Basic Aerodynamics Question & Answer
Here we added basic aerodynamics and fluid mechanics questions. Here question type are MCQ's MSQ's & NAT's questions ask in many different exam like GATE, HAL, ISRO & Technical exams etc. We have collect some types of pattern based question collect for practice. Here we will be learn about basic aerodynamics and fluid mechanics questions.
We hope these problems are helpful for you. For more questions stay with us.
1. The figure shows the developing zone and the fully developed region in a pipe flow where the steady flow takes place from left to right. The wall shear stress in the sections A, B, C, and D are given by 𝜏Æ, 𝜏B, 𝜏C, and 𝜏D, respectively. Select the correct statement. [MCQ]
- A) 𝜏Æ > 𝜏B
B) 𝜏C > 𝜏D
C) 𝜏B > 𝜏Æ
D) 𝜏C > 𝜏B
2.The left hand column lists some non-dimensional numbers and the right hand column lists some physical phenomena. Indicate the correct combination [MCQ]
1. Reynolds number | i. Wave drag |
2. Froude number | ii. Compressible flow |
3. Mach number | iii. Viscous drag |
4. Weber number | iv. Spray formation |
- A) 1-iii, 2-i, 3-ii, 4-iv
B) 1-i, 2-ii, 3-iv, 4-iii
C) 1-iv, 2-iii, 3-iv, 4-iii
D) 1
3. As temperature increases [MSQ]
- A) the dynamic viscosity of a gas increases.
B) the dynamic viscosity of a liquid decreases.
C) the dynamic viscosity of a liquid does not change.
D)
4. Which of the following statement(s) regarding a venturimeter is/are correct? [MSQ]
- A) In the direction of flow, it consists of a converging section, a throat, and a diverging section.
B) In the direction of flow, it consists of a diverging section, a throat, and a converging section.
C) It is used for flow measurement at a very low Reynolds number.
D)
5.Which of the following statement(s) is/are true for streamlines in a steady incompressible flow? [MSQ]
- A) Two streamlines cannot intersect each other.
B) Flow rate increases between two diverging streamlines.
C) Flow rate decreases between two diverging streamlines.
D)
6. A flow has a velocity potential given by 𝜙 = 𝐴𝑥3 where ‘A’ is a non-zero constant. Which of the following statement(s) is/are true about the flow? [MSQ]
- A) The flow is incompressible.
B) The flow is irrotational.
C)
D)
7. A boundary layer develops due to a two- dimensional steady flow over a horizontal flat plate. Consider a vertical line away from the leading edge which extends from the wall to the edge of the boundary layer. Which of the following quantity/quantities is/are not constant along the vertical line? 𝑢 and 𝑣 represent the components of velocity in the direction along the plate and normal to it, respectively and x is taken along the length of the plate while p is the pressure. (Neglect body forces.) [MSQ]
- A) 𝑢
B) 𝜕𝑢/𝜕𝑥
C) 𝑣
D)
8. The speed of propagation, c, of a capillary wave depends on the density of the fluid, r, the wavelength of the wave, λ, and the surface tension, σ. If the density and wavelength remain constant, halving the surface tension would lead to a new velocity, c', given by [MCQ]
- A) c' = 2c
B) c' = √2c
C)
D)
9. A two-dimensional flow field is described by a combination of a source of strength m at the origin and a uniform flow, U, in the positive x-direction such that the velocity potential is given by f = Ux + m/4p ln(x2 + y 2) The stagnation streamline is shown in the figure. Find the distance aa¢ . [MCQ]
- A)
B)
C)
D)
10. A typical boundary layer over a flat plate has a linear velocity profile with zero velocity at the wall and freestream velocity, U∞, at the outer edge of the boundary layer. What is the ratio of the momentum thickness to the thickness of the boundary layer? [MCQ]
11. Identify the configuration(s) in which steady two-dimensional internal flow may show boundary layer separation if the flow direction is left to right. [MSQ]
A) 
B) 
C)
D) 
12. Consider steady fully developed flow of a liquid through two large horizontal flat parallel plates separated by a distance of 2 mm. One of the plate is fixed and the other plate moves at a speed of 0.5 m/s. What is the magnitude of the pressure gradient (in Pa/m) in the direction of the flow required to ensure that the net flow through the plates is zero? Dynamic viscosity of the liquid is 5x10-4 Ns/m2
(Round off to the nearest integer) [NAT]
13. For an inviscid fluid with density 1 kg/m3, the Cartesian velocity field is given as:
𝐮 = (—2𝑥 + 𝑦)𝑡𝐢 + (2𝑥 + 𝑦)𝑡𝐣 m/s Neglecting the body forces, find the magnitude of pressure gradient in (Pa/m) at (x, y) = (1 , 1) at t = 1 s. (Round off to two decimal places) [NAT]
14. A wooden cylinder (specific gravity = 0.6) of length L and diameter D floats in water (density 1000 kg/m3). Find out the minimum value of D/L for which the cylinder floats with its axis vertical. (Round off to three decimal places) [NAT]