List of top Questions asked in Andhra Pradesh Post Graduate Engineering Common Entrance Test

Which of the following properties is typically NOT enhanced by the addition of carbon in steel?
Which characteristic differentiates thermosetting polymers from thermoplastic polymers?
A paramagnetic substance, in the form of a cube with sides 1 cm, has a magnetic dipole moment of 20 x 10\(^{-6}\) J/T, when a magnetic intensity of 60 x 10\(^3\) A/m is applied. Its magnetic susceptibility is
Estimate the surface area of a spherical nanoparticle with a diameter of 10 nm.
What is the primary mechanical advantage of cross-linked polymers over linear polymers?
Which of the following statements best describes the effect of increasing the temperature on the conductivity of an intrinsic semiconductor?
Which factor is most critical when selecting a matrix material for a high-temperature composite application?
Calculate the electrical conductivity of a copper wire if the number density of free electrons is 8.5x10\(^{28}\) electrons/m\(^3\) and the electron mobility is 0.0035 m\(^2\)/Vs.
Evaluate the potential benefits and drawbacks of using ceramic matrix composites (CMCs) in aerospace engine components.
Analyze the implications of using a hard magnetic material in the stator of an electric motor instead of a soft magnetic material.
Which factor most significantly influences the optical properties of a material such as refractive index and absorption of light?
Identify a bottom-up approach in nanotechnology:
Considering the unique properties of nano materials, evaluate their use in targeted drug delivery systems.
Design a study to test the effectiveness of different nano-material coatings to improve the wear resistance of industrial cutting tools. What would be a key variable to control?
Design an experiment to test the effectiveness of nanostructured coatings to improve the corrosion resistance of metals. What would be the primary performance metric to measure?
During an isothermal expansion, 2 moles of an ideal gas expand from 1 L to 3 L at a constant temperature of 300 K. Using R=8.314 J/mol.K calculate the work done by the gas.
During an isothermal expansion of an ideal gas, how does the entropy of the system change?
What does the Third Law of Thermodynamics state about the entropy of a perfect crystal at absolute zero temperature?
Which process involves an increase in enthalpy due to the system absorbing heat from the surroundings?
Calculate the increase in entropy when two identical containers, each containing 1 mole of an ideal gas at 300 K and 1 atm, are allowed to mix freely.
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A closed system undergoes a process resulting in a work output of 150 J while the heat removed from the system is 100 J. Calculate the change in internal energy of the system.
Consider the properties of ceramics. Which of the following is a reason for their brittleness?
An ideal gas is compressed adiabatically, where its initial volume of 3 liters is reduced to 1 liter. If the initial pressure was 1 atm and \(\gamma=5/3\), calculate the final pressure of the gas.
A Carnot engine operates between a hot reservoir at 500 K and a cold reservoir at 300 K. Calculate the efficiency of the engine.
A reaction's Gibbs free energy change (\(\Delta G\)) is found to be positive at 298 K but becomes negative at 350 K. What does this imply about the reaction?