Fluid Mechanics and Hydraulic Machines Mid - II, November - 2014

1.The science which deal with depletion and replenishment of water resources is known as
  • Power plant engineering
  • Hydrology
  • Fluid Mechanics
  • Hydraulic Machines
Answer: B
2.The Run-off can be measured by
  • Rainfall records
  • Empirical formulae
  • Discharge observation method
  • All of these
Answer: D
3.The curve which can be used to determine storage requirement that is needed to produce a certain dependable flow from fluctuating discharge of a river by reservoir is
  • Mass curve
  • Discharge curve
  • Flow curve
  • None of these
Answer: A
4.In a Kaplan turbine runner, the number of blades are generally between
  • 2 to 4
  • 4 to 8
  • 8 to 16
  • 16 to 20
Answer: B
5.The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________________ efficiency
  • Hydraulic
  • Mechanical
  • Overall
  • None of these
Answer: B
6.Geometric similarity is said to exist between the model and prototype, if both of them
  • have identical velocities
  • are equal in size and shape
  • are identical in shape, but differ only in size
  • have identical forces
Answer: C
7.The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head is known as
  • normal speed
  • unit speed
  • specific speed
  • none of these
Answer: C
8.Cavitation is caused by
  • high velocity
  • high pressure
  • low pressure
  • low viscosity
Answer: C
9.Power required to drive a centrifugal pump is directly proportional to
  • diameter
  • square of diameter
  • cube of diameter
  • fourth power of diameter
Answer: D
10.Discharge of a centrifugal pump is
  • directly proportional to diameter of its impeller
  • inversely proportional to diameter of its impeller
  • directly proportional to square of diameter of its impeller
  • inversely proportional to square of diameter of its impeller
Answer: D
11.Running cost of a hydro plant with respect to that of thermal plant is ___________________.
Answer: Less
12.A ________________ is a barrier to confine or rise water for storage or diversion to create a hydraulic head.
Answer: Dam
13.The power produced by the reaction turbine is ______________ to the head of water.
Answer: Directly proportional
14.The efficiency of a pelton wheel working under constant head __________________ with increase in power.
Answer: Increases
15._______________ turbine is preferred for 0 to 25m head of water.
Answer: Kaplan turbine
16.________________________________ surge tank is also called as throttled surge tank.
Answer: Restricted orifice
17.A __________________ is a small reservoir or tank in which the water level rises or falls to reduce the pressure swings, so that they are not transmitted in full to a closed circuit.
Answer: Surge tank
18.When the speed of pump increases, its net positive suction head (NPSH) requirement ______________.
Answer: Increases
19.In the casing of a centrifugal pump, the kinetic energy of the water is converted into ____________________ before the water leaves the casing.
Answer: Pressure energy
20.In a reciprocating pump, _________________ are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.
Answer: Pressure vessel