Mechanical Engineering MCQs [Set 4]

31. High specific speed of turbine implies it is
(a) propeller turbine
(b) Francis turbine
(c) impulse turbine
(d) any one of the above
(e) none of the above.

32. The specific speed of turbine is defined as the speed of a unit
(a) of such a size that it delivers unit dis-charge at unit head
(b) of such a size that it delivers unit dis-charge at unit power
(c) of such a size that it requires unit power per unit head
(d) of such a size that it produces unit horse power with unit head
(e) none of the above.

33. Puck up the wrong statement about centrifugal pump
(a) discharge a diameter
(b) head a speed2
(c) head a diameter
(d) Power a speed3
(e) none of the above is wrong.

34. A turbine pump is basically a centrifugal pump equipped additionally with
(a) adjustable blades
(b) backward curved blades
(c) vaned diffusion casing
(d) inlet guide blades
(e) totally submerged operation facility.

35. Casting of a centrifugal pump is designed so as to minimize
(a) friction loss
(b) cavitation
(c) static head
(d) loss of kinetic energy
(e) starting time.

36. In reaction turbine, draft tube is used
(a) to transport water downstream without eddies
(b) to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
(c) for safety of turbine
(d) to increase flow rate
(e) none of the above.

37. Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between
(a) lift and resultant force
(b) drag and resultant force
(c) lift and tangential force
(d) lift and drag
(e) resultant force and tangential force.

38. Francis turbine is best suited for
(a) medium head application from 24 to 180 m
(b) low head installation up to 30 m
(c) high head installation above 180 m
(d) all types of heads
(e) none of the above.

39. The flow rate in gear pump
(a) increases with increase in pressure
(b) decreases with increase in pressure
(c) more or less remains constant with in-crease in pressure
(d) unpredictable
(e) none of the above.

40. Impulse turbine is generally fitted
(a) at the level of tail race
(b) little above the tail race
(c) slightly below the tail race
(d) about 2.5 m above the tail race to avoid cavitation

Updated: 30th June 2019 — 8:59 PM

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