GATE 2019: Fluid Mechanics Quiz 12

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Question 1

Which of the following device can transmit power without any change of torque.

• AFluid Coupling
• BHydraulic torque convertor
• CBoth of these
• DNone of these

Question 2

If a jet of water of area 3cm² strikes with a velocity of 10m/s in a series of flat plate wheel of mean diameter 15cm rotating at 70 rpm then force exerted per unit weight per sec ( N/ N/s) )will be equal to

• A94.5 
• B0.945 
• C9.45 
• D0.0954 

Question 3

A 60 mm-diameter water jet strikes a plate containing a hole of 40 mm diameter as shown in the figure. Part of the jet passes through the hole horizontally, and the remaining is deflected vertically. The density of water is 1000 kg/m³. If velocities are as indicated in the figure, the magnitude of horizontal force (in N) required to hold the plate is ______

• A625
• B628.32
• C630
• D636

Question 4

Which of the following types of pumps is suitable for pumping viscous fluids?

• ACentrifugal pump
• BReciprocating pump
• CAir lift pump
• DScrew pump

Question 5

A Francis turbine working at 400 rpm has a unit speed of 50 rpm and develops 500 kW of power.
What is the effective head under which this turbine operates?

• A62.5 m
• B64.0 m
• C40.0 m
• D100 m

Question 6

If in a pump, the discharge is halved, then assuming that the speed remains unchanged, what would be the ratio of the heads H₁/H₂?

• A
• B
• C
• D

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