Chemical Engineering - MCQ Practice Questions
Chemical Engineering questions for GATE and PSU exams are built on a handful of core subjects applied in many ways. Practice spans fluid mechanics, heat transfer, mass transfer, chemical reaction engineering, thermodynamics, process control and instrumentation, and plant design economics. Numerical solutions carry the assumptions written out, because the assumption is usually what separates a correct answer from a plausible one.
547 questions | 100% Free
In turbulent flow through a pipe, the friction factor can be estimated using the Colebrook-White equation. For smooth pipes at high Reynolds numbers, which equation applies?
A fluid flows through a sudden expansion from pipe diameter D₁ = 0.05 m to D₂ = 0.1 m with velocity V₁ = 4 m/s. Calculate the pressure recovery coefficient (Cp) for the expansion.
In an orifice meter with diameter ratio β = 0.6, what is the typical discharge coefficient (Cd) used for flow calculations?
A rotameter (variable area flowmeter) is used for gas flow measurement. The float rise in the tube depends on which factor?
For compressible isothermal flow through a horizontal pipe, which statement is correct?
Which of the following conditions must be satisfied for cavitation to occur in a centrifugal pump?
In open channel flow, the Froude number is defined as Fr = V/√(gD_h), where D_h is the hydraulic depth. When Fr = 1, the flow is classified as:
For flow measurement in a Venturi tube with diameter ratio (D₁/D₂) = 2, what is the diameter ratio for minimum vibration and noise?
A fluid with kinematic viscosity ν = 2×10⁻⁵ m²/s flows over a flat plate at velocity V = 10 m/s. At what plate length does transition from laminar to turbulent flow occur (Re_critical ≈ 5×10⁵)?
In a settling tank (clarifier) with depth H = 2 m, overflow rate = 1 m³/m²·h, and settling velocity of particles = 0.02 m/min, will the particles settle completely?
For a centrifugal pump, cavitation can be prevented by maintaining NPSH above the required value. In 2024-25 industrial practice, what is the typical margin kept above calculated NPSH_required?
A submersed weir has crest length L = 1.5 m and head H = 0.6 m. Using Francis formula for suppressed weir (Q = 1.84 LH^1.5), calculate discharge.
For laminar flow in a circular pipe, the velocity profile is parabolic. What is the relationship between maximum velocity (V_max) and average velocity (V_avg)?
A pitot tube is used for velocity measurement. If the stagnation pressure is 101.5 kPa and static pressure is 100.2 kPa, calculate the fluid velocity (ρ = 1.2 kg/m³).
In a pump, the head developed is 50 m and flow rate is 100 L/s. Calculate the hydraulic power. (Take g = 9.81 m/s²)
For a turbulent pipe flow with friction factor f = 0.032, pipe diameter D = 0.1 m, and velocity V = 3 m/s over length L = 50 m, calculate pressure drop using Darcy-Weisbach equation.
A boundary layer develops on a flat plate immersed in a flowing fluid. Which of the following correctly describes boundary layer separation?
For an open channel with trapezoidal cross-section, which parameter is used to determine the wetted perimeter?
A sharp-crested weir has a crest length of 2.0 m. If the head over weir is 0.4 m, calculate the discharge using Francis formula. (Use C_d = 0.623)
The Blasius equation for friction factor in turbulent flow is valid for: