Fluid Mechanics

71.Acceleration head in a reciprocating pump

1. Increases the work done during delivery stroke
2. Decreases the work done during suction stroke
3. Does not change the work requirement of the pump
4. Increases the work done during suction stroke

View answer

72.Actual lift of a pump is always less than the theoretical lift and is limited by the

1. Specific gravity & temperature of the liquid
2. Leakage & pressure decreasing at higher elevations
3. Frictional resistance through pipes, fittings & passages
4. All (A), (B) and (C)

View answer

73.Air vessel fitted to a reciprocating pump

1. Increases the work done
2. Decreases the work done
3. Causes cavitation
4. Results in non-uniform discharge

View answer

74.Air vessel of a reciprocating pump is initially filled with

1. Atmospheric air
2. Compressed air
3. Water
4. None of these

View answer

75.Air vessel provided in a reciprocating pump

1. Smoothens the flow by avoiding pulsations
2. Increases the volumetric efficiency of the pump
3. Saves the pump from the danger of cavitation
4. None of these

View answer

76.Air vessel provided in a reciprocating pump is for

1. Increasing the acceleration head
2. Making the friction in pipe uniform
3. Decreasing the acceleration head
4. None of these

View answer

77.All pipes of a particular nominal size have the same

1. Inside diameter
2. Outside diameter
3. Thickness
4. None of these

View answer

78.An equipotential line is _________ to the velocity vector at every point.

1. Normal
2. Parallel
3. Tangential
4. None of these

View answer

79.An ideal fluid is

1. Frictionless & incompressible
2. One, which obeys Newton's law of viscosity
3. Highly viscous
4. None of these

View answer

80.An ideal nozzle design aims at

1. Minimising wall friction
2. Suppressing boundary layer separation
3. Both (A) & (B)
4. Neither (A) nor (B)

View answer