Free Printable Rotor Dynamics Quiz

Worksheets

Name

Class

Date

Which one of the following correctly expresses the specific speed of a turbine and a pump, respectively?

NQ^1/2/H^3/4, NP^1/2/H^5/4

NP^1/2/H^3/4, NQ^1/2/H^5/4

NP^1/2/H^5/4, NQ^1/2/H^3/4

NP^1/2/H^7/4, NQ^1/2/H^3/4

Range of specific speed for Pelton wheel Double Jet is

3 to 30

30 to 60

60 to 300

300 to 1000

In the case of Francis turbine, velocity ratio is defined as V3/(2 gH)^0.5 where H is the available head and V3 is the

absolute velocity at the draft tube inlet

mean velocity of flow in the turbine

absolute velocity at the guide vane inlet

flow velocity at the rotor inlet

When R = 0.5, the conditions are

Vr1 = Vr2

V1 = Vr2, V2 = Vr1

V1= V2

V2 > V1

Under Maximum Utilization factor what conditions comes into picture

V_r2 = V_f2, β2 = 90^ο , U₂ = V_w2

V₂= V_f2, α₂ = 0^ο, V_w2 = 0

V_r2 = V₂, β₂ = α₂, U₂ = 0

V₂= V_f2, α₂ = 90^ο, V_w2 = 0

100 %

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