Kaplan, Francis and Deriaz Turbines MCQ

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• Which of the following turbine is preferred for 0 to 25 m head of water?
  ক

  Kaplan Turbine

  খ

  Pelton Turbine

  গ

  Francis Turbine

  ঘ

  None of the mentioned
• Discharge of a centrifugal pump is __________
  ক

  inversely proportional to (diameter)2 of its impeller

  খ

  inversely proportional to diameter of its impeller

  গ

  directly proportional to (diameter)2 of its impeller

  ঘ

  directly proportional to diameter of its impeller
• A hydraulic coupling belongs to the category of __________
  ক

  power absorbing machines

  খ

  energy transfer machines

  গ

  power developing machines

  ঘ

  energy generating machines
• Multi-stage centrifugal pumps are used to __________
  ক

  produce high heads

  খ

  give high discharge

  গ

  pump viscous fluids

  ঘ

  all of the mentioned
• Slip of a reciprocating pump is defined as the __________
  ক

  sum of actual discharge and the theoretical discharge

  খ

  ratio of actual discharge to the theoretical discharge

  গ

  difference of theoretical discharge and the actual discharge

  ঘ

  product of theoretical discharge and the actual discharge
• A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the __________
  ক

  manometric head

  খ

  velocity head

  গ

  kinetic head

  ঘ

  static head
• Geometric similarity is said to exist between the model and the prototype if both of them __________
  ক

  are equal in size and shape

  খ

  have identical velocities

  গ

  have identical forces

  ঘ

  are identical in shape, but differ only in size
• The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as?
  ক

  unit speed

  খ

  terrific speed

  গ

  specific velocity

  ঘ

  specific speed
• What is the mechanical efficiency of an impulse turbine?
  ক

  ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

  খ

  ratio of the actual work available at the turbine to the energy imparted to the wheel

  গ

  ratio of the Work done on the wheel to the energy of the jet

  ঘ

  none of the mentioned
• Manometric head, in case of a centrifugal pump, is equal to __________
  ক

  Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe

  খ

  Energy per kN at outlet of impeller – Energy per kN at inlet of impeller

  গ

  Workdone per kN of water – Losses within the impeller

  ঘ

  All of the mentioned
• The overall efficiency of a reaction turbine is the ratio of __________
  ক

  actual work available at the turbine to the energy imparted to the wheel

  খ

  power produced by the turbine to the energy actually supplied by the turbine

  গ

  workdone on the wheel to the energy (or head of water) actually supplied to the turbine

  ঘ

  none of the mentioned
• A Francis turbine is used when the available head of water is?
  ক

  0 to 25 m

  খ

  25 to 250 m

  গ

  > 250 m

  ঘ

  none of the mentioned
• The maximum number of jets, generally, employed in an impulse turbine without jet interference are __________
  ক

  2

  খ

  6

  গ

  7

  ঘ

  5
• The cups at the periphery of the Pelton wheel are __________
  ক

  equiangular

  খ

  equidistant

  গ

  equimolar

  ঘ

  none of the mentioned
• A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is?
  ক

  0.26

  খ

  0.36

  গ

  0.46

  ঘ

  0.56
• By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is?
  ক

  84.8%

  খ

  74.8%

  গ

  64.8%

  ঘ

  54.8%
• The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, will be?
  ক

  40%

  খ

  50%

  গ

  60%

  ঘ

  80%
• Which of the following pump is generally used to pump highly viscous fluid?
  ক

  Air lift pump

  খ

  Centrifugal pump

  গ

  Screw pump

  ঘ

  Reciprocating pump
• The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as?
  ক

  overall efficiency

  খ

  volumetric efficiency

  গ

  manometric efficiency

  ঘ

  mechanical efficiency
• In a reciprocating pump, air vessels are used to __________
  ক

  increase delivery head

  খ

  reduce suction head

  গ

  smoothen the flow

  ঘ

  reduce acceleration head
• If the ratios of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have __________
  ক

  kinematic similarity

  খ

  geometric similarity

  গ

  dynamic similarity

  ঘ

  none of the mentioned
• The hydraulic efficiency of a reaction turbine is the ratio of __________
  ক

  actual work available at the turbine to energy imparted to the wheel

  খ

  power produced by the turbine to the energy actually supplied by the turbine

  গ

  work done on the wheel to the energy actually supplied to the turbine

  ঘ

  none of the mentioned
• In a Francis turbine runner, the number of blades are generally between __________
  ক

  2 to 4

  খ

  8 to 16

  গ

  4 to 8

  ঘ

  16 to 24
• The impeller of a centrifugal pump may have __________
  ক

  vortex casing

  খ

  volute casing

  গ

  volute casing with guide blades

  ঘ

  any of the mentioned
• Kinematic similarity is said to exist between the model and the prototype, if both of them __________
  ক

  are equal in size and shape

  খ

  have identical velocities

  গ

  are identical in shape, but differ only in size

  ঘ

  have identical forces