Turbo Machines Test Questions

MCQ: The basic principle of operation of axial flow compressor is _______that of the centrifugal compressor.

1. same as
2. totally different than

MCQ: The blade passages in a compressor are ________

1. converging
2. diverging
3. constant
4. unpredictable

MCQ: Which component of fluid velocity is responsible for transmission of power through rotodynamic machine?

1. Radial
2. Axial
3. Tangential
4. None of the above

MCQ: What is the head of water available at turbine inlet in hydro-electric power plant called?

1. head race
2. tail race
3. gross head
4. net head

MCQ: Gross head is the difference between __________.

1. head race and tail race
2. head race and net head
3. head race and friction losses
4. net head and friction losses

MCQ: What is runaway speed of the runner of Pelton wheel?

1. maximum unsafe speed of the runner due to sudden increase in load on turbine
2. minimum safe speed of the runner due to sudden increase in load on turbine
3. maximum unsafe speed of the runner due to sudden decrease in load on turbine
4. minimum safe speed of the runner due to sudden decrease in load on turbine

MCQ: The gates of aerofoil section in between the outer and inner ring of guide wheel are called as ________.

1. guide gates
2. guide vanes
3. scrolling gates
4. scrolling vanes

MCQ: Which of the following components of reaction turbine increases the head on the turbine by an amount equal to the height of runner outlet above the tail race?

1. Scroll casing
2. Guide vanes
3. Moving vanes
4. Draft tube

MCQ: As the reaction turbine works on the principle of impulse and reaction, it follows the law of ________.

1. impulse momentum
2. angular momentum
3. both a. and b.
4. none of the above

MCQ: In which type of turbine, the runner needs to be run full of water?

1. Impulse turbine
2. Reaction turbine
3. Both a. and b.
4. None of the above