steam boilers engines nozzles and turbines MCQs – Page 10

Practise focused steam boilers engines nozzles and turbines questions with marked answers for exam preparation and subject revision.

steam boilers engines nozzles and turbines Mcqs
181. Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?
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A. economical

B. optional

C. desirable

D. uneconomical

E. essential

182. The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?
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A. first decreases and then increases

B. remains unaffected

C. first increases and then decreases

D. decreases

E. increases

183. A fusible plug is fitted in small boilers in order to ___________________?
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A. extinguish fire if water level in the boiler falls below alarming limit

B. control steam dome

C. avoid explosion

D. remove molten aslj

E. avoid excessive build up of pressure

184. Boiler stays are used to___________________?
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A. provide foundation of boiler

B. provide support for boiler

C. take care of failure in compression

D. take care of failure in shear

E. prevent flat surfaces under pressure from tearing apart
185. The difference between cornish boiler and lancashire boiler is that_________________?
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A. former is fire tube type and latter is water tube type boiler

B. former is water tube type and latter is fire tube type

C. former contains one fire tube and latter contains two fire tubes

D. none/of the above

186. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by___________________?
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A. none of the above

B. bucket calorimeter

C. throttling calorimeter

D. separating calorimeter

E. combined separating and throttling calorimeter

187. Steam exhaust from high pressure turbine is reheated in _____________________?
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A. a separate coil located in convection path

B. economiser

C. boiler drum

D. superheater tubes

E. a separate coil

188. Pour point of fuel oil is the____________________?
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A. storage temperature

B. lowest temperature at which oil will flow under set condition

C. temperature at which fuel is pumped through burners

D. none of the above

E. temperature at which oil is transported

189. In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
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A. may improve/worsen depending on size

B. improve C. worsen

C. unpredictable

D. remain unaffected

190. Proximate analysis of fuel is determination of percentage of ____________________?
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A. carbon, hydrogen, nitrogen, sulphur, moisture

B. higher calorific value

C. fixed carbon, ash, volatile matter, moisture

D. rough analysis

E. lower calorific value

191. Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?
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A. former is used for high installed capacity

B. former generates steam at high pressure

C. former occupies less space for same power

D. rate of steam flow is more in former case

E. chances of explosion are less in former case
192. Fire tube boilers are limited to a maximum design working pressure of ____________________?
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A. 250 kg/cm2

B. 17 kg/cm2

C. 1 kg/cm

D. 6 kg/cm

E. 100 kg/cm2

193. The safety valve on boiler drum compared to safety valve on super heater is set at ________________?
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A. same value

B. lower value

C. lower/higher depending on steam flow

D. higher value

E. unpredicatble

194. 02 content in atmospheric air on volume basis is___________________?
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A. 70%

B. 23%

C. 30%

D. 40%

E. 21%