Steam Nozzles and Turbines MCQ with Answers

1) A nozzle is said to be a convergent nozzle

Answer is:

when the cross-section of the nozzle decreases continuously from entrance to exit

Explanation:

.

2) A turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion.

Answer is:

90 Degree

3) The flow through a nozzle is regarded as

Answer is:

isentropic flow

4) The ratio of total useful heat drop to the total isentropic heat drop, is called

Answer is:

internal efficiency

Explanation:

Due to reheat factor, the efficiency of the turbine as a whole is greater than the efficiency of individual stages. The efficiency of a complete turbine is known as internal efficiency or efficiency ratio of a turbine.. Internal efficiency is defined as the ratio of total useful heat drop to the total isentropic heat drop.

5) The pressure at which the steam leaves the nozzle is known as back pressure.

Answer is:

1) A nozzle is said to be a convergent nozzle

when the cross-section of the nozzle decreases continuously from entrance to exit

2) A turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion.

90 Degree

3) The flow through a nozzle is regarded as

isentropic flow

4) The ratio of total useful heat drop to the total isentropic heat drop, is called

internal efficiency

5) The pressure at which the steam leaves the nozzle is known as back pressure.

Correct