List of top Mechanical Engineering Questions asked in Telangana State Post Graduate Engineering Common Entrance Test

The ratio of speed of a Pelton wheel and the speed of the jet for maximum head efficiency is
According to the Joules law of a perfect gas, the internal energy is a function of
The volumetric efficiency of a reciprocating compressor has the clearance ratio 'k' and the pressure ratio p2/p1 is calculated by using the following equation
Generally, the rotary compressors are used for delivering the following conditions:
For the same compression ratio and heat rejection, the thermal efficiency is:
During the compression process of a vapor compression refrigeration system:
Consider the following statement and choose the correct one I. Dew point is reached by cooling the air at constant moisture content
II. Wet bulb temperature changes by addition of moisture at constant enthalpy
III. For saturated air, dry bulb, wet bulb and dew point temperatures are same
IV. Dehumidification of air is achieved by heating
The air standard efficiency of the Diesel cycle reaches that of the Otto cycle when the following condition is satisfied:
The COP of heat pump in comparison with COP of refrigeration cycle for the specified temperature limits is given by
In a polytropic process, heat rejected is given by
“Heat cannot flow by itself from a body at lower temperature to a body at higher temperature” and can be done by the supply of external work is
2 kg of a substance receives 500 kJ heat and undergoes a temperature change from 100 $^\circ$C to 200 $^\circ$C. The average specific heat of the substance during the process (in kJ/kg K) will be
The equation for the state of real gas in terms of reduced form is
A reversible engine is being operated with the temperature limits of 800 K and 300 K. If it takes heat 560 kJ, then the available energy and unavailable energy are
For the fins arrangement, when the other conditions are remaining same, to get better effectiveness the fins should be
If 'k' is the thermal conductivity, '$ \rho $' is the mass density and 'c' is the specific heat then the thermal diffusivity of substance is
Radiation heat transfer in the system is characterized by
The slope of curve on p-V diagram for different processes
In the lumped mass system of transient analysis, for calculation of Biot number, the characteristic length should be considered as the ratio of
For flow over a flat plate, the hydrodynamic boundary layer thickness is 0.5 mm. If the dynamic viscosity is $ 25 \times 10^{-16} \, \text{Pa-s} $, specific heat is 2000 J/kg·K, and the thermal conductivity is 0.05 W/m·K, then what would be the thermal boundary layer thickness?
A heat exchanger has been designed with heat transfer surface area of ‘A’ and overall heat transfer coefficient ‘U’, handling two different fluids of heat capacities $ C_{\text{min}} $ and $ C_{\text{max}} $. The parameter NTU used in the analysis of heat exchanger is specified as:
A hollow pipe of 10 mm outer diameter is to be insulated by thick cylindrical insulation having thermal conductivity of 1 W/m K. The surface heat transfer coefficient on the insulation surface is 5 W/m$ ^2 $ K. What is the minimum effective thickness of insulation for causing the reduction in heat leakage from the insulated pipe?
A rectangular block with density of 720 kg/m$^3$ floats in fluid having the relative density of 0.8. What percentage of block will remain exposed?
A fountain has to be designed to raise water to a height of 20 m from the ground level. What would be the speed of water and pressure to be applied by taking g = 10 m/s$^2$?
For a rotational flow, the ratio of normal velocity vector to the angular velocity vector is