Electrical Engineering MCQs

Page No. 306

Parson’s turbine is___________?


a pressure compounded steam turbine

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bsimple single wheel, impulse steam turbine

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csimple single wheel reaction steam turbine

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dmulti wheel reaction steam turbine

✓



Rateau steam turbine is______________?


aRateau steam turbine is______________?

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bvelocity compounded impulse steam turbine

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cpressure compounded impulse steam turbine

✓


dpressure velocity compounded steam turbine

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Curtis turbine is_____________?


areaction steam turbine

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bpressure velocity compounded steam turbine

✓


cpressure compounded impulse steam turbine

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dpressure compounded impulse steam turbine

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Incase of reaction steam turbine___________?


athere is enthalpy drop both in fixed and moving blades

✓


bthere is enthalpy drop only in fixed blades

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cthere is enthalpy drop only in moving blades

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dnone of the above

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In De Laval steam turbine___________?


athe pressure in the turbine rotor is approximately same as in con¬denser

✓


b the pressure in the turbine rotor is higher than pressure in the con¬denser

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cthe pressure in the turbine rotor gradually decreases from inlet to exit from condenser

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d none from the above

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The pressure on the two sides of the impulse wheel of a steam turbine_____?


ais same

✓


b is different

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c increases from one side to the other side

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ddecreases from one side to the other side

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View Answer is same

In case of impulse steam turbine_____________?


athere is enthalpy drop in fixed and moving blades

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b there is enthalpy drop only in moving blades

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cthere is enthalpy drop in nozzles

✓


dnone of the above

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The effect of considering friction in steam nozzles for the same pressure ratio leads to_________?


aincrease in dryness fraction of exit steam

✓


b decrease in dryness fraction of exit steam

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cno change in the quality of exit steam

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ddecrease or increase of dryness fraction of exit steam depending upon inlet quality

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The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?


aincrease in exit velocity from the nozzle

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bdecrease in exit velocity from the nozzle

✓


cno change in exit velocity from the nozzle

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dincrease or decrease depending upon the exit quality of steam

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The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation?


apv = C

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bpv1A = C

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cpv1i = C

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dpv

✓


View Answer pv

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