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Mechanical Engineering Objective Questions { Hydraulic Machines }



57. Specific speed of turbine is indicated as
A.N√Q/ H^(3/4)
B.N√P/ H^(5/4)
C.N√Q/ H^(2/3)
D.N√P/ H^(3/2)
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58. An impulse turbine
A.Operates submerged
B.Requires draft tube
C.Is most suited for low head applications
D.Operates by initial complete conversion to kinetic energy
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59. A Pelton wheel is
A.Axial flow impulse turbine
B.Radial flow impulse turbine
C.Inward flow impulse turbine
D.Outward flow impulse turbine
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60. Felton wheels are used for minimum of following heads
A.20 m
B.100 m
C.125 rn
D.180 m or above
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61. The ratio of width of bucket for a Pelton wheel to the diameter of jet is of the order of
A.2
B.3
C.4
D.5
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62. The ratio of depth of bucket for a Pelton wheel to the diameter of jet is of the order of
A.1
B.1.2
C.1.5
D.1.8
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63. The maximum efficiency of a Pelton wheel working under a constant head and discharge with the increase in power
A.Increases
B.Decreases
C.Remains unaffected
D.Initially increases and then decreases
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