1

GATE ME 1996

Subjective

+5

-0

In a hydroelectric station, water is available at the rate of $$175{m^3}/s$$ under a head of $$18m.$$ The turbines run at a speed of $$150$$ $$rpm$$ with overall efficiency of $$82\% $$. Find the number of turbines required if they have the maximum specific speed of $$460.$$

2

GATE ME 1992

Subjective

+5

-0

A Hydro turbine is required to give $$25$$ $$MW$$ at $$50$$ $$m$$ head and $$90$$ $$rpm$$ runner speed. The laboratory facilities available, permit testing of $$20$$ $$kW$$ models at $$5$$ $$m$$ head. What should be the model runner speed and model to prototype scale ratio?

3

GATE ME 1991

Subjective

+5

-0

A $$7MW$$ hydro turbine working under a head of $$10$$ $$m$$ at a rotational speed of $$125$$ $$rpm$$ is to be designed and developed by conducting model tests in a laboratory. Maximum possible discharge to the model is $$600$$ liters per second at a constant head of $$5m.$$ Determine the minimum scale of the model and its speed if the expected efficiency of the model is $$85\% .$$

4

GATE ME 1990

Subjective

+5

-0

Identify the type of turbo machinery for the following case. Specify the reasons.

Power developed $$=430$$ $$kW;$$

Operating head $$=300$$ $$m;$$

Speed $$=600$$ $$rpm.$$

Power developed $$=430$$ $$kW;$$

Operating head $$=300$$ $$m;$$

Speed $$=600$$ $$rpm.$$

Questions Asked from Turbo Machinery (Marks 5)

Number in Brackets after Paper Indicates No. of Questions

GATE ME Subjects

Engineering Mechanics

Machine Design

Strength of Materials

Heat Transfer

Production Engineering

Industrial Engineering

Turbo Machinery

Theory of Machines

Engineering Mathematics

Fluid Mechanics

Thermodynamics

General Aptitude