Multiple Choice Questions (MCQ) on Hydraulic turbines

Multiple Choice Questions (MCQ) on Hydraulic turbines

 

A hydraulic turbine converts the potential energy of water into

  1. Kinetic energy
  2. Heat energy
  3. Thermal energy
  4. Gravitational energy

(Ans:a)

 

Impulse turbine requires

  1. High head and low discharge
  2. High head and high discharge
  3. Low head and low discharge
  4. Low head and high discharge

(Ans:a)

 

Reaction turbine requires

  1. High head and low discharge
  2. High head and high discharge
  3. Low head and low discharge
  4. Low head and high discharge

(Ans:d)

 

Which of the following is an impulse turbine?

  1. Pelton turbine
  2. Francis turbine
  3. Kaplan turbine
  4. Propeller turbine

(Ans:a)

 

Pelton turbine is ______

  1. Tangential flow
  2. Radial flow
  3. Axial flow
  4. Mixed flow

(Ans:a)

 

Kaplan turbine is ______

  1. Tangential flow
  2. Radial flow
  3. Axial flow
  4. Mixed flow

(Ans:b)

 

Francis turbine is ______

  1. Tangential flow
  2. Radial flow
  3. Axial flow
  4. Mixed flow

(Ans:d)

 

If the blades of the axial flow turbine are fixed, these are called

  1. Kaplan turbine
  2. Propeller turbine
  3. Francis turbine
  4. Pelton turbine

(Ans:b)

 

In mixed flow turbines, the water enters the blades ____ and comes out _____

  1. radially, axially
  2. radially, radially
  3. axially, radially
  4. axially, axially

(Ans:a)

 

The specific speed of a turbine is

  1. N√P / H^1/4
  2. N√P / H^3/4
  3. N√P / H^5/4
  4. N√P / H^7/4

Where N = Normal working speed (r.p.m.), P = Power output, H=Net head (in metres)

(Ans:c)

 

In reaction turbines, the runner utilizes

  1. Kinetic energy
  2. Potential energy
  3. Both kinetic energy and potential energy
  4. None of the above

(Ans:c)

 

The function of draft tube is to

  1. increase the pressure of the exiting fluid
  2. increase the Kinetic energy of exiting fluid
  3. allow the turbine to be set below tail water level
  4. keep pressure at runner outlet above the atmospheric pressure

(Ans:a)

 

Cavitation occurs at

  1. high pressure
  2. low pressure
  3. atmospheric pressure
  4. none of the above

(Ans:a)

 

In cavitation, the material fails

  1. by fatigue
  2. due to creep
  3. due to impact load
  4. due to fracture

(Ans:a)