Mechanical Engineering - Hydraulic Machines

Exercise : Hydraulic Machines - Section 4
1.
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
delivers unit discharge under unit head
delivers unit discharge under unit speed
develops unit power under unit head
develops unit power under unit speed
Answer: Option
Explanation:
No answer description is available. Let's discuss.

2.
The runaway speed of a hydraulic turbine is the speed
at full load
at which there will be no damage to the runner
corresponding to maximum overload permissible
at which the turbine will run freely without load
Answer: Option
Explanation:
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3.
The cavitation in a hydraulic machine
causes noise and vibration of various parts
reduces the discharge of a turbine
causes sudden drop in power output and efficiency
all of the above
Answer: Option
Explanation:
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4.
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
slow speed pump with radial flow at outlet
medium speed pump with radial flow at outlet
high speed pump with radial flow at outlet
high speed pump with axial flow at outlet
Answer: Option
Explanation:
No answer description is available. Let's discuss.

5.
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
no flow will take place
cavitation will be formed
efficiency will be low
excessive power will be consumed
Answer: Option
Explanation:
No answer description is available. Let's discuss.