Fundamentals of Engineering Fluid Mechanics and Thermodynamics 3

Question 1

What is the specific heat ratio (γ = Cp/Cv) for a diatomic ideal gas at standard conditions?

Accepted Answer

1.4

Answer

1.67

Answer

1.0

Answer

1.2

Question 2

Which dimensionless number characterizes the ratio of convective to conductive heat transfer?

Accepted Answer

Nusselt number

Answer

Prandtl number

Answer

Reynolds number

Answer

Grashof number

Question 3

In pipe flow, what Reynolds number approximately marks the transition from laminar to turbulent flow?

Accepted Answer

~2,300

Answer

~500

Answer

~10,000

Answer

~100

Question 4

What is the thermodynamic process called when pressure remains constant?

Accepted Answer

Isobaric process

Answer

Isothermal process

Answer

Isochoric process

Answer

Adiabatic process

Question 5

Stagnation pressure in compressible flow is the pressure measured at a point where:

Accepted Answer

The flow velocity is reduced to zero isentropically

Answer

The flow is fully turbulent

Answer

The temperature is at a maximum

Answer

The density is at atmospheric value

Question 6

What is the Prandtl number (Pr) for a fluid?

Accepted Answer

The ratio of momentum diffusivity to thermal diffusivity (Pr = μCp/k)

Answer

The ratio of inertial to viscous forces

Answer

The ratio of buoyancy to viscous forces

Answer

The ratio of convective to conductive heat transfer