Steam Boilers, Engines, Nozzles And Turbines MCQ Questions & Answers

21

In accelerated circulation type boiler

A) Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum B) Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam C) Feed pump is employed to supplement natural circulation in water wall type furnace D) Water is converted into steam in one pass without any recirculation

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Answer & Solution

Answer: Option B

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22

In forced circulation type boiler

A) Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum B) Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam C) Feed pump is employed to supplement natural circulation in water wall type furnace D) Water is converted into steam in one pass without any recirculation

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Answer & Solution

Answer: Option D

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23

The critical pressure ratio for initially dry saturated steam is

A) 0.546 B) 0.577 C) 0.582 D) 0.601

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Answer & Solution

Answer: Option B

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24

Heating of dry steam above saturation temperature is known as

A) Enthalpy B) Superheating C) Super saturation D) Latent heat

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Answer & Solution

Answer: Option B

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25

The chimney draught varies with

A) Climatic conditions B) Temperature of furnace gases C) Height of chimney D) All of these

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Answer & Solution

Answer: Option D

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26

De-Laval turbine is a

A) Simple impulse turbine B) Simple reaction turbine C) Impulse-reaction turbine D) None of these

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Answer & Solution

Answer: Option A

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27

The efficiency of steam turbines may be improved by

A) Reheating of steam B) Regenerative feed heating C) Binary vapor plant D) Any one of these

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Answer & Solution

Answer: Option D

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28

Incomplete combustion can be best judged by

A) Smoky chimney exit B) Excess air in flue gases C) Measuring carbon monoxide in flue gases D) Measuring temperature of flue gases at exit of furnace

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Answer & Solution

Answer: Option C

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29

Green coal, in order to be burnt, must be

A) Heated sufficiently B) Burnt in excess air C) Heated to its ignition point D) Burnt as powder

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Answer & Solution

Answer: Option C

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30

The ratio of the workdone on the blades to the energy supplied to the blades, is called

A) Blading efficiency B) Nozzle efficiency C) Gross or stage efficiency D) Mechanical efficiency

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Answer & Solution

Answer: Option A

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Steam Boilers, Engines, Nozzles And Turbines MCQ Questions & Answers | Mechanical Engineering