Mechanical Engineering - MCQ Practice Questions

Which of the following is an intensive property in thermodynamics?

The First Law of Thermodynamics is a statement of conservation of:

For an ideal gas undergoing an isothermal process, the change in internal energy is:

The entropy of a reversible adiabatic process is:

Which process requires zero work to be done by the system?

A heat engine operating between two temperature reservoirs has a maximum theoretical efficiency given by:

In a throttling process (Joule-Thomson expansion), the enthalpy of the fluid:

The availability or exergy of a system is zero when the system is in:

For a real gas, the compressibility factor Z is defined as:

The polytropic process for an ideal gas follows PV^n = constant. When n = 0, the process is:

In a closed system, the total energy balance equation for a time interval is:

Two bodies at different temperatures are brought into contact in an isolated system. The total entropy of the system will:

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

In a vapour compression refrigeration cycle, the throttling device (expansion valve) causes:

A Carnot refrigerator operates between T_H = 300 K and T_C = 250 K. Its coefficient of performance (COP) is:

The Clausius-Clapeyron equation relates vapor pressure to:

For a system undergoing a reversible process from state 1 to state 2, which statement is true?

In a turbojet engine operating on a Brayton cycle, if the pressure ratio r_p increases, the thermal efficiency:

Maxwell relations are derived from the equality of:

In an Otto cycle engine with compression ratio r = 9 and γ = 1.4, the thermal efficiency is approximately: