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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