Time Left - 25:00 mins

GATE ME 2019: Fluid Mechanics Rapid Revision Quiz

Attempt now to get your rank among 778 students!

Question 1

A Jet of water of diameter 60 mm moving with a velocity of 50 m/s, strikes a curved fixed symmetrical plate at the centre. The force exerted by the Jet of water in the direction of Jet, if Jet is deflected through an angle of 120 ° at outlet of curved plate is ___.

Question 2

Air flows over a flat plate (1 m long) at a velocity of 6 m/s Boundary layer thickness at middle of plate is_______ mm. Take Kinematic Viscosity of air as 0.15 stokes.

Question 3

Displacement thickness in a flow governed by is 0.25δ. The value of n is __.

Question 4

Consider a very small fluid element that is moving in a flow field as shown in fig. The fluid has normal and shear stresses as it is in motion. If shear stress on one of its face decreases, the fluid element will;

Question 5

A centrifugal pump driven by 6 kliowatt motor at 2650 rpm, is to be connected to another motor at 3600 rpm. The power (kilowatt) of the motor should be

Question 6

For air flow over a flat plate, velocity (U) and boundary layer thickness (δ) can be expressed respectively, as
Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE ME 18-Mar\GATE-ME-2004_files\image204.png
If the free stream velocity is 2m/s, and air has kinematic viscosity of 1.5×10-5 m2/s and density of 1.23 kg/m3, the wall shear stress at x = 1m, is

Question 7

A fluid of dynamic viscosity 2 × 10-5kg/m.s and density 1 kg/m3 flows with an average velocity of 1 m/s through a long duct of rectangular (25 mm x 15 mm) cross-section. Assuming laminar flow, the pressure drop (in Pa) in the fully developed region per meter length of the duct is ________

Question 8

A 1 : 10 spilway model has a discharge of 1.5 m3/s. if a flood phenomenon takes 15 hours to occur in the prototype. The time it will take in the model is ________ hours.

Question 9

Water (p = 1000 kg/m3) flows horizontally through a nozzle into the atmosphere under the conditions given below. (assume steady state flow).

At inlet: A1 = 10–3m2; V1 = 2m/sec; P1 = 3 × 105 Pa (gauge)
At outlet: A1 = 10–4 m2; P2 = Patm
Determine the external horizontal force needed to keep the nozzle in place.

Question 10

Consider the following statements:
1- A streamline is a curve drawn in space, which is tangent everywhere to the velocity vector.
2- No fluid may enter or leave a stream tube excepts through its ends.
3- A path line refers to the identity of a fluid particle.
4- For a streak-line analysis,a fixed point should be under consideration.
Which of the above are correct?

Question 11

A model of a hydraulic turbine is tested at a head of 1/4th of that under which the full scale turbine works. The diameter of the model is half of that of the full scale turbine. If N is the RPM of the full scale turbine, then the RPM of the model will be

Question 12

A U-tube manometer with a small quantity of mercury is used to measure the static pressure difference between two locations A and B in a conical section through which an incompressible fluid flows. At a particular flow rate, the mercury column appears as shown in the figure. The density of mercury is 13600 kg/m3 and g=9.81 m/s2. Which of the following is correct?
Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE ME 18-Mar\GATE-ME-2005_files\image164.jpg

Question 13

A Prandtl tube (Pitot-static tube with Cv=1) is used to measure the velocity of water. The differential manometer reading is 10 mm of liquid column with a relative density of 10. Assuming g = 9.8 m/s2, the velocity or water (in m/s) is ________.

Question 14

Semi-circular plane hydraulic gate AB is hinged along B and held by horizontal force applied at A. The liquid to the left of the gate is water. The force required for equilibrium is ________ kN.
29opp.jpg

Question 15

In a flow of an ideal fluid, for the two given points at the same horizontal level, the difference in the pressure is 100 times the specific weight of the fluid. If the ratio of velocities at the two point is and lower velocity is 10 m/s, then will be ____.
[Assume no losses]
  • 778 attempts
  • 4 upvotes
  • 2 comments
Apr 23ESE & GATE ME