Electrical Engineering MCQs

Page No. 305

The cooling section in the surface condenser__________?


aincreases the quantity of vapour extracted along with air

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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

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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

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c no change in absolute pressure in the condenser

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d rise in temperature of condensed steam

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In a shell and tube surface condenser____________?


asteam and cooling water mix to give the condensate

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bcooling water passes through the tubes and steam surrounds them

✓


csteam passes through the cooling tubes and cooling water surrounds them

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dall of the above varying with situation

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In jet type condensers___________?


acooling water passes through tubes and steam surrounds them

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bsteam passes through tubes and cooling water surrounds them

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csteam and cooling water mix

✓


dsteam and cooling water do not mix

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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

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d none of the above

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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

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c remains same irrespective of number of stages

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d none of the above

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Steam turbines are governed by the following methods_____________?


a Throttle governing

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bNozzle control governing

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cBy-pass governing

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dall of the above

✓


View Answer all of the above

The value of reheat factor normally varies from___________?


a 0.5 to 0.6

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b0.9 to 0.950

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c1.02 to 1.06

✓


d 1.2 to 1.6

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View Answer 1.02 to 1.06

Reheat factor in steam turbines depends on______________?


aexit pressure only

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bstage efficiency only

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cinitial pressures and temperature only

✓


dall of the above

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


a 75%

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b100%

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c 50%

✓


d 60%

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View Answer 50%

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