Q.1
What is the mechanical efficiency of an impulse turbine?
  • a) ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
  • b) ratio of the actual work available at the turbine to the energy imparted to the wheel
  • c) ratio of the Work done on the wheel to the energy of the jet
  • d) none of the mentioned
Q.2
The maximum number of jets, generally, employed in an impulse turbine without jet interference are __________
  • a) 2
  • b) 6
  • c) 7
  • d) 5
Q.3
A Francis turbine is used when the available head of water is?
  • a) 0 to 25 m
  • b) 25 to 250 m
  • c) > 250 m
  • d) none of the mentioned
Q.4
The overall efficiency of a reaction turbine is the ratio of __________
  • a) actual work available at the turbine to the energy imparted to the wheel
  • b) power produced by the turbine to the energy actually supplied by the turbine
  • c) workdone on the wheel to the energy (or head of water) actually supplied to the turbine
  • d) none of the mentioned
Q.5
Manometric head, in case of a centrifugal pump, is equal to __________
  • a) 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
  • b) Energy per kN at outlet of impeller – Energy per kN at inlet of impeller
  • c) Workdone per kN of water – Losses within the impeller
  • d) All of the mentioned
Q.6
The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as?
  • a) unit speed
  • b) terrific speed
  • c) specific velocity
  • d) specific speed
Q.7
Geometric similarity is said to exist between the model and the prototype if both of them __________
  • a) are equal in size and shape
  • b) have identical velocities
  • c) have identical forces
  • d) are identical in shape, but differ only in size
Q.8
A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the __________
  • a) manometric head
  • b) velocity head
  • c) kinetic head
  • d) static head
Q.9
Slip of a reciprocating pump is defined as the __________
  • a) sum of actual discharge and the theoretical discharge
  • b) ratio of actual discharge to the theoretical discharge
  • c) difference of theoretical discharge and the actual discharge
  • d) product of theoretical discharge and the actual discharge
Q.10
Multi-stage centrifugal pumps are used to __________
  • a) produce high heads
  • b) give high discharge
  • c) pump viscous fluids
  • d) all of the mentioned
Q.11
A hydraulic coupling belongs to the category of __________
  • a) power absorbing machines
  • b) energy transfer machines
  • c) power developing machines
  • d) energy generating machines
Q.12
Discharge of a centrifugal pump is __________
  • a) inversely proportional to (diameter)2 of its impeller
  • b) inversely proportional to diameter of its impeller
  • c) directly proportional to (diameter)2 of its impeller
  • d) directly proportional to diameter of its impeller
Q.13
Which of the following turbine is preferred for 0 tom head of water?
  • a) Kaplan Turbine
  • b) Pelton Turbine
  • c) Francis Turbine
  • d) None of the mentioned
0 h : 0 m : 1 s