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ESE CE Hydraulics: National Champion Test

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Question 1

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 2

A turbine is working under a head of 200m. The power developed by the turbine is 100 kW and discharge through the turbine is 0.125 m3/s. In such case, the ratio of unit power to unit discharge for the turbine will be

Question 3

Assertion (A): Runaway speed of a turbine is the speed under maximum head at full gate opening when the load is disconnected suddenly.
Reason (R): The various rotating components of the turbine are designed to remain safe at the runaway speed.

Question 4

A Pelton wheel with single jet rotates at 600 rpm. The velocity of the jet from the nozzle is 100 m/s. If the ratio of the vane velocity to jet velocity is 0.44, what is the diameter of the Pelton wheel?

Question 5

A forebay in hydel system is provided at the junction of

Question 6

The specific speed of a hydraulic turbine depends upon

Question 7

Which of the following water turbines maintain a high efficiency over a long range of the part load?
1) Francis turbine
2) Kaplan turbine
3) Pelton turbine
4) Propeller turbine
Select the correct answer using the codes given below:

Question 8

consider the following statements:
In reciprocating pumps, the air vessels are used
1) to get continuous supply of liquid at a uniform rate.
2) to save the power required to drive the pump.
3) to run at much higher speed without any danger of separation.
Which of these statements are correct?

Question 9

Given below are two lists. Which of these are properly matched?

Question 10

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 11

A smooth pipe of diameter 200mm carries water. The pressure in the pipe at section S1 (elevation: 10m) is 50kPa. At Section S2 (elevation: 12m) the pressure is 20kPa and velocity is 2ms-1. Density of water is 1000kgm-3 and acceleration due to gravity is 9.8ms-2. Which of the following is TRUE?

Question 12

A centrifugal pump has an efficiency of 80%. The specifications of the pump are: discharge = 70m3/hr, Head = 7m, speed = 1450 rpm and diameter = 200mm. If the speed of this pump is increased to 1750 rpm, calculate the discharge, head developed and power input required at this speed without loss in efficiency.Density of water= 998 kg/m3.

Question 13

Water flows through a 10 mm diameter and 250 m long smooth pipe at an average velocity of 0.1 m/s. The density and the viscosity of water are 997 kg/m3 and 855 x 10-6 Ns/m2 respectively. Assuming fully-developed flow, the pressure drop (in Pa) in the pipe is _______.

Question 14

Assertion (A): Stability of a floating body is determined by the relative position of the centre of gravity and the centre of buoyancy.
Reason (R): If metacentre of the floating body is above the centre of gravity of the body, then the floating body will be in stable equilibrium.

Question 15

A body weighs 30 N and 15 N when weighed under submerged conditions in liquids of relative densities 0.8 and 1.2 respectively. What is the volume of the body in litres ________?

Question 16

Air vessel are used in reciprocating pumps in order to __________.

Question 17

What is the depth of centre of pressure of a vertical immersed surface from free surface of liquid equal to?

Question 18

Statement (I) : The coefficient of discharge for a mouthpiece is higher than of an orifice.
Statement (II) : The discharge through an orifice varies as H1/2 whereas the discharge through a mouthpiece varies as H2/3 (where H is the head causing the flow in both cases).

Question 19

The discharge, over a rectangular weir of width 100 m when the head of water over te weir is 1.5 m and the head due to velocity of approach is 0.02 m, is given by

Question 20

A right-angled triangular channel symmetrical in section about the vertical carries a discharge of 5 m3/s with a velocity of 1.25 m/s. What is the approximate value of the Froude number of the flow?
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Mar 8ESE & GATE CE