Mechanical Engineering MCQs

Page No. 10

Boiler stays are used to___________________?


aprevent flat surfaces under pressure from tearing apart

✓


btake care of failure in shear

✖


ctake care of failure in compression

✖


dprovide support for boiler

✖



Which type of boiler can meet rapid changes of load____________________?


avertical fire tube type

✖


bhorizontal fire tube type

✖


chorizontal water tube type

✖


dforced circulation type

✓



It is required to produce large amount of steam at low pressure. Which boiler should be used ?


apulverised fuel fired boiler

✖


bcochran boiler

✖


clancashire boiler

✓


dbabcock and wilcox boiler

✖


View Answer lancashire boiler

Steam in water tube boiler as compared to fire tube boiler_________________?


acan be raised rapidly

✓


bis raisd at slower rate

✖


cis raised at same rate

✖


dcould be raised at fast/slow rate depending on design

✖


View Answer can be raised rapidly

In accelerated circulation type boiler________________?


aheating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm

✖


bwater is supplied in drum and through downcomers” located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam

✓


cfeed pump is employed to supplement natural circulation in water wall type furnace

✖


dwater is converted into steam in one pass without any recirculation

✖



In forced recirculation type boiler__________________?


aheating 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

✖


bwater 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

✖


cfeed pump is employed to supplement natural circulation in water wall type furnace

✓


dwater is converted into steam in one pass without any recirculation

✖



Fusible plug for boilers is made of fusible metal containing tin, lead, and___________________?


abismuth

✓


bcopper

✖


caluminium

✖


dnickel

✖


View Answer bismuth

Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?


aformer generates steam at high pressure

✖


bformer occupies less space for same power

✖


crate of steam flow is more in former case

✖


dchances of explosion are less in former case

✓



A fusible plug is fitted in small boilers in order to ___________________?


aavoid excessive build up of pressure

✖


bavoid explosion

✖


cextinguish fire if water level in the boiler falls below alarming limit

✓


dcontrol steam dome

✖



Thermal efficiency of well maintained boiler will be of the order___________________?


a20%

✖


b40%

✖


c50%

✖


d90%

✓


View Answer 90%

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