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41. The maximum number of jets generally employed in impulse turbine without jet interference is________________?

A. 4
B. 6
C. 8
D. 12
E. 16.

42. 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

43. 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

44. 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

45. 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

46. Reaction turbines are used for____________________?

A. low head
B. high head
C. high head and low discharge
D. high head and high discharge
E. low head and high discharge

47. The angle of taper on draft tube is A. greater than 15° B. greater than 8° C. greater than 5° D. less than 8° E. less than 3°.___________________?

The angle of taper on draft tube is
A. greater than 15°
B. greater than 8°
C. greater than 5°
D. less than 8°
E. less than 3°.

48. In axial flow fans and turbines, fluid enters and leaves as follows________________?

A. radially, axially
B. axially, radially
C. axially, axially
D. radially, radially
E. combination of axial and radial

49. Air vessels in reciprocating pump are used to__________________?

A. smoothen flow
B. reduce acceleration to minimum
C. increase pump efficiency
D. save pump from cavitation
E. increase pump head

50. According to fan laws, at constant speed and capacity, the pressure and power vary_____________________?

A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density