Exam preparation MCQs with answers

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Runaway speed of a hydraulic turbine is_________________?
  • (A)  full load speed
  • (B)  the speed at which turbine runner will be damaged
  • (C)  the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
  • (D)  the speed corresponding to maximum overload permissible
  • (E)  none of the above.
In reaction turbine, draft tube is used_____________________?
  • (A)  to transport water downstream without eddies
  • (B)  to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
  • (C)  for safety of turbine
  • (D)  to increase flow rate
  • (E)  none of the above
Isotopes of same elements have___________________?
  • (A)  same atomic number and different masses
  • (B)  same chemical properties but different atomic numbers
  • (C)  different masses and different atomic numbers
  • (D)  different chemical properties and same atomic numbers
  • (E)  same chemical properties and same atomic numbers