Mechanical Engineering - MCQ Practice Questions

A reversible isothermal process occurs at 300 K for an ideal gas. If 5 kJ of heat is absorbed, what is the change in entropy of the system?

Which of the following is NOT a state function in thermodynamics?

The specific heat capacity at constant volume (Cv) for a monoatomic ideal gas is:

A carnot engine operates between 600 K and 300 K. The maximum possible efficiency is:

A substance has a critical temperature Tc=647 K and critical pressure Pc=22.1 MPa. This is most likely:

The enthalpy of vaporization (latent heat) of water at 100°C is 2257 kJ/kg. This represents:

The relationship between specific heats Cp - Cv for an ideal gas is:

Which of the following statements about entropy is INCORRECT?

A heat engine operates between two thermal reservoirs at temperatures 600 K and 300 K. What is the maximum possible efficiency of this engine?

In a Diesel cycle, which process represents constant pressure heat addition?

In a constant volume process (isochoric), if temperature increases from 300 K to 600 K, the pressure ratio P₂/P₁ will be:

Which law states that the total energy of an isolated system remains constant?

Which process is represented when a gas is compressed without any heat transfer to or from surroundings?

For an ideal gas, if both pressure and volume are doubled, the temperature ratio T₂/T₁ will be:

In a closed system, 50 kJ of heat is added and 30 kJ of work is done by the system. The change in internal energy is:

According to the Second Law of Thermodynamics, for a spontaneous process in an isolated system, the entropy must:

The unit of kinematic viscosity in SI system is:

Which of the following statements about streamline flow is correct?

The continuity equation for incompressible flow states that:

What is the dimension of pressure coefficient (Cₚ)?