Hydraulics and fluid mechanics questions with answers
211 multiple-choice questions. Open any question for its answer and explanation.
- Coefficient of contraction for an external cylindrical mouthpiece is
- Surface energy per unit area of a surface is numerically equal to
- Specific weight of sea water is more that of pure water because it contains
- The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is
- A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is
- Flow at constant rate through a tapering pipe is i) steady flow ii) uniform flow iii) unsteady flow iv) non-uniform flow The correct answer is
- Drag force is a function of i) projected area of the body ii) mass density of the fluid iii) velocity of the body The correct answer is
- The increase in meta centric height i) increases stability ii) decreases stability iii) increases comfort for passengers iv) decreases comfort for passengers The correct answer is
- Select the correct statement
- Least possible value of correction factor for i) kinetic energy is zero ii) kinetic energy is 1 iii) momentum is zero iv) momentum is 1 The correct statements are
- Choose the wrong statement
- The flow which neglects changes in a transverse direction is known as
- For measuring flow by a venturimeter, if should be installed in
- Which of the following instrument can be used for measuring speed of an aeroplane
- A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
- For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be
- Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
- The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)
- The line of action of the buoyant force acts through the centroid of the
- Two pipe systems are said to be equivalent when
- A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ? A. 1 : 5 B. 1 : 2.5 C. 1 :25 D. 1:50
- A fluid is said to be ideal, if it is
- The horizontal component of force on a curved surface is equal to the
- Which of the following is used to measure the discharge ?
- Rotameter is a device used to measure