Mechanical Engineering - Power Engineering - Power Engineering

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Question - 1

In an impulse turbine

  • A the entire kinetic energy is converted to pressure energy at the inlet to the turbine
  • B part of the kinetic energy is converted to pressure energy
  • C no part of pressure energy is converted to KE in the inlet
  • D the entire pressure energy is converted to velocity energy

Question - 2

In an inward flow reaction turbine, which of the following statements is correct?

  • A Water enters the outer periphery and moves radially inwards
  • B As speed increases, discharge increases
  • C Centrifugal head increases from inlet to outle
  • D All of the above

Question - 3

The function of guide vanes in a reaction turbine is

  • A to ensure shock less entry of water
  • B control flow rate of water on to the runner
  • C to guide the water at correct angle on to runner blades
  • D All of the above

Question - 4

Draft tube is fitted with the following purpose

  • A recover part of KE of water
  • B control the flow rate of water
  • C to guide water out of turbine
  • D avoid splashing of water

Question - 5

A pump converts

  • A mechanical energy to pressure energy
  • B pressure head to velocity head
  • C velocity head to pressure head
  • D Non- of the above

Question - 6

Cavitation occurs in centrifugal pumps due to

  • A very low suction pressure
  • B very high impeller speed
  • C Both (a) and (b)
  • D low discharge

Question - 7

Manometric head of a pump means

  • A total lift from pump centre line to the upper level of water
  • B head difference between two arms of a manometer connected between the suction and delivery
  • C pressure measured by a manometer at any point on the pump
  • D manometric. pressure of the pump casing

Question - 8

In order to avoid cavitation

  • A (NPSH)required< (NPSH)available
  • B (NPSH)required>(NPSH)available
  • C (NPSH)required = (NPSH)available
  • D None of the above

Question - 9

A jet of water with velocity of 10 m/s strikes to a plate as shown in figure. Diameter of jet is 25 mm.

Then force required to apply at lower edge of plate to keep it vertical is

  • A 28.7 N
  • B 49.09 N
  • C 24.5 N
  • D zero

Question - 10

A jet of water with velocity of 10 m/s strikes to a plate as shown in figure . Diameter of jet is 25 mm.
 
If P = 0, and Wplate= 10 g, then angle upto which plate swings freely

  • A 60°
  • B 90°
  • C 30°
  • D 45°
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