Mechanical Engineering MCQs

Page No. 166

Low specific speed of turbine implies it is__________________?


apropeller turbine


bFrancis turbine


cimpulse turbine


dany one of the above


View Answer impulse turbine

Runaway speed of a hydraulic turbine is_________________?


afull load speed


bthe speed at which turbine runner will be damaged


cthe speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open


dthe speed corresponding to maximum overload permissible



Medium specific speea of turbine implies it is___________________?


apropeller turbine


bFrancis turbine


cimpulse turbine


dany one of the above


View Answer Francis turbine

The specific speed of turbine is defined as the speed of a unit___________________?


aof such a size that it delivers unit dis-charge at unit head


bof such a size that it delivers unit dis-charge at unit power


cof such a size that it requires unit power per unit head


dof such a size that it produces unit horse power with unit head



A turbine pump is basically a centrifugal pump equipped additionally with_________________?


aadjustable blades


bbackward curved blades


cvaned diffusion casing


dinlet guide blades



In reaction turbine, draft tube is used_____________________?


ato transport water downstream without eddies


bto convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section


cfor safety of turbine


dto increase flow rate



Impulse turbine is generally fitted______________________?


aat the level of tail race


blittle above the tail race


cslightly below the tail race


dabout 2.5 m above the tail race to avoid cavitation



Francis turbine is best suited for_____________________?


amedium head application from 24 to 180 m


blow head installation up to 30 m


chigh head installation above 180 m


dall types of heads



Francis, Kaplan and propeller turbines fall under the category of___________________?


aImpulse turbines


bReaction turbines


cAxial flow turbines


dMixed flow turbines


View Answer Reaction turbines

The discharge through a reaction turbine with increase in unit speed____________________?


aincreases


bdecreases


cremains unaffected


dfirst increases and then decreases


View Answer decreases

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