21 .
Molten soap mass is transported by a __________ pump.

A. | diaphragm | B. | reciprocating |

C. | gear | D. | centrifugal |

22 .
Which of the following denotes the effect of compressibility in fluid flow ?

A. | Weber number |

B. | Mach number |

C. | Euler number |

D. | Reynolds number |

23 .
Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.

A. | smaller than |
B. | larger than |

C. | same as |
D. | twice |

24 .
The terminal velocity of a small sphere settling in a viscous fluid varies as the

A. | first power of its dimeter. |

B. | inverse of the fluid viscosity. |

C. | inverse square of the diameter. |

D. | square of the difference in specific weights of solid & fluid. |

25 .
If the discharge of a centrifugal pump is throttled, then its suction lift

A. | increases |

B. | decreases |

C. | remains unchanged |

D. | data insufficient to predict |

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