steam boilers engines nozzles and turbines MCQs – Page 6

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

101. The radius of a dished head is taken approximately as______________________?
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A. half

B. three

C. one

D. two

E. one-fourth

102. Incomplete combustion can be best judged by__________________?
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A. measuring oxygen in flue gases

B. measuring temperature of flue gases at exit of furnace

C. smoky chimney exit

D. excess air in flue gases

E. measuring carbon mono-oxide in flue gases

103. The condition of steam in boiler drum is always ___________________?
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A. dry

B. superheated

C. saturated

D. supersaturated

E. wet

104. Presence of moisture in fuel oil would____________________?
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A. clean the nozzles

B. reduce flame length

C. aid in proper combustion

D. cause sputtering, possibly extinguishing flame

E. keep the burner tips cool

105. Vacuum for reciprocating steam engines compared to steam turbines is__________________?
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A. more

B. equal

C. less

D. could be more or less depending on the size of plant

E. none of the above

106. In water wall furnace, the heat is transferred to the water-walls by _________________?
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A. radiation and convection

B. convection

C. radiation

D. conduction

E. radiation and conducton

107. A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?
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A. 218 kg/cm2 abs and 540C

B. 100 kg/cm2 and 540C

C. 1 kg/cm2 and 100C

D. 100 kg/cm2 abs and 373C

E. 218 kg/cm2 abs and 373C

108. The behaviour of coal in a furnace is determained by_______________________?
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A. the proximate analysis

B. the exact analysis

C. its type

D. the content of ash and heating value

E. the content of sulphur

109. The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?
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A. less

B. less or more depending on size of boiler

C. more

D. same

E. unpredictable

110. With increase in load, convection superheater has_______________________?
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A. linear characterisstic

B. none of the above

C. drooping characteristic

D. flat characteristic

E. rising characteristic

111. Fusible plug for boilers is made of fusible metal containing tin, lead, and___________________?
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A. copper

B. aluminium

C. iron

D. nickel

E. bismuth

112. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
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A. remains unchanged

B. increases

C. decreases

D. increases/decreases depending on steam temperature requirements

E. unpredictable

113. Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?
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A. 1 + moisture content

B. (1 + moisture content)

C. (1- moisture content)

D. 1 moisture content

114. Which device is used in thermal power plants to reduce level of pollution___________________?
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A. chimney

B. precipitator

C. induced draft fan

D. smoke meter

E. pulveriser

115. The function of injector used in small capacity boilers is to____________________?
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A. inject chemical solution in feed pump

B. none of the above

C. pump water, similar to boiler feed pump

D. add make up water in the system

E. create vacuum

116. The overall efficiency of thermal power plant is________________?
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A. all the three above plus gas cycle efficiency

B. regenerative cycle efficiency

C. boiler efficiency, turhine efficiecny, generator efficiency

D. rankine cycle efficiency

E. carnot cycle efficiency

117. Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?
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A. high calorific value coal being burnt

B. fouling of heat transfer surfaces

C. raising of steam temperature

D. leakage of air

E. higher effectiveness of boiler

118. The ratio of heat utilised to produce steam and the heat liberated in furnace is known as___________________?
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A. boiler evaporative capacity

B. boiler effectiveness

C. factor of evaporation

D. equivalent evaporation

E. boiler efficiency

119. Feed water conditioning in thermal power plants in done to__________________?
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A. increase *heat transfer rate

B. increase efficiency-of thermal power plant

C. reduce hardness and for removal of solids

D. all of the above

E. increase steam parameters

120. Gusset stays in a boiler are provided to____________________?
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A. avoid explosion in furnace

B. prevent atmospheric air leaking into furnace

C. prevent the bulging of flat surfaces

D. support furnace freely from top

E. prevent leakage of hot flue gases

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