Turbo Machines Test Questions - Set 4

1)   The basic principle of operation of axial flow compressor is _______that of the centrifugal compressor.

a. same as
b. totally different than
Answer  Explanation 

ANSWER: same as

Explanation:
No explanation is available for this question!


2)   The blade passages in a compressor are ________

a. converging
b. diverging
c. constant
d. unpredictable
Answer  Explanation 

ANSWER: diverging

Explanation:
No explanation is available for this question!


3)   Which component of fluid velocity is responsible for transmission of power through rotodynamic machine?

a. Radial
b. Axial
c. Tangential
d. None of the above
Answer  Explanation 

ANSWER: Tangential

Explanation:
No explanation is available for this question!


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

a. head race
b. tail race
c. gross head
d. net head
Answer  Explanation 

ANSWER: net head

Explanation:
No explanation is available for this question!


5)   Gross head is the difference between __________.

a. head race and tail race
b. head race and net head
c. head race and friction losses
d. net head and friction losses
Answer  Explanation 

ANSWER: head race and tail race

Explanation:
No explanation is available for this question!


6)   What is runaway speed of the runner of Pelton wheel?

a. maximum unsafe speed of the runner due to sudden increase in load on turbine
b. minimum safe speed of the runner due to sudden increase in load on turbine
c. maximum unsafe speed of the runner due to sudden decrease in load on turbine
d. minimum safe speed of the runner due to sudden decrease in load on turbine
Answer  Explanation 

ANSWER: maximum unsafe speed of the runner due to sudden decrease in load on turbine

Explanation:
No explanation is available for this question!


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

a. guide gates
b. guide vanes
c. scrolling gates
d. scrolling vanes
Answer  Explanation 

ANSWER: guide vanes

Explanation:
No explanation is available for this question!


8)   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?

a. Scroll casing
b. Guide vanes
c. Moving vanes
d. Draft tube
Answer  Explanation 

ANSWER: Draft tube

Explanation:
No explanation is available for this question!


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

a. impulse momentum
b. angular momentum
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: angular momentum

Explanation:
No explanation is available for this question!


10)   In which type of turbine, the runner needs to be run full of water?

a. Impulse turbine
b. Reaction turbine
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Reaction turbine

Explanation:
No explanation is available for this question!