Steam & Gas Turbines Mcqs

Q:

________ takes place due to thermal stresses in the steam turbine cylinder.

A) Expansion B) Compression
C) Depends D) None of the mentioned
 
Answer & Explanation Answer: A) Expansion

Explanation: Expansion takes place due to thermal stresses in the steam turbine cylinder. As steam turbine cylinders are made of some metal, thermal expansion may take place.

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22
Q:

Some nozzles are equipped on the ________

A) Reheating B) Rotating shaft
C) Casing D) Cylinders
 
Answer & Explanation Answer: D) Cylinders

Explanation: Some nozzles are equipped on the cylinders, so that intermediate reheating can be done to the working fluid and unwanted gases can be driven out.

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16
Q:

_______ can also be done to the steam in between the cylinders of steam turbine.

A) Reheating B) Regenerating
C) Recuperating D) None of the mentioned
 
Answer & Explanation Answer: A) Reheating

Explanation: Reheating can also be done to the steam in between the cylinders of steam turbine so that pressure compounding will be possible.

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19
Q:

Pressures of the cylinders in steam turbines are arranged according to the specific _______

A) temperature B) pressure
C) volume D) none of the mentioned
 
Answer & Explanation Answer: C) volume

Explanation: As steam moves from one cylinder to another cylinder its pressure keeps on decreasing and specific volume keeps increasing. Hence cylinders are arranged according to the increase of the specific volume of the working fluid.

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22
Q:

All the cylinders used in steam turbine are worked under _______ pressure.

A) same B) increasing pressure
C) decreasing pressure D) none of the mentioned
 
Answer & Explanation Answer: B) increasing pressure

Explanation: Pressure in the steam turbine cylinders is not constant it varies from cylinder to cylinder.The pressure in each cylinder is varied so that pressure compounding can be attained.

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23
Q:

________ cylinder is used in steam turbine.

A) One B) Multiple
C) Either one or multiple depending on the requirement D) None of the mentioned
 
Answer & Explanation Answer: C) Either one or multiple depending on the requirement

Explanation: More than one cylinder are joined together to make steam turbine generator to work.The number of cylinders that are to be used is specified based on the volume required.

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17
Q:

Steam entering cylinder has ______ temperature than the steam present in the cylinder.

A) less B) more
C) equal D) none of the mentioned
 
Answer & Explanation Answer: B) more

Explanation: Steam entering cylinder has more temperature than the steam present in the cylinder as the heat energy from the steam inside the cylinder will be used up.

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18
Q:

Thickness of the cylinder wall must be ________ in steam turbines.

A) constant B) increased
C) decreasing D) none of the mentioned
 
Answer & Explanation Answer: A) constant

Explanation: Thickness of the cylinder wall must be maintained constant in steam turbines because if the thickness is uneven there will be uneven thermal stresses developed.

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