Fluid Mechanics

51.A pitched-blade turbine draws _________ a straight blade turbine.

1. Less power than
2. More power than
3. Same power as
4. Data insufficient to predict

View answer

52.A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is

1. 5
2. 14.1
3. 56.22
4. 28.2

View answer

53.A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be

1. 100
2. 200
3. 320
4. 160

View answer

54.A pressure of 10 m head of water is equivalent to _________ kN/m².

1. 98
2. 147
3. 196
4. 49

View answer

55.A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by

1. Decreasing the size of the inlet pipe
2. Increasing the size of the inlet pipe
3. Lowering the pump position
4. Both (B) and (C)

View answer

56.A rectangular surface 3' × 4', has the lower 3 edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water)

1. 39.6y
2. 48y
3. 49.2y
4. 58y

View answer

57.A relief valve

1. Provides back pressure for a cylinder
2. Unloads a pump
3. Is a directional control valve
4. None of these

View answer

58.A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is

1. 26
2. 42
3. 269
4. 325

View answer

59.A Rotameter works on the principle of _________ pressure drop.

1. Constant
2. Variable
3. Both (A) & (B)
4. Neither (A) nor (B)

View answer

60.A special type of liquid transporting device is the diffuser pump, in which _________ are minimised.

1. Bearing losses
2. Disk friction
3. Shock losses
4. Cavitation

View answer