Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 2

46. 

When the nozzle operates with the maximum mass flow, the nozzle is said to be

A. choked
B. underdamping
C. overdamping
D. none of these

Answer: Option A

Explanation:

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47. 

In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,

A. velocity increases
B. velocity decreases
C. velocity remains constant
D. pressure remains constant

Answer: Option B

Explanation:

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48. 

The ratio of the energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam is called mechanical efficiency.

A. Yes
B. No

Answer: Option B

Explanation:

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49. 

A steam nozzle converts

A. heat energy of steam into kinetic energy
B. kinetic energy into heat energy of steam
C. heat energy of steam into potential energy
D. potential energy into heat energy of steam

Answer: Option A

Explanation:

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50. 

The maximum discharge of steam through a convergent-divergent nozzle depends upon

A. area of nozzle at throat
B. initial pressure and volume of steam
C. final pressure ofsteam leaving the nozzle
D. both (a) and (b)

Answer: Option D

Explanation:

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