ME or MEng Master of Engineering Thermodynamics and Heat Transfer

Question 1

Which thermodynamic cycle is the theoretical standard for spark-ignition gasoline engines?

Accepted Answer

Otto cycle

Answer

Diesel cycle

Answer

Brayton cycle

Answer

Rankine cycle

Question 2

What does the Clausius inequality state about a thermodynamic cycle?

Accepted Answer

The cyclic integral of dQ/T is less than or equal to zero

Answer

The net work output equals heat absorbed

Answer

Entropy decreases in all real cycles

Answer

Heat always flows from cold to hot reservoirs

Question 3

In a heat exchanger, the LMTD method stands for:

Accepted Answer

Logarithmic Mean Temperature Difference

Answer

Linear Mean Thermal Distribution

Answer

Latent Mean Transfer Differential

Answer

Lateral Momentum Transfer Derivative

Question 4

The thermal efficiency of a Carnot heat engine operating between 600 K (hot) and 300 K (cold) is:

Accepted Answer

50%

Answer

25%

Answer

33%

Answer

75%

Question 5

Fourier's Law of heat conduction relates heat flux to:

Accepted Answer

The negative of the temperature gradient

Answer

The cube of the temperature gradient

Answer

The square root of the temperature gradient

Answer

The absolute temperature of the material

Question 6

Which dimensionless number is used in convective heat transfer to relate inertial forces to viscous forces in a fluid?

Accepted Answer

Reynolds number

Answer

Nusselt number

Answer

Prandtl number

Answer

Biot number