Mechanical Engineering MCQs

Page No. 9

Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?


adesirable


beconomical


cessential


duneconomical


View Answer uneconomical

Steam exhaust from high pressure turbine is reheated in _____________________?


aboiler drum


bsuperheater tubes


ceconomiser


da separate coil located in convection path



The safety valve at superheater as compared to drum safety valve setting is set at___________________?


ahigher value


blower value


csame value


dany value


View Answer lower value

The pressure of reheat steam after passing through reheater compared to inlet condition is _________________?


amore


bless


cequal


dmay be more or less depending on capacity of reheater


View Answer less

In regenerative air preheater, the heat is transferred _____________________?


afrom a metal wall from one medium to another


bfrom heating an intermediateanaterial and then heating the air from this material


cby direct mixing


dheat is transferred by bleeding some gas from furnace



A safety valve in a locomotive starts leaking. The leaking medium will be_________________?


awater


bdry steam


cwet steam


dsuper heated steam


View Answer super heated steam

The diameter of fire tubes in Cochran boiler is of the order of___________________?


a2 cm


b6 Cm ,


c8 cm


d12 cm


View Answer 6 Cm ,

With increase in load, radiant super heater has____________________?


adrooping characteristic


blihear characterisstic


crising characteristic


dflat characteristic



The major axis of elliptical manholes on the shell should be provided___________________?


alongitudinally


bcircumferentially


con dished end


danywhere


View Answer circumferentially

Size of boiler tubes is specified by___________________?


amean diameter and thickness


binside diameter and thickness


coutside diameter and thickness


doutside diameter and inside diameter



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