In a jacketed CSTR for an endothermic reaction, increasing the heat transfer area per unit volume of reactor primarily affects which parameter?

The correct answer is C: Reaction rate and operating temperature stability. Increased heat transfer area improves heat supply rate for endothermic reactions, allowing higher operating temperatures with better temperature control and stability.

The Nusselt number (Nu) relationship for laminar flow in a circular pipe is given by Nu = 3.66. What does this value represent?

The correct answer is B: The thermally developed laminar flow condition with constant wall temperature. The value of 3.66 is the fully developed Nusselt number for laminar flow in circular pipes under constant wall temperature (T_s constant) boundary condition, representing the thermal development region.

The Helmholtz free energy (A = U - TS) is the maximum useful work available at:

The correct answer is A: Constant temperature and volume. Helmholtz free energy is defined at constant T and V. ΔA_max = W_useful (non-PV work)

In a membrane reactor for an equilibrium-limited reaction, what is the primary advantage?

The correct answer is B: Selective removal of products shifts equilibrium forward, increasing conversion. By selectively removing product through the membrane, the equilibrium constant expression is displaced, allowing conversion beyond the thermodynamic limit.

In a continuous contacting device, the operating line is obtained from which fundamental principle?

The correct answer is A: Material balance equation. Operating line represents all possible compositions entering and leaving the device based on material balance: Y₁ - Y₂ = (L/V)(X₁ - X₂)

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Chemical Engineering
Fluid Mechanics

Process design, thermodynamics, reactions

33 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–20 of 33

Topics in Chemical Engineering

All Mass Transfer 100 Heat Transfer 100 Fluid Mechanics 100 Chemical Reaction Engineering 100 Thermodynamics 97

Q.11 Easy Fluid Mechanics

A centrifugal pump has an impeller diameter of 0.3 m rotating at 1500 RPM. Calculate the peripheral speed of the impeller tip.

A 23.56 m/s

B 47.12 m/s

C 94.25 m/s

D 11.78 m/s

Correct Answer: A. 23.56 m/s

EXPLANATION

Peripheral speed = πDN/60 = π × 0.3 × 1500/60 = 23.56 m/s

Test

Q.12 Easy Fluid Mechanics

In a horizontal pipe flow, the pressure drop increases with which of the following factors?

A Increase in pipe diameter

B Decrease in flow velocity

C Increase in pipe roughness

D Decrease in fluid density

Correct Answer: C. Increase in pipe roughness

EXPLANATION

Pressure drop (Δp) is proportional to friction factor which increases with pipe roughness. From Hagen-Poiseuille and Darcy equations, rougher pipes cause higher friction losses.

Test

Q.13 Easy Fluid Mechanics

Which of the following dimensionless numbers represents the ratio of inertial forces to viscous forces in fluid flow?

A Froude number

B Reynolds number

C Weber number

D Mach number

Correct Answer: B. Reynolds number

EXPLANATION

Reynolds number (Re) = inertial forces/viscous forces. It is the fundamental dimensionless number in fluid mechanics.

Test

Q.14 Easy Fluid Mechanics

A fluid flows through a circular pipe of diameter 50 mm at a velocity of 2 m/s. If the kinematic viscosity is 1×10⁻⁵ m²/s, calculate the Reynolds number and identify the flow regime.

A Re = 10,000 (Turbulent)

B Re = 1,00,000 (Turbulent)

C Re = 10,000 (Laminar)

D Re = 5,000 (Transition)

Correct Answer: A. Re = 10,000 (Turbulent)

EXPLANATION

Reynolds number = (ρVD)/μ = VD/ν = (2 × 0.05)/(1×10⁻⁵) = 10,000. Flow is turbulent for Re > 4,000.

Test

Q.15 Easy Fluid Mechanics

In a reciprocating pump with piston diameter D = 0.1 m and stroke length L = 0.2 m operating at 60 RPM, calculate the theoretical displacement per revolution.

A 0.00157 m³

B 0.00314 m³

C 0.00628 m³

D 0.01256 m³

Correct Answer: A. 0.00157 m³

EXPLANATION

Displacement = π/4 × D² × L = π/4 × (0.1)² × 0.2 = 0.00157 m³ per revolution

Test

Q.16 Easy Fluid Mechanics

Which dimensionless number characterizes the relative importance of inertial forces to viscous forces in fluid flow?

A Froude number

B Reynolds number

C Weber number

D Mach number

Correct Answer: B. Reynolds number

EXPLANATION

Reynolds number (Re = ρVD/μ) represents the ratio of inertial to viscous forces

Test

Q.17 Easy Fluid Mechanics

In laminar flow through a circular pipe, the velocity profile is parabolic. What is the ratio of average velocity to maximum velocity at the centerline?

A 0.25

B 0.5

C 0.75

D 1.0

Correct Answer: B. 0.5

EXPLANATION

For laminar flow in circular pipes, v_avg = v_max/2, so the ratio is 0.5

Test

Q.18 Easy Fluid Mechanics

A centrifugal pump operates with water (ρ = 1000 kg/m³) at an impeller diameter of 0.3 m and rotational speed of 1500 RPM. Calculate the peripheral velocity at the impeller tip.

A 23.56 m/s

B 15.71 m/s

C 31.42 m/s

D 47.12 m/s

Correct Answer: A. 23.56 m/s

EXPLANATION

Peripheral velocity = π × D × N / 60 = π × 0.3 × 1500 / 60 = 23.56 m/s

Test

Q.19 Easy Fluid Mechanics

The relative roughness of a pipe is defined as:

A Absolute roughness height only

B Ratio of absolute roughness to pipe diameter

C Product of roughness and pipe length

D Roughness divided by fluid viscosity

Correct Answer: B. Ratio of absolute roughness to pipe diameter

EXPLANATION

Relative roughness ε/D = (absolute roughness)/(pipe diameter). This dimensionless parameter determines flow behavior in the Moody chart for turbulent flow calculations.

Test

Q.20 Easy Fluid Mechanics

In a U-tube manometer measuring differential pressure, if one side contains mercury (ρ = 13600 kg/m³) with a height difference of 250 mm, what is the differential pressure?

A 32.4 kPa

B 33.3 kPa

C 34.2 kPa

D 35.1 kPa

Correct Answer: B. 33.3 kPa

EXPLANATION

ΔP = ρ_mercury × g × h = 13600 × 9.81 × 0.25 = 33,324 Pa ≈ 33.3 kPa

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