11 .
The normal stress is the same in all directions at a point in a fluid, when the fluid is

A. | non-viscous. |

B. | incompressible |

C. | both (a) and (b). |

D. | having no motion of one fluid layer relative to the other. |

12 .
Head developed by a centrifugal pump depends on its

A. | speed |

B. | impeller diameter |

C. | both (a) and (b) |

D. | neither (a) nor (b) |

13 .
Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum

A. | flow rate |

B. | mean velocity |

C. | both 'a' & 'b' |

D. | neither 'a' nor 'b' |

14 .
The head loss in turbulent flow in a pipe varies

A. | as velocity |

B. | as (velocity)2 |

C. | inversely as the square of diameter |

D. | inversely as the velocity |

15 .
Most commonly used joint in the underground pipe lines is the

A. | sleevejoint |

B. | coupling |

C. | flange |

D. | expansion joint |

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