List of top Thermodynamics and Marine Engineering Questions asked in GATE NM

An air standard Otto cycle has a compression ratio of 6 and a mean effective pressure of 1000 kPa. Assume that the specific heat ratio \(\gamma\) is 1.4 and specific gas constant \(R\) as 0.287 kJ/kgK for the air. If the pressure and temperature at the beginning of the compression stroke are 100 kPa and 300 K, respectively, then the specific work output of the cycle is ________________ kJ/kg (rounded off to one decimal place).
If methane (CH\(_4\)) gas reacts with air at a stoichiometric proportion, then the air–fuel ratio of the combustion process is ________________ (rounded off to one decimal place).
For an Otto cycle with compression ratio $r$ and specific heat ratio $\gamma$, which expression represents the thermal efficiency?
For a simple vapour compression refrigeration, which of the following thermodynamic cycles (1-2-3-4) are possible? Here, \( T \), \( P \), \( S \), and \( h \) indicate temperature, pressure, specific entropy, and specific enthalpy, respectively.
If $\Delta h_m$ and $\Delta h_f$ are the enthalpy drops across the moving and fixed blades of a turbine stage, then the degree of reaction is
In an internal combustion engine, supercharging is the process of supplying intake air at a pressure
The most desirable property amongst the following for a lubricating oil is:
If $\dfrac{a_0}{2} + \sum_{n=1}^{\infty} a_n \cos(nx)$ is the Fourier cosine series of the function $f(x)=\sin x,\; 0<x<\pi$, then which of the following are TRUE?