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ESE CE: Hydraulics Champion Quiz 5

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Question 1

A turbine develops 7000kW power under a head of 25 m at 145 rpm. Calculate the specific speed of turbine and state the type of turbine.

Question 2

A penstock is 2000 m long and the velocity of pressure wave in it is 1000 m/s. Water hammer pressure head for instantaneous closure of valve at the downstream end of the pipe is 60 m. If the valve is closed in 4 s, then what is the peak water hammer pressure in m of water?

Question 3

Assume that water vaporizes at an absolute pressure of 1.5 m, barometric pressure head is 9.5 m, cavitation coefficient is 0.1. A turbine operates under a head of 40 m. The safe height of the runner above the tail water level, in meters, is

Question 4

Statement (I): In Impulse turbines pressure change occurs only in the nozzles of the machine.
The pressure of liquid does not change while flowing through the rotor of the machine.
Statement (II): The pressure of liquid changes while it flows through the rotor of the machine in Reaction turbine.

Question 5

Consider the following statements regarding a draft tube used in water turbines:
1) It reduces the discharge velocity of water to minimize the loss of kinetic energy at the outlet.
2) It permits the turbine to be set above the ta1 race without any appreciable drop in available head.
3) It is used in both impulse and reaction type of water turbines.
Which of these statements is/are correct?

Question 6

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?

Question 7

A turbine discharging 10 m3/s is to be designed so that a torque of 1600 kg-m is to be exerted on the impeller turning at 200 rpm under the condition that the exiting liquid exerts no moment in spite of its momentum. The tangential component of the velocity at the outer periphery of the impeller of radius 1.0 m is

Question 8

Match List-I (Dimensionless number) with List-II (Nature of forces involved) and select the correct answer using the codes given below the lists :
List-I
A) Euler number
B) Weber number
C) Mach number
D) Frounde number
List-II
1) Surface tension
2) Gravity
3) Pressure
4) Elastic

Question 9

A hydraulic turbine develops 1000kW power for a head of 40m. If the head is reduced to 20m, the power developed (in kW) is ______.

Question 10

In a steady flow through a nozzle, the flow velocity on the nozzle axis is given by , where x is the distance along the axis of the nozzle from its inlet plane and L is the length of the nozzle. The time required for a fluid particle on the axis to travel from the inlet to the exit lane of the nozzle is
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Jun 17ESE & GATE CE