Electrical Engineering MCQs

Page No. 307

The critical pressure ratio of a convergent nozzle is defined as_____________?


athe ratio of outlet pressure to inlet pressure of nozzle


b the ratio of inlet pressure to outlet pressure of nozzle


c the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum


d the ratio of outlet pressure to inlet pressure only when mass flow rate = c



The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?


a0.555


b 0.578


c0.5457


d0.6


View Answer 0.5457

The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?


a0.6


b0.578


c 0.555


d0.5457


View Answer 0.578

The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?


apvls=C


b pv1126 = C


cpv1A = C


dpv = C


View Answer pvls=C

The efficiency of chimney is approximately______________?


a 80%


b 40%


c20%


d 0.25%


View Answer 0.25%

The pressure at the furnace is minimum in case of___________?


a forced draught system


b induced draught system


cbalanced draught system


dnatural draught system



For the induced draught the fan is located_______________?


anear bottom of chimney


b near bottom of furnace


cat the top of the chimney


danywhere permissible



The artificial draught normally is designed to produce____________?


aless smoke


bmore draught


cless chimney gas temperature


dall of the above


View Answer all of the above

Artificial draught is produced by____________?


aair fans


bsteam jet


cfan or steam jet


dall of the above


View Answer all of the above

For the same draught produced the power of induced draught fan as compared to forced draught fan is___________?


aless


bmore


csame


dnot predictable


View Answer more

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