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ESE ME 2018 Achiever Study Plan: Fluid Mechanics Quiz 5

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Question 1

The thickness of the boundary layer for a fluid flowing over a flat plate at a point 20 cm from the leading edge is found to be 4 mm. The Reynolds number at the point (adopting 5 as the relevant constant) is:

Question 2

The function of which of the following hydraulic devices is analogous to that of the flywheel of a reciprocating engine and an electric storage battery?

Question 3

The specific speed

for a double suction pump is to be evaluated. The discharge would be taken as

Question 4

For a given centrifugal pump,

Question 5

Formation and collapse of vapour bubbles are believed to be the root cause for cavitations in hydraulic turbines. Most favourable condition for the formation of bubbles is set in the turbines a

Question 6

The Overall efficiency of a Pelton turbine is 70%. If the mechanical efficiency is 85%, what is its hydraulic efficiency?

Question 7

In a fluid machine, the relevant parameters are volume flow rate, density, viscosity,bulk modulus, pressure difference, power consumption, rotational speed and characteristics dimension. Using the Buckingham pi (

) therorem, the number of independent non- dimensional groups is _______.

Question 8

In similitude with gravity force, where equality of Froude number exists, the velocity ratio becomes

Question 9

The time period of a simple pendulum depends on its effective length L and the local asseleration due to gravity g. What is the number of dimensionless parameter involved?

Question 10

Statement (I): Radial-flow machines are used mainly for pumps where multi-staging will be useful to increase the delivery head.
Statement (II): Axial-flow pumps are useful where the head is low and discharge is large.

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ESE & GATE ME Fluid Mechanics & Machinery

Jul 23ESE & GATE ME