Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 2

41. 

In order to reduce the rotor speed of an impulse turbine, the method employed is

A. velocity compounding
B. pressure compounding
C. pressure-velocity compounding
D. all of these

Answer: Option D

Explanation:

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42. 

The nozzle efficiency is the ratio of

A. workdone on the blades to the energy supplied to the blades
B. workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
C. energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
D. none of the above

Answer: Option C

Explanation:

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43. 

The friction in the nozzle __________ exit velocity of steam.

A. has no effect on
B. decreases
C. increases

Answer: Option B

Explanation:

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44. 

In a reaction turbine

A. the steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
B. the expansion of steam takes place partly in the fixed blades and partly in the moving blades
C. the steam is expanded from a high pressure to a condenser pressure in one or more nozzles
D. the pressure and temperature of steam remains constant

Answer: Option B

Explanation:

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45. 

A stage, in reaction turbine, is represented by

A. number of casing
B. number of entries of steam
C. number of exits of steam
D. each row of blades

Answer: Option D

Explanation:

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