Mechanical Engineering - MCQ Practice Questions

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)?

Bernoulli's equation applies to:

A pump delivers 0.05 m³/s of water. If the pipe diameter is 0.1 m, the velocity of flow is:

The Darcy friction factor for fully developed laminar flow in a pipe depends on:

Water flows through a horizontal pipe with diameter 0.05 m at a velocity of 2 m/s. The volumetric flow rate is:

The Mach number is the ratio of:

For turbulent flow in pipes, the Colebrook-White equation is used to find the friction factor. Which of the following is NOT an input parameter?

Water at 20°C flows through a pipe network. The dynamic viscosity of water at 20°C is approximately:

A fluid element has shear stress τ = 0.5 Pa and velocity gradient du/dy = 10 s⁻¹. The dynamic viscosity of the fluid is:

The Reynolds number for flow in a circular pipe is given by Re = ρVD/μ. If the flow transitions from laminar to turbulent at Re ≈ 2300, then for a pipe with D = 0.025 m and V = 1.5 m/s (ρ = 1000 kg/m³, μ = 0.001 N·s/m²), the flow regime is:

Which of the following is a dimensionless number used in fluid mechanics that compares inertial forces to surface tension forces?

A horizontal pipe carries water at steady state. At section 1: P₁ = 200 kPa, V₁ = 3 m/s. At section 2: V₂ = 6 m/s. Assuming ideal incompressible flow and neglecting friction, the pressure at section 2 is:

In a converging nozzle, as the cross-sectional area decreases, the velocity of incompressible flow:

The Strouhal number is used to characterize:

A venturi meter is used to measure fluid flow rate. The principle it operates on is:

For compressible flow through a convergent nozzle, chocking occurs when:

The major loss in pipe flow (Darcy-Weisbach equation: hf = f(L/D)(V²/2g)) is primarily due to: