Electrical Engineering MCQs

Page No. 305

The cooling section in the surface condenser__________?


aincreases the quantity of vapour extracted along with air


breduces the quantity of vapour extracted along with air


cdoes not affect vapour quantity extracted but reduces pump capacity of air extraction pump


dnone of the above



In a surface condenser if air is removed, there is___________?


a fall in absolute pressure maintained in condenser


brise in absolute pressure maintained in condenser


c no change in absolute pressure in the condenser


d rise in temperature of condensed steam



In a shell and tube surface condenser____________?


asteam and cooling water mix to give the condensate


bcooling water passes through the tubes and steam surrounds them


csteam passes through the cooling tubes and cooling water surrounds them


dall of the above varying with situation



In jet type condensers___________?


acooling water passes through tubes and steam surrounds them


bsteam passes through tubes and cooling water surrounds them


csteam and cooling water mix


dsteam and cooling water do not mix



The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?


ahigher


blower


csame as long as initial pressure and temperature is unchanged


d none of the above


View Answer higher

In steam turbines the reheat factor_____________?


aincreases with the increase in number of stages


bdecreases with the increase in number of stages


c remains same irrespective of number of stages


d none of the above



Steam turbines are governed by the following methods_____________?


a Throttle governing


bNozzle control governing


cBy-pass governing


dall of the above


View Answer all of the above

The value of reheat factor normally varies from___________?


a 0.5 to 0.6


b0.9 to 0.950


c1.02 to 1.06


d 1.2 to 1.6


View Answer 1.02 to 1.06

Reheat factor in steam turbines depends on______________?


aexit pressure only


bstage efficiency only


cinitial pressures and temperature only


dall of the above



For Parson’s reaction steam turbine, degree of reaction is____________?


a 75%


b100%


c 50%


d 60%


View Answer 50%

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