Gate Exam Category

In a Francis turbine runner, the number of blades are generally between

A. 2 to 4
B. 4 to 8
C. 8 to l6
D. 16 to 24

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Gate Other Question

A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

A. 0.26
B. 0.36
C. 0, 46
D. 0.56

The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) ) is

A. ηh = ηo x ηm
B. ηm = ηo x ηh
C. ηo = ηh x ηm
D. none of these