is convertible into work is known as
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 the surface temperature of hot body is doubled, then rate of radiation energy emitted will be enhanced by a factor of
Expansion bellows are provided in the shell and tube heat exchangers in order to
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
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
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
In turbulent flow, the loss of pressure head is approximately (where v is the velocity of flow)
During a summer day a scooter rider feels more comfortable while on the move than while at rest at a stop light because
For heat transfer calculation in fins, if the Biot number is very small (\(\text{Bi} < 0.1\)) it implies
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
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?
When a body is floating in the liquid and given a small angular displacement, then the body starts oscillating about a centre. That centre is called as
The variation of volume of liquid with respect to the pressure and its reciprocal respectively are
For the fluid flowing over the flat plate, the state of boundary layer separation occurs when
If the net rotation of fluid particles about their mass centre remains zero, then such type of flow is known as
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